JP7579562B2 - Intake and exhaust valves - Google Patents

Description

The present invention relates to an intake and exhaust valve that is attached to the top of a water supply standpipe.

In the water supply systems of buildings and apartment buildings, an intake and exhaust valve is installed at the top of the water supply standpipe. When the water supply pressure drops due to a water outage or other reason, the intake and exhaust valve draws in air from the intake and exhaust port to eliminate the negative pressure inside the standpipe and prevent water from flowing back into the standpipe from the water supply equipment at the end of each unit. In addition, when the standpipe is filled with water, the intake and exhaust valve exhausts air from inside the standpipe by exhausting air from the intake and exhaust port.

Such an intake and exhaust valve is described in Patent Document 1. The intake and exhaust valve in this document comprises a housing with an intake and exhaust port, and a valve chamber partitioned within the housing. An air hole communicating with the intake and exhaust port is provided in the ceiling of the valve chamber, and a communication port communicating with the standpipe is provided in the bottom. A floating valve body and a float valve body are arranged within the valve chamber. The floating valve body can abut from below against the opening edge of the air hole in the ceiling. The floating valve body also has a secondary air hole communicating with the air hole. The secondary air hole passes through the floating valve body in the vertical direction. The float valve body is arranged below the floating valve body, and rises and falls with the rise and fall of the water level in the valve chamber.

When the standpipe is filled with water and the water reaches the intake and exhaust valve, the float valve body rises as the water level rises. The float valve body then abuts against the floating valve body from below, moving the floating valve body upward. As the floating valve body moves upward, the float valve body closes the secondary air hole. The floating valve body then abuts against the ceiling of the valve chamber, closing the air hole. When the floating valve body closes the air hole, the pressure inside the valve chamber and the external pressure are balanced, and the water level inside the valve chamber is maintained at a specified height. Here, if air mixed with the water in the standpipe accumulates inside the valve chamber after the standpipe is filled with water, the water level drops. In this state, the float valve body tilts and opens the secondary air hole while the floating valve body keeps the air hole closed. Therefore, the air that has moved from the standpipe into the valve chamber is discharged to the outside from the secondary air hole through the air hole and the intake and exhaust port. When the air is discharged from the secondary air hole, the water level inside the valve chamber rises. As a result, the float valve body returns to its original position and the secondary air hole is closed. By repeatedly opening and closing the secondary air hole in this way, the intake and exhaust valve automatically expels air from inside the vertical pipe, which can cause pulsation and corrosion.

Utility Model Registration No. 3201854

In addition to the water from the standpipe, foreign matter mixed with the water can enter the valve chamber of the intake and exhaust valve. If the foreign matter that has entered the valve chamber adheres to the top surface of the float valve body, the foreign matter may become caught between the secondary air hole and the float valve body, making it impossible to close the secondary air hole. For this reason, it is desirable to periodically remove any foreign matter that has entered the valve chamber of the intake and exhaust valve. However, in order to remove the foreign matter from the valve chamber, the inside of the valve chamber must be cleaned by removing the intake and exhaust valve from the standpipe and disassembling the housing, etc.

In view of these circumstances, the objective of the present invention is to provide an intake and exhaust valve that can remove foreign matter that has entered the valve chamber without removing it from the standpipe.

To solve the above problems, the intake and exhaust valve of the present invention has a housing with a connecting pipe portion connected to a standpipe and an intake and exhaust port, and a valve chamber partitioned inside the housing, the bottom of the valve chamber is provided with a communication port that communicates with the standpipe via the connecting pipe portion, the ceiling of the valve chamber is provided with an air hole that communicates with the intake and exhaust port, the housing portion located between the communication port and the air hole in the vertical direction is provided with an opening that communicates between the valve chamber and the outside of the housing, and a plug that closes the opening is removably attached to the opening.

The intake and exhaust valve of the present invention has a housing with a valve chamber defined inside, and an opening that connects the valve chamber to the outside of the housing. Therefore, if a foreign object gets into the valve chamber after the intake and exhaust valve is attached to the standpipe and filled with water, the plug attached to the opening can be removed to open the opening, allowing the water inside the valve chamber to flow out through the opening. This allows the foreign object that has gotten into the valve chamber to be removed from inside the valve chamber, so there is no need to remove the intake and exhaust valve from the standpipe to remove the foreign object.

Here, the topmost part of the standpipe is generally piped in a pipe shaft in which an electric meter, information system wiring, a water heater, a gas meter, etc. are installed. Therefore, the operation of removing the plug from the opening provided in the intake and exhaust valve is performed in a relatively narrow space in the pipe shaft. Therefore, when the connecting pipe part is coaxially connected to the topmost part of the standpipe, depending on the orientation of the housing around the axis, there may be no space to operate the plug attached to the opening. In response to such a problem, in the present invention, the connecting pipe part is coaxially connected to the standpipe, and the housing part has, as the opening , a first opening and a second opening that are different around the axis of the connecting pipe part, the first opening and the second opening are provided at the same height position in the vertical direction, and the plug is attached to each of the first opening and the second opening. In this way, a plurality of openings are provided at different positions in the circumferential direction of the housing part. Therefore, when there is no space to operate the plug in one opening, the plug attached to the other opening can be operated to open the opening.

In this case, the first opening and the second opening can be positioned on opposite sides of the axis. In this way, the first opening and the second opening are spaced apart, so that when there is no space to operate the plug in one opening, it may be possible to operate the plug attached to the other opening.

In the present invention, a floating valve body is arranged in the valve chamber so as to be able to rise and fall and opens and closes the air hole, a secondary air hole is provided on the floating valve body and connects the air hole and the communication port, a float is arranged in the valve chamber in a state in which it can abut the floating valve body from below and rises and falls with the rise and fall of the water level in the valve chamber, and a valve mechanism that opens and closes the secondary air hole by the movement of the float, and when the floating valve body closes the air hole with the valve mechanism closing the secondary air hole, the water level can be considered to have reached the opening. In other words, after filling the standpipe with water, when the floating valve body closes the air hole with the valve mechanism closing the secondary air hole, the pressure in the valve chamber and the atmospheric pressure outside the housing are balanced, and the water level is maintained at a predetermined height. In this state, if the water level reaches the opening, the water in the valve chamber can be easily drained to the outside by removing the plug from the opening. For example, if the intake and exhaust valve is connected to a standpipe via a stopcock, water can be allowed to flow out of the opening by closing the stopcock and then removing the plug from the opening.

In this case, when the floating valve body closes the air hole with the valve mechanism closing the auxiliary air hole, the water level can be positioned above the opening. In this way, for example, in a case where the intake and exhaust valve is connected to a standpipe via a stopcock, when the stopcock is closed and then the plug is removed from the opening, a predetermined amount of water above the lower end of the opening can be discharged out of the valve chamber. Therefore, when a foreign object mixed in the water floats to the water surface inside the valve chamber, the foreign object can be easily discharged.

In the present invention, the valve mechanism may include a valve body held by the floating valve body in a state in which it can be displaced between a closed position that closes the secondary air hole and an open position that opens the secondary air hole, and a link mechanism that maintains the valve body in the closed position when the float is in contact with the floating valve body and moves the valve body to the open position when the float moves downwardly away from the floating valve body. In this way, a link mechanism is interposed between the float, which rises and falls with the rise and fall of the water surface, and the valve body that opens and closes the secondary air hole. Therefore, the link mechanism can separate the float and the valve body in the vertical direction. As a result, when the floating valve body closes the air hole with the valve mechanism closing the secondary air hole, the secondary air hole and the valve body can be separated upward from the water surface. Therefore, even if a foreign object enters the valve chamber together with the water from the vertical pipe, the foreign object can be prevented or suppressed from adhering to the secondary air hole and the valve body. Furthermore, even if foreign matter that has entered the valve chamber adheres to the float, it is possible to prevent or suppress the foreign matter from becoming caught between the valve body and the secondary air hole.

In the present invention, the auxiliary air hole may penetrate the floating valve body in the vertical direction, the valve mechanism may include a valve seat surrounding the lower end opening of the auxiliary air hole and a valve portion provided on the upper surface of the float, and the float may move between a closed position in which the valve portion abuts against the valve seat to close the auxiliary air hole and an open position in which a gap is formed between the valve portion and the valve seat when the float is in contact with the floating valve body. Even with this configuration, the housing has an opening communicating with the valve chamber, so that water in the valve chamber can flow out through the opening. This allows foreign matter that has entered the valve chamber to be removed from the valve chamber, so there is no need to remove the intake and exhaust valve from the upright pipe to remove the foreign matter.

The intake and exhaust valve of the present invention has a housing with a valve chamber defined inside, and an opening that connects the valve chamber to the outside of the housing. Therefore, if foreign matter enters the valve chamber along with the water from the standpipe, the plug attached to the opening can be removed to open the opening, allowing the water inside the valve chamber to flow out through the opening. This allows the foreign matter that has entered the valve chamber to be removed from inside the valve chamber, so there is no need to remove the intake and exhaust valve from the standpipe to remove the foreign matter.

FIG. 2 is an explanatory diagram of an installation state of an intake and exhaust valve to which the present invention is applied. FIG. 2 is a vertical cross-sectional view of the intake and exhaust valve of the first embodiment. 3 is a cross-sectional view of the intake and exhaust valve of FIG. 2 when viewed obliquely from above. FIG. FIG. 3 is an exploded perspective view of the intake and exhaust valve of FIG. 2 . 3 is an explanatory diagram of the intake and exhaust operation of the intake and exhaust valve of FIG. 2 . FIG. FIG. 11 is a vertical cross-sectional view of an intake and exhaust valve according to a second embodiment of the present invention.

Below, an intake and exhaust valve according to an embodiment of the present invention will be described with reference to the drawings.

(Overall composition)
Fig. 1 is an explanatory diagram of an installation state of an intake and exhaust valve to which the present invention is applied. Fig. 2 is a vertical cross-sectional view of the intake and exhaust valve. Fig. 3 is a cross-sectional view of the intake and exhaust valve when viewed obliquely from above. Fig. 4 is an exploded perspective view of the intake and exhaust valve. Fig. 3 shows the valve with the plug removed. In Figs. 3 and 4, the floating valve body is shown in a cut-out state.

As shown in Figure 1, the intake and exhaust valve 1 of this example is attached to the top of a water supply standpipe 2 for a structure such as a building or condominium. The top of the standpipe 2 is piped into a narrow space inside a pipe shaft in which an electric meter, information system wiring, water heater, gas meter, etc. are installed.

The standpipe 2 is made of metal or polyethylene. The standpipe 2 has a stop valve 3 at its upper end. A drain hopper 5 is provided on the side of the standpipe 2. A drain pipe 6 is connected to the intake and exhaust valve 1. The drain pipe 6 extends laterally from the intake and exhaust valve 1 toward the drain hopper 5 side, and then bends downward. The lower end opening of the drain pipe 6 faces the drain hopper 5 with a predetermined gap in the vertical direction.

In the following, the intake and exhaust valve 1 will be described in an installation position in which it is installed at the top of the standpipe 2. The direction along the axis L of the standpipe 2 is the up-down direction X. The direction in which the standpipe 2 and the drain pipe 6 are arranged is the perpendicular direction Y. The up-down direction X and the perpendicular direction Y are perpendicular to each other.

(Intake and exhaust valves)
2 and 3, the intake and exhaust valve 1 has a housing 8 and a valve chamber 10 defined inside the housing 8. The housing 8 has a housing member 11 connected to the stopcock 3 of the standpipe 2, an annular bonnet member 12 that covers the housing member 11 from above X2, and an external drainage cover 13 that is attached to the bonnet member 12 from above X2. The external drainage cover 13 has an intake and exhaust port 14. A drain pipe 6 is connected to the intake and exhaust port 14. The housing 8 also has an air hole component 16 that defines an air hole 15 on the inner circumferential side of the bonnet member 12, and a cap 17 that fixes the air hole component member 16 to the bonnet member 12.

As shown in FIG. 4, the housing member 11 includes a connecting pipe portion 21 to which the stopcock 3 is connected, an annular bottom portion 22 extending from the upper end portion of the connecting pipe portion 21 toward the outer periphery in the upward direction X2, and a cylindrical body portion 23 extending from the outer periphery edge of the annular bottom portion 22 in the upward direction X2. As shown in FIG. 1, when the intake and exhaust valve 1 is attached to the stopcock 3, the axis of the vertical pipe 2 is coaxial with the axis of the connecting pipe portion 21.

As shown in FIG. 4, the cylindrical body portion 23 has a male thread 23a on the outer peripheral surface of the upper end portion. A first opening 18 and a second opening 19 are provided in the middle of the cylindrical body portion 23 in the vertical direction X. The first opening 18 and the second opening 19 are located on both sides of the axis L. The first opening 18 and the second opening 19 each penetrate the cylindrical body portion 23 in the perpendicular direction Y. In this example, the first opening 18 and the second opening 19 are provided at the same height position in the vertical direction X. In addition, the first opening 18 and the second opening 19 are provided at an angular interval of 180°. The edge portion of the first opening 18 on the outer peripheral surface of the cylindrical body portion 23 is provided with a ring-shaped first protrusion 18a that protrudes outward. The edge portion of the second opening 19 on the outer peripheral surface of the cylindrical body portion 23 is provided with a ring-shaped second protrusion 19a that protrudes outward. As shown in Figures 1 and 2, a plug 20 is removably attached to each of the first opening 18 and the second opening 19. Each plug 20 closes the first opening 18 and the second opening 19, respectively.

As shown in FIG. 4, the bonnet member 12 includes a tubular portion 25, an annular plate portion 26 extending inward from the upper edge of the tubular portion 25, and an annular protrusion 27 protruding upward X2 from the middle of the radial direction of the annular plate portion 26. An internal female thread 25a that screws into the male thread 23a of the cylindrical body portion 23 is provided on the inner peripheral surface of the tubular portion 25. An internal female thread 27a is provided on the inner peripheral surface of the annular protrusion 27.

As shown in FIG. 3, the bonnet member 12 and the housing member 11 are integrated by screwing the male thread 23a of the housing member 11 into the internal female thread 25a of the bonnet member 12. An O-ring 29 is inserted between the cylindrical portion 25 of the bonnet member 12 and the cylindrical body portion 23 of the housing member 11.

As shown in FIG. 2, the air hole component 16 comprises a cylindrical air hole component 31 and an annular flange portion 32 that spreads outward from the upper edge of the air hole component 31. The air hole component 31 is inserted into the central hole of the bonnet member 12 (annular plate portion 26). The flange portion 32 is located on the inner periphery of the annular protrusion 27 of the annular plate portion 26. Here, a packing 34 is sandwiched between the bonnet member 12 and the air hole component 16.

As shown in FIG. 4, the cap 17 includes an annular plate portion 35 that abuts against the flange portion 32 of the air hole component 16 from the upper side X2, an annular wall portion 36 that extends from the outer peripheral edge of the annular plate portion 35 toward the upper side X2, and an annular flange portion 37 that protrudes from the upper end edge of the annular wall portion 36 to the outer peripheral side. The outer peripheral surface of the annular wall portion 36 is provided with a male thread 36a that can be screwed into the inner female thread 27a of the annular protrusion 27 of the bonnet member 12. As shown in FIG. 2, the cap 17 is fixed to the bonnet member 12 with the annular wall portion 36 screwed into the inner peripheral side of the annular protrusion 27 and the annular flange portion 37 abutting against the upper end surface of the annular protrusion 27. As a result, the air hole component 16 is fixed to the bonnet member 12 with the packing 34 sandwiched between the air hole component 16 and the bonnet member 12.

The packing 34 has an annular protruding portion that protrudes downward X1 from between the air hole forming portion 31 of the air hole forming member 16 and the inner peripheral end of the annular plate portion 26 of the bonnet member 12. The central hole of the air hole forming portion 31 of the air hole forming member 16 is the air hole 15. The protruding portion of the packing 34 surrounds the air hole 15. As shown in FIG. 3, the protruding portion of the packing 34 is the valve seat 39 against which the floating valve body 61 that opens and closes the air hole 15 abuts.

Next, as shown in FIG. 4, the external drainage cover 13 includes a tube portion 41 located on the outer periphery of the annular protrusion 27 of the bonnet member 12, a pipe portion 42 extending in the perpendicular direction Y above the tube portion 41 at X2, and a flow path forming portion 43 connecting the tube portion 41 and the pipe portion 42. The external drainage cover 13 is fixed to the bonnet member 12 by a plurality of screws 45. As shown in FIG. 2 and FIG. 3, an O-ring 46 is interposed between the tube portion 41 and the annular protrusion 27. The tip of the pipe portion 42 is the intake and exhaust port 14. When the external drainage cover 13 is fixed to the bonnet member 12, the inside of the external drainage cover 13 becomes an internal flow path 44 that connects the air hole 15 and the intake and exhaust port 14. The internal flow path 44 bends laterally from the air hole 15 toward the upper X2 to reach the intake and exhaust port 14.

The internal flow path 44 contains a straightening net 50. The straightening net 50 is a mesh-like member made of metal or resin. The straightening net 50 has a tube portion 47 and a closing portion 48 that closes the upper side of the tube portion 47. The straightening net 50 is placed on the annular plate portion 35 of the cap 17. The straightening net 50 straightens the air flowing from the intake and exhaust port 14 toward the air hole 15. This allows the intake and exhaust valve 1 to increase the amount of air intake when taking in air from the intake and exhaust port 14. The straightening net 50 also prevents foreign objects and insects from entering the inside of the intake and exhaust valve 1 from the intake and exhaust port 14 side.

2 and 3, the space surrounded by the housing member 11, the bonnet member 12, and the air hole component 16 is the valve chamber 10. The valve chamber 10 has a communication port 52 at its bottom, which communicates with the standpipe 2 via the connecting pipe portion 21. The bottom of the valve chamber 10 is the annular upper end surface of the connecting pipe portion 21. The communication port 52 is provided at the bottom of the valve chamber 10. The communication port 52 is the upper end opening of the connecting pipe portion 21. The ceiling of the valve chamber 10 is defined by the annular plate portion 26 of the bonnet member 12, the valve seat 39, and the air hole component 31 of the air hole component 16. The ceiling of the valve chamber 10 is provided with an air hole 15 that communicates with the intake/exhaust port 14. The air hole 15 is the central hole of the air hole component 31. The first opening 18 and the second opening 19 communicate the valve chamber 10 with the outside of the housing 8. The first opening 18 and the second opening 19 are provided in the housing portion 9 located between the communication port 52 and the air hole 15 in the vertical direction X of the housing 8. The second opening 19 is located at the same angular position around the axis L as the intake and exhaust port 14.

As shown in FIG. 2, the valve chamber 10 has a bucket 55 inside. As shown in FIG. 4, the bucket 55 has a bucket bottom 56 with a circular contour, a bucket cylinder 57 extending upward in the X2 direction from the outer periphery of the bucket bottom 56, and a bucket flange 58 protruding from the upper end of the bucket cylinder 57 to the outer periphery. A plurality of openings 59 are provided in the bucket bottom 56 and the bucket cylinder 57. Thus, water enters the inside of the bucket 55. As shown in FIG. 3, the bucket flange 58 is sandwiched between the housing member 11 and the bonnet member 12. This fixes the bucket 55 inside the valve chamber 10.

Furthermore, a floating valve body 61, a float 62, and a coil spring 63 are housed within the valve chamber 10. As shown in Figures 2 and 3, the floating valve body 61 is arranged so that it can rise and fall within the bucket 55. The floating valve body 61 opens and closes the air hole 15. The float 62 is arranged within the bucket 55, and rises and falls with the rise and fall of the water level within the valve chamber 10. The float 62 can abut against the floating valve body 61 from below X1. The coil spring 63 is arranged on the outer periphery of the float 62 within the bucket 55. The coil spring 63 surrounds the float 62.

As shown in FIG. 4, the float 62 comprises a float body 65 having a truncated cone shape whose outer diameter decreases toward the downward direction X1, and a number of ribs 66 protruding from the float body 65 to the outer periphery. Each rib 66 extends in the vertical direction X. Each rib 66 is provided at equal angular intervals on the outer periphery of the float body 65. A cross section of each rib 66 cut on an imaginary plane perpendicular to the vertical direction X has a mountain shape that tapers radially outward. Here, each rib 66 protrudes more from the float body 65 toward the downward direction X1. As a result, the ridge of each rib 66 extends parallel to the central axis of the float body 65.

2, the floating valve body 61 has a valve body 71 with an upper surface 71a capable of closing the air hole 15, and a cylindrical skirt portion 72 extending downward from the outer periphery of the valve body 71 toward the X1. The outline shape of the valve body 71 when viewed from above the X2 is circular. The valve body 71 is provided with an auxiliary air hole 60 that communicates with the air hole 15. The auxiliary air hole 60 communicates between the air hole 15 and the communication port 52. The skirt portion 72 is cylindrical. As shown in FIG. 3, the upper part of the float 62 is inserted into the skirt portion 72. The upper end of the coil spring 63 abuts against the lower end of the skirt portion 72. Here, the coil spring 63 biases the floating valve body 61 against the valve seat 39.

The valve body 71 has an inner valve body chamber 74 and an abutment portion 75 against which the float 62 can abut below the valve body chamber 74 at X1. The abutment portion 75 is annular. The skirt portion 72 extends downward from the outer peripheral edge of the abutment portion 75 toward X1. The outer peripheral edge portion of the upper surface of the float 62 (float body 65) abuts against the abutment portion 75 from below X1.

As shown in Fig. 4, the valve body accommodating chamber 74 is provided in the central portion of the valve body 71 when viewed from the up-down direction X. The valve body accommodating chamber 74 is provided in the valve body 71 in a tunnel shape. The valve body accommodating chamber 74 extends from one end in the orthogonal direction Y to the other end in the up-down direction X at the central portion of the valve body 71. Therefore, one end of the valve body accommodating chamber 74 in the orthogonal direction Y is open. A side wall surface 76 is present at the other end of the valve body accommodating chamber 74 in the orthogonal direction Y. The side wall surface 76 extends in the up-down direction X.

2, the valve body accommodating chamber 74 includes, from one side to the other side in the orthogonal direction Y, a large diameter portion 77 having a large inner diameter dimension, a small diameter portion 78 having an inner diameter dimension smaller than that of the large diameter portion 77, and an annular surface 79 facing one side in the orthogonal direction Y between the large diameter portion 77 and the small diameter portion 78. The side wall surface 76 seals one end of the small diameter portion 78 in the orthogonal direction Y.

As shown in FIG. 4, the valve body accommodating chamber 74 has a communication hole 80 that extends downward X1 from a position spaced apart from the side wall surface 76 of the valve body accommodating chamber 74. As shown in FIG. 2 and FIG. 3, the communication hole 80 connects the valve body accommodating chamber 74 and the valve chamber 10 on the inner circumferential side of the annular abutment portion 75.

Here, the auxiliary air hole 60 includes an upper opening 82 provided on the upper surface 71a of the valve body 71, a lower opening 83 provided on the side wall surface 76 of the valve body accommodating chamber 74, and an air passage 84 that penetrates the valve body 71 and connects the upper opening 82 and the lower opening 83. The air passage 84 includes a horizontal passage 84a extending from the lower opening 83 in the perpendicular direction Y, and a vertical passage 84b extending from the upper opening 82 downward X1 and communicating with the horizontal passage 84a. Therefore, the auxiliary air hole 60 extends from the side wall surface 76 of the valve body accommodating chamber 74 to the other side in the perpendicular direction Y, then bends upward X2 to reach the upper surface 71a of the valve body 71.

In the valve body accommodating chamber 74, a retaining ring 86, a spring receiving member 87, a coil spring 88 (biasing member), and a valve body 89 are coaxially arranged in this order from one side to the other side (side wall surface 76 side) in the orthogonal direction Y. The valve body 89 opens and closes the secondary air hole 60. As shown in FIG. 4, the spring receiving member 87 is annular. The retaining ring 86 is a CR-type retaining ring having multiple protrusions protruding from the outer periphery. The retaining ring 86 is attached to the middle of the large diameter portion 77 in the orthogonal direction Y and abuts the spring receiving member 87 against the annular surface 79. The retaining ring 86 prevents the spring receiving member 87 from moving to the other side in the orthogonal direction Y. The coil spring 88 is arranged between the spring receiving member 87 and the valve body 89 and biases the valve body 89 toward the side wall surface 76. Here, the valve body 89 is held by the floating valve body 61 via a retaining ring 86, a spring receiving member 87, and a coil spring 88. Therefore, the valve body 89 rises and falls together with the floating valve body 61. The valve body 89 is supported by the coil spring 88 so that it can be displaced between a closed position 89A where it faces the side wall surface 76 and closes the lower opening 83, and an open position 89B where it is inclined relative to the side wall surface 76 and opens the lower opening 83 (see FIG. 5).

As shown in FIG. 4, the valve body 89 is fitted with an axial member 91 extending in the opposite direction to the side wall surface 76. As shown in FIG. 2, the axial member 91 passes through the coil spring 88, the spring bearing member 87, and the retaining ring 86 and extends to the upper X2 of the communication hole 80. On the other hand, the float 62 is fitted with a link member 92 extending from the outer peripheral edge of the float body 65 to the upper X2. The link member 92 protrudes into the valve body accommodating chamber 74 through the communication hole 80. The link member 92 has a connection portion 93 to which the axial member 91 is connected at its upper end portion. The connection portion 93 has an elongated hole 93a extending in the vertical direction X and a notch 93b that communicates from the outer peripheral edge of the link member 92 to the lower end portion of the elongated hole 93a. The end portion of the axial member 91 is inserted into the elongated hole 93a through the notch portion 93b.

As shown in FIG. 2, the retaining ring 86, the spring receiving member 87, the coil spring 88 (biasing member), the valve body 89, the shaft member 91, and the link member 92 constitute a valve mechanism 95 for opening and closing the secondary air hole 60. The coil spring 88 biases the valve body 89 toward the side wall surface 76 of the valve body accommodating chamber 74. The coil spring 88 also supports the valve body 89 so that it can be displaced between a closed position 89A that closes the secondary air hole 60 and an open position 89B that opens the secondary air hole 60.

The shaft member 91 and the link member 92 form a link mechanism 96 that displaces the valve body 89 between a closed position 89A and an open position 89B as the float 62 rises and falls. The link mechanism 96 maintains the valve body 89 in the closed position 89A when the float 62 is in contact with the abutment portion 75 of the floating valve body 61. The link mechanism 96 also moves the valve body 89 to the open position 89B when the float 62 moves away from the abutment portion 75 of the floating valve body 61 downward X1.

(Intake and exhaust operation)
Fig. 5 is an explanatory diagram of the intake and exhaust operation by the intake and exhaust valve 1. The intake and exhaust operation by the intake and exhaust valve 1 will be described with reference to Fig. 5. Fig. 5(a) shows the state in which the intake and exhaust valve 1 is discharging air. Fig. 5(b) shows the state after filling of the standpipe 2 with water is completed. Fig. 5(c) shows the state in which negative pressure is generated on the side of the standpipe 2.

Before the vertical pipe 2 is completely filled with water, as shown in FIG. 5(a), the floating valve body 61 is biased against the valve seat 39 by the coil spring 63. Therefore, the floating valve body 61 closes the air hole 15. The float 62 is placed on the bucket bottom 56 by its own weight. Therefore, the float 62 is spaced downward from the floating valve body 61 to the X1.

When the float 62 is separated downward from the floating valve body 61 in the X1 direction, the opening edge of the long hole 93a of the link member 92 abuts against the end portion of the shaft member 91 opposite the valve body 89 from the upper X2, moving the end portion of the shaft member 91 opposite the valve body 89 downward in the X1 direction. As a result, the valve body 89 is positioned in an open position 89B inclined relative to the side wall surface 76, and the lower opening 83 is released, opening the secondary air hole 60. The secondary air hole 60 and the air hole 15 are in communication.

When the vertical pipe 2 is filled with water, the air in the vertical pipe 2 is discharged to the outside from the intake and exhaust port 14 via the valve chamber 10, the secondary air hole 60, and the air hole 15 of the intake and exhaust valve 1. When the water subsequently reaches the intake and exhaust valve 1, the float 62 rises as the water level 100 in the valve chamber 10 rises.

When the float 62 abuts against the abutment portion 75 of the floating valve body 61, the valve body 89 of the valve mechanism 95 is positioned in the closed position 89A, closing the secondary air hole 60. That is, when the float 62 abuts against the abutment portion 75 of the floating valve body 61, the long hole 93a of the link member 92 is positioned at the same height as the lower opening 83 of the secondary air hole 60. As a result, the shaft member 91 attached to the valve body 89 passes through the long hole 93a of the link member 92 while extending horizontally in the perpendicular direction Y. As a result, the valve body 89 is positioned in the closed position 89A directly facing the side wall surface 76, so that the lower opening 83 is closed and the secondary air hole 60 is closed.

When the floating valve body 61 closes the air hole 15 while the valve mechanism 95 closes the secondary air hole 60, the water level 100 in the valve chamber 10 is maintained at a predetermined height due to the balance between the pressure in the valve chamber 10 and the atmospheric pressure. This state is shown in FIG. 5(b), and is the state where water filling is completed. When the floating valve body 61 closes the air hole 15 while the valve mechanism 95 closes the secondary air hole 60, the water level 100 in the valve chamber 10 reaches the first opening 18 and the second opening 19. In this example, the water level 100 in the valve chamber 10 is located at a position X2 above the first opening 18 and the second opening 19. Therefore, the first opening 18 and the second opening 19 are submerged.

When the tank is fully filled with water, the float 62 is positioned at its highest raised position 62A within the valve chamber 10. The upper surface of the float 62 at the raised position 62A is at approximately the same height as the water surface 100. When the float 62 is positioned at the raised position 62A, that is, when the float 62 and the floating valve body 61 are in contact and the floating valve body 61 closes the air hole 15, the valve body 89 is in the closed position 89A and the secondary air hole 60 is closed. The valve body 89 and the secondary air hole 60 are spaced upwards X2 from the water surface 100.

Then, when the air mixed in the water in the vertical pipe 2 rises and accumulates in the valve chamber 10, the water level 100 drops. When this happens, the float 62 moves downward from the raised position 62A to the X1 position while the floating valve body 61 keeps the air hole 15 closed. In other words, the float 62 moves downward from the abutment portion 75 of the floating valve body 61 to the X1 position.

When the float 62, which is in contact with the floating valve body 61, moves downward from the floating valve body 61 in the X1 direction, as shown in FIG. 5(a), the link member 92 moves downward in the X1 direction in conjunction with the movement of the float 62. This causes the link member 92 to move the end portion of the shaft member 91 opposite the valve body 89 downward in the X1 direction. As a result, the valve body 89 is positioned in the open position 89B inclined relative to the side wall surface 76, and the lower opening 83 is released, opening the secondary air hole 60.

When the secondary air hole 60 is opened, the air that has moved from the water in the vertical pipe 2 into the valve chamber 10 is discharged from the secondary air hole 60 to the outside via the air hole 15 and the intake/exhaust port 14.

When the air inside is discharged through the secondary air hole 60, the water surface 100 rises to the position shown in FIG. 5(b). Therefore, the float 62 returns to the raised position 62A and abuts against the abutment portion 75 of the floating valve body 61. When the float 62 abuts against the abutment portion 75, the long hole 93a of the link member 92 is positioned at the same height as the lower opening 83 of the secondary air hole 60, so that the shaft member 91 attached to the valve body 89 extends horizontally in the perpendicular direction Y. As a result, the valve body 89 is positioned at the closed position 89A directly facing the side wall surface 76, and closes the secondary air hole 60. By repeating such an operation of opening and closing the secondary air hole 60, the intake and exhaust valve 1 automatically discharges the air in the vertical pipe 2, which causes pulsation and corrosion, from the inside of the vertical pipe 2.

If the water supply pressure drops due to a water outage or other reason, the water level 100 drops and negative pressure is generated in the standpipe 2. As the water level drops, the float 62 drops. The suction force caused by the negative pressure also causes the floating valve body 61 to drop against the biasing force of the coil spring 63. As a result, as shown in Figure 5(c), the air hole 15 opens, and air is sucked in by the intake and exhaust valve 1, supplying air into the standpipe 2. This prevents water from flowing back into the standpipe 2 from the water supply equipment at the end of each unit due to negative pressure.

(Discharge of foreign matter from the valve chamber)
After the standpipe 2 is filled with water, foreign matter may enter the valve chamber 10 of the intake and exhaust valve 1 along with the water. If the foreign matter that has entered the valve chamber 10 becomes caught between the secondary air hole 60 and the valve body 89, the secondary air hole 60 cannot be closed. As a result, water that has reached the valve chamber 10 of the intake and exhaust valve 1 continues to flow out of the secondary air hole 60. To prevent such a situation from occurring, it is desirable to periodically perform maintenance work on the intake and exhaust valve 1 to remove any foreign matter that has entered the valve chamber 10.

When carrying out this type of maintenance work, first close the stopcock 3. Next, remove the plug 20 from the housing 8 of the intake and exhaust valve 1.

Here, the operation of removing the plug 20 from the first opening 18 and the second opening 19 provided in the intake and exhaust valve 1 is performed in a relatively narrow space inside the pipe shaft. Furthermore, when the connecting pipe part 21 is coaxially connected to the topmost part of the vertical pipe 2, depending on the orientation of the housing 8 around the axis L, there may be no space to operate the plug 20. In such a case, in this example, the housing part 9 has the first opening 18 and the second opening 19 provided at different positions around the axis L of the connecting pipe part 21. Furthermore, the first opening 18 and the second opening 19 are located on opposite sides across the axis L. Therefore, when there is no space to operate the plug 20 in one opening (one of the first opening 18 and the second opening 19), the plug 20 can be inserted into the other opening (the first opening 18).
A plug 20 attached to the other of the opening 18 and the second opening 19 can be operated to open that opening (first opening 18 or second opening 19).

When the valve mechanism 95 closes the secondary air hole 60 and the floating valve body 61 closes the air hole 15, the water surface 100 is located at X2 above the openings (first opening 18, second opening 19). Therefore, when the plug 20 is removed after the stopcock 3 is closed, a predetermined amount of water located at X2 above the lower end of the openings (first opening 18 and second opening 19) can be discharged from the valve chamber 10. Therefore, if foreign matter is mixed in the water in the valve chamber 10 and is floating on the water surface 100, it is easy to discharge the foreign matter. Note that when water is discharged through the openings (first opening 18, second opening 19), the position of the water surface 100 in the valve chamber 10 descends. Therefore, the float 62 descends.

Then, the stop valve 3 is opened to introduce the water in the standpipe 2 into the valve chamber 10. In other words, when the stop valve 3 is opened, the water in the standpipe 2 naturally flows into the valve chamber 10 due to the pressure of the water being supplied to the standpipe 2. This causes the water in the valve chamber 10 to further flow out and expel any remaining foreign matter.

Then, the stop valve 3 is closed again to seal the opening (first opening 18 or second opening 19) that was left open by the plug 20. The stop valve 3 is then opened to allow the water in the vertical pipe 2 to flow into the valve chamber 10. This completes the maintenance work.

If the stop valve 3 is opened to allow the water in the standpipe 2 to flow into the intake and exhaust valve 1, the float 62 will rise as the water level 100 in the valve chamber 10 rises, just as it did when filling the tank with water. This will result in the state shown in Figure 5(b). In the state shown in Figure 5(b), the water level 100 is located at X2 above the first opening 18 and the second opening 19.

(Action and Effect)
The intake and exhaust valve 1 of this example is provided with openings (first opening 18, second opening 19) that communicate the valve chamber 10 with the outside of the housing 8, in a housing 8 in which a valve chamber 10 is defined. Therefore, if a foreign object enters the valve chamber 10 after the intake and exhaust valve 1 is attached to the standpipe 2 and filled with water, the plug 20 attached to the opening (first opening 18 or second opening 19) can be removed to open the opening (first opening 18 or second opening 19) to allow the water in the valve chamber 10 to flow out through the opening (first opening 18 or second opening 19). This allows the foreign object that has entered the valve chamber 10 together with the water to be removed from the valve chamber 10, so there is no need to remove the intake and exhaust valve 1 from the standpipe 2 to remove the foreign object.

In this example, a link mechanism 96 is interposed between the float 62, which rises and falls with the rise and fall of the water surface 100, and the valve body 89, which opens and closes the secondary air hole 60. This allows the float 62 and the valve body 89 to be separated in the vertical direction X by the link mechanism 96. Therefore, when the floating valve body 61 closes the air hole 15 with the valve mechanism 95 closing the secondary air hole 60, the secondary air hole 60 and the valve body 89 can be separated upward X2 from the water surface 100. Therefore, even if a foreign object enters the valve chamber 10 together with the water from the vertical pipe 2, the foreign object can be prevented or suppressed from adhering to the secondary air hole 60 and the valve body 89. Also, even if a foreign object that has entered the valve chamber 10 adheres to the float 62, the foreign object can be prevented or suppressed from being caught between the valve body 89 and the secondary air hole 60.

Here, the valve element 89 that opens and closes the secondary air hole 60 is held by the floating valve element 61, and therefore rises and falls together with the floating valve element 61. Furthermore, when the floating valve element 61 closes the air hole 15 with the valve mechanism 95 closing the secondary air hole 60, the valve element 89 and the secondary air hole 60 move away from the water surface 100 toward the upper direction X2. Therefore, even if foreign matter enters the valve chamber 10 along with the water, it is possible to prevent or suppress the foreign matter from adhering to the valve element 89 and the secondary air hole 60. This makes it possible to prevent or suppress the secondary air hole 60 from becoming unable to close due to foreign matter getting caught between the valve element 89 and the secondary air hole 60.

The valve mechanism 95 also includes a coil spring 88 that is held by the floating valve body 61 and biases the valve body 89 to the closed position 89A. The coil spring 88 also supports the valve body 89 so that it can be displaced between the open position 89B and the closed position 89A. This makes it easy to maintain the secondary air hole 60 closed by the valve body 89. In addition, the coil spring 88 that biases the valve body 89 can be used to support the valve body 89 so that it can be displaced, thereby reducing the number of parts.

Furthermore, the floating valve body 61 includes a valve body portion 71 having an upper surface 71a capable of closing the air hole 15, a valve body accommodating chamber 74 partitioned inside the valve body portion 71, and an abutment portion 75 against which the float 62 can abut at the lower X1 of the valve body accommodating chamber 74. The auxiliary air hole 60 includes an upper opening 82 provided on the upper surface 71a of the valve body portion 71, a lower opening 83 provided on the side wall surface 76 of the valve body accommodating chamber 74, and an air passage 84 that passes through the valve body portion 71 and connects the upper opening 82 and the lower opening 83. Furthermore, the valve body 89 is accommodated in the valve body accommodating chamber 74 and opens and closes the lower opening 83. Therefore, when the float 62 and the floating valve body 61 are in contact with each other after the water filling is complete, the valve body housing chamber 74 moves upward X2 away from the water surface 100 and the float 62. This prevents or inhibits the water in the valve chamber 10 from reaching the valve body housing chamber 74, and prevents or inhibits foreign matter that has entered the valve chamber 10 with the water from entering the valve body housing chamber 74 and becoming caught between the valve body 89 and the lower opening 83 of the secondary air hole 60.

The lower opening 83 of the secondary air hole 60 is provided on the side wall surface 76 of the valve body accommodating chamber 74. Therefore, even if a foreign object is caught between the valve body 89 and the lower opening 83 of the secondary air hole 60, the foreign object is likely to fall downward X1 along the side wall surface 76 when the valve body 89 is displaced.

Example 2
6 is a cross-sectional view of an intake and exhaust valve 1A of Example 2. The intake and exhaust valve 1A of this example has a configuration corresponding to that of the intake and exhaust valve 1 of Example 1. Therefore, the corresponding configurations are denoted by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 6, the intake and exhaust valve 1A has a housing 8 and a valve chamber 10 defined inside the housing 8. The housing 8 has a housing member 11 connected to a stopcock 3 at the upper end of the vertical pipe 2, an annular bonnet member 12 that covers the housing member 11 from above X2, and an external drainage cover 13 that is attached to the bonnet member 12 from above X2. The external drainage cover 13 has an intake and exhaust port 14. A drain pipe 6 is connected to the intake and exhaust port 14. The housing 8 also has an air hole component 16 that defines an air hole 15 on the inner periphery of the bonnet member 12, and a cap 17 that fixes the air hole component 16 to the bonnet member 12.

The housing member 11 includes a connecting pipe portion 21 to which the stopcock 3 is connected, an annular bottom portion 22 extending from the upper end portion of the connecting pipe portion 21 toward the outer periphery in the upward direction X2, and a cylindrical body portion 23 extending from the outer periphery edge of the annular bottom portion 22 in the upward direction X2. A first opening 18 and a second opening 19 are provided in the middle of the cylindrical body portion 23 in the vertical direction X. The first opening 18 and the second opening 19 are located on both sides of the axis L. The first opening 18 and the second opening 19 each penetrate the cylindrical body portion 23 in the perpendicular direction Y. In this example, the first opening 18 and the second opening 19 are provided at the same height position in the vertical direction X. In addition, the first opening 18 and the second opening 19 are provided at an angular interval of 180°. A ring-shaped first protrusion 18a protruding outward is provided at the edge portion of the first opening 18 on the outer periphery of the cylindrical body portion 23. An annular second protrusion 19a protruding outward is provided on the edge of the second opening 19 on the outer circumferential surface of the cylindrical body portion 23. Plugs 20 that close the first opening 18 and the second opening 19 are removably attached.

A gasket 34 is sandwiched between the bonnet member 12 and the air hole component 16. The gasket 34 has an annular protruding portion that protrudes downward X1 from between the air hole component 31 of the air hole component 16 and the inner peripheral end of the annular plate portion 26 of the bonnet member 12. The central hole of the air hole component 31 of the air hole component 16 is the air hole 15. The protruding portion of the gasket 34 surrounds the air hole 15. The protruding portion of the gasket 34 is the valve seat 39 against which the floating valve body 61 that opens and closes the air hole 15 abuts.

The space surrounded by the housing member 11, the bonnet member 12, and the air hole component 16 is the valve chamber 10. The bottom of the valve chamber 10 is the annular upper end surface of the connecting pipe portion 21. A communication port 52 is provided at the bottom of the valve chamber 10. The communication port 52 is the upper end opening of the connecting pipe portion 21. The ceiling of the valve chamber 10 is composed of the annular plate portion 26 of the bonnet member 12, the valve seat 39, and the air hole component 31 of the air hole component 16. The ceiling of the valve chamber 10 is provided with an air hole 15 that communicates with the intake and exhaust port 14. The air hole 15 is the central hole of the air hole component 31. The first opening 18 and the second opening 19 communicate the valve chamber 10 with the outside of the housing 8. The first opening 18 and the second opening 19 are provided in the housing portion 9 located between the communication port 52 and the air hole 15 in the vertical direction X in the housing 8.

The valve chamber 10 contains a bucket 55, a floating valve body 61, and a float 62. As shown in FIG. 6, the floating valve body 61 is arranged so that it can rise and fall within the bucket 55. The floating valve body 61 has a valve body portion 71 with an upper surface 71a that can close the air hole 15, and a cylindrical skirt portion 72 that extends downward from the outer periphery of the valve body portion 71 toward the X1. The valve body portion 71 also has a secondary air hole 60 provided in the valve body portion 71, and a bolt 103 screwed into the valve body portion 71 from the X1 below.

The auxiliary air hole 60 penetrates the valve body 71 in the vertical direction X to communicate the air hole 15 and the communication port 52. A recess 101 is provided on the underside of the valve body 71 at a position overlapping with the auxiliary air hole 60. An annular valve seat 102 is fixed to the recess 101. The valve seat 102 is an annular elastic member and surrounds the lower end opening of the auxiliary air hole 60. The lower end surface of the valve seat 102 protrudes downward X1 from the lower surface of the valve body 71. In addition, a bolt 103 is screwed from the lower X1 into the lower surface of the valve body 71 at a position separated from the recess 101. The head of the bolt 103 protrudes downward X1 from the lower end surface of the valve seat 102.

The float 62 is disposed in the bucket 55 and rises and falls with the rise and fall of the water surface 100 in the valve chamber 10. The float 62 can abut against the floating valve body 61 from below X1. A flat valve portion 105 is provided on the upper surface of the float 62. When the float 62 abuts against the bolt 103, the valve portion 105 abuts against the valve seat 102 and can close the secondary air hole 60. The valve portion 105 provided on the float 62 and the valve seat 102 fixed to the floating valve body 61 constitute a valve mechanism 95 that opens and closes the secondary air hole 60 by the movement of the float 62.

(Intake and exhaust operation)
When the standpipe 2 is filled with water and the water reaches the intake and exhaust valve 1A, the float 62 rises with the rise of the water surface 100. The float 62 then abuts against the bolt 103 from below, moving the floating valve body 61 upward to X2. When the floating valve body 61 moves upward to X2, the valve portion 105 of the float 62 abuts against the valve seat 102 of the floating valve body 61, closing the auxiliary air hole 60. After that, the floating valve body 61 abuts against the ceiling of the valve chamber 10, closing the air hole 15. When the valve mechanism 95 closes the auxiliary air hole 60 and the floating valve body 61 closes the air hole 15, the pressure inside the valve chamber 10 and the external pressure are balanced, and the water surface 100 inside the valve chamber 10 is maintained at a predetermined height. In FIG. 6, the position of the water surface 100 in this state is shown by an imaginary line. 6, when the floating valve body 61 closes the air hole 15 with the valve mechanism 95 closing the auxiliary air hole 60, the water level 100 in the valve chamber 10 reaches the first opening 18 and the second opening 19. In this example, the water level 100 in the valve chamber 10 is located at a position X2 above the first opening 18 and the second opening 19.

Here, after the vertical pipe 2 is filled with water, if the air mixed in the water in the vertical pipe 2 accumulates in the valve chamber 10, the water level 100 will drop. In this state, the float 62 tilts while the floating valve body 61 keeps the air hole 15 closed, forming a gap between the valve part 105 and the valve seat 102. This opens the secondary air hole 60, and the air that has moved from the vertical pipe 2 into the valve chamber 10 is discharged to the outside from the secondary air hole 60 through the air hole 15 and the intake and exhaust port 14. When the air is discharged from the secondary air hole 60, the water level 100 in the valve chamber 10 rises. Therefore, the float 62 returns to its original position, and the secondary air hole 60 is closed. By repeating this operation of opening and closing the secondary air hole 60, the intake and exhaust valve 1A automatically discharges air that causes pulsation and corrosion from inside the vertical pipe 2.

(Discharge of foreign matter from the valve chamber)
In this example, if foreign matter that has entered the valve chamber 10 together with the water adheres to the upper surface of the float 62, the foreign matter may become caught between the valve seat 102 surrounding the secondary air hole 60 and the valve portion 105 of the float 62, making it impossible to close the secondary air hole 60. If the secondary air hole 60 cannot be closed, water from the standpipe 2 will continue to flow out of the secondary air hole 60 through the valve chamber 10. To prevent such a situation from occurring, it is desirable to periodically perform maintenance work on the intake and exhaust valve 1A to remove foreign matter that has entered the valve chamber 10.

This maintenance work is the same as that of the intake and exhaust valve 1 described above. First, the stopcock 3 is closed. Next, the plug 20 is removed from the housing 8 of the intake and exhaust valve 1A. Here, in this example, the housing portion 9 of the housing 8 also has a first opening 18 and a second opening 19 provided at different positions around the axis L of the connecting pipe portion 21. Furthermore, the first opening 18 and the second opening 19 are located on opposite sides of the axis L. Therefore, if there is no space to operate the plug 20 in one opening (one of the first opening 18 and the second opening 19), the plug 20 attached to the other opening (the other of the first opening 18 and the second opening 19) can be operated to open that opening (the first opening 18 or the second opening 19).

When the valve mechanism 95 closes the secondary air hole 60 and the floating valve body 61 closes the air hole 15, the water surface 100 is located at X2 above the openings (first opening 18, second opening 19). Therefore, when the plug 20 is removed after the stopcock 3 is closed, a predetermined amount of water located at X2 above the lower end of the openings (first opening 18 and second opening 19) can be discharged from the valve chamber 10. Therefore, if foreign matter is mixed in the water in the valve chamber 10 and is floating on the water surface 100, it is easy to discharge the foreign matter. Note that when water is discharged through the openings (first opening 18, second opening 19), the position of the water surface 100 in the valve chamber 10 descends. Therefore, the floating valve body 61 and the float 62 descend.

Then, the stop valve 3 is opened to introduce the water in the standpipe 2 into the valve chamber 10. That is, when the stop valve 3 is opened, the water in the standpipe 2 naturally flows into the valve chamber 10 due to the pressure of the water being supplied to the standpipe 2. This causes the water in the valve chamber 10 to further flow out and any remaining foreign matter to be discharged. After that, the stop valve 3 is closed again to seal the opening (first opening 18 or second opening 19) that was opened by the plug 20. Then, the stop valve 3 is opened to allow the water in the standpipe 2 to flow into the valve chamber 10. This completes the maintenance work.

Now, if the stop valve 3 is opened to allow water from the standpipe 2 to flow into the intake and exhaust valve 1A, the floating valve body 61 and float 62 rise as the water level 100 in the valve chamber 10 rises, just as when filling the tank with water. After that, when the valve mechanism 95 closes the secondary air hole 60 and the floating valve body 61 closes the air hole 15, the pressure inside the valve chamber 10 and the external pressure are balanced, and the water level 100 in the valve chamber 10 is maintained at a predetermined height. When the valve mechanism 95 closes the secondary air hole 60 and the floating valve body 61 closes the air hole 15, the water level 100 is located at X2 above the first opening 18 and the second opening 19.

In the present example of the intake and exhaust valve 1A, foreign matter that has entered the valve chamber 10 can be expelled from the housing 8 through regular maintenance work.

In addition, if a foreign object becomes lodged between the valve seat 102 surrounding the secondary air hole 60 and the valve portion 105 of the float 62, making it impossible to close the secondary air hole 60, performing the above-mentioned maintenance work will allow the valve portion 105 of the float 62 and the valve seat 102 fixed to the floating valve body 61 to be cleaned with water introduced into the valve chamber 10 from the standpipe 2 by opening the stop valve 3 after opening the secondary air hole 60. This may make it possible to remove the foreign object lodged between the valve seat 102 and the valve portion 105, potentially resolving the condition in which the secondary air hole 60 cannot be closed.

(Modification)
The housing part 9 may have one opening. Alternatively, three or more openings may be provided at different positions around the axis L of the housing part 9. When the housing part 9 has a plurality of openings, the height positions of the openings in the up-down direction X may be different.

In the above example, when the floating valve body 61 closes the air hole 15 with the valve mechanism 95 closing the secondary air hole 60, the water surface 100 reaches the first opening 18 and the second opening 19, but the water surface 100 does not have to reach the first opening 18 and the second opening 19. That is, when the floating valve body 61 closes the air hole 15 with the valve mechanism 95 closing the secondary air hole 60, the first opening 18 and the second opening 19 may be located at X2 above the water surface 100. In this case, when the plug 20 is removed from the openings (first opening 18, second opening 19) after the stop valve 3 is closed, the water in the valve chamber 10 cannot be discharged to the outside. However, if the stop valve 3 is opened after the plug 20 is removed, water will flow from the standpipe 2 into the valve chamber 10 due to the pressure of the water supplied to the standpipe 2. This allows the water in the valve chamber 10 to flow out, so that any foreign matter mixed in the water in the valve chamber 10 can be expelled to the outside.

Reference Signs List 1, 1A... Intake and exhaust valve, 2... Standpipe, 3... Stopcock, 5... Drain hopper, 6... Drain pipe, 8... Housing, 9... Housing part, 10... Valve chamber, 11... Housing member, 12... Bonnet member, 13... External drainage cover, 14... Intake and exhaust port, 15... Air hole, 16... Air hole component, 16... Air hole 15 component, 17... Cap, 18... First opening, 18a... First protrusion, 19... Second opening, 19a... Second protrusion, 20... Plug, 21... Connection pipe part, 22... Annular bottom part, 23... Cylindrical body part, 25... Cylindrical part, 26... Annular plate part, 27... Annular protrusion, 29... O-ring, 31... Air hole component, 32... Fluke a flange portion, 34...packing, 35...annular plate portion, 36...annular wall portion, 37...annular flange portion, 39...valve seat, 41...tubular portion, 42...pipe portion, 43...flow path forming portion, 44...internal flow path, 46...O-ring, 47...tubular portion, 48...closure portion, 50...rectifying net, 52...communication port, 55...bucket, 56...bucket bottom, 57...bucket tubular portion, 58...bucket flange portion, 59...opening, 60...secondary air hole, 61...floating valve body, 62...float, 62A...raised position, 63...coil spring, 65...float body portion, 66...rib, 71...valve body portion, 72...skirt portion, 74...valve body accommodating chamber, 75...contact portion, 76...side wall surface, 77
...Large diameter portion, 78...Small diameter portion, 79...Annular surface, 80...Communicating hole, 82...Upper opening, 83...Lower opening, 84...Air passage, 84a...Horizontal passage, 84b...Vertical passage, 86...Retaining ring, 87...Spring support member, 88...Coil spring, 89...Valve body, 89A...Closed position, 89B...Open position, 91...Shaft member, 92...Link member, 93...Connection portion, 95...Valve mechanism, 96...Link mechanism, 100...Water surface, 101...Recess, 102...Valve seat, 103...Bolt, 105...Valve portion, L...Axis, X...Up-down direction, Y...Orthogonal direction

Claims (7)

a housing having a connecting pipe portion connected to the standpipe and an intake and exhaust port;
a valve chamber defined within the housing,
a communication port is provided at a bottom of the valve chamber, the communication port communicating with the vertical pipe via the connecting pipe portion;
An air hole communicating with the intake and exhaust port is provided on the ceiling of the valve chamber,
an opening portion is provided in a portion of the housing that is located between the communication port and the air hole in the up-down direction, the opening portion communicating the valve chamber with the outside of the housing;
An intake and exhaust valve, characterized in that a plug for closing the opening is removably attached to the opening. The connecting pipe portion is coaxially connected to the standpipe,
The housing portion includes, as the opening, a first opening and a second opening which are different in position around an axis of the connecting pipe portion,
The first opening and the second opening are provided at the same height position in the up-down direction,
2. The intake and exhaust valve according to claim 1, wherein the first opening and the second opening are respectively provided with the plugs. The intake and exhaust valve according to claim 2, characterized in that the first opening and the second opening are located on opposite sides of the axis. a floating valve body arranged in the valve chamber so as to be capable of rising and falling and configured to open and close the air hole;
a secondary air hole provided on the floating valve body for communicating the air hole with the communication port;
a float that is disposed in the valve chamber in a state capable of contacting the floating valve element from below and that rises and falls with the rise and fall of the water level in the valve chamber;
a valve mechanism that opens and closes the secondary air hole by movement of the float,
4. The intake and exhaust valve according to claim 1, wherein when the floating valve body closes the air hole with the valve mechanism closing the auxiliary air hole, the water surface reaches the opening. 5. The intake and exhaust valve according to claim 4, wherein when the floating valve body closes the air hole with the valve mechanism closing the auxiliary air hole, the water surface is located above the opening. The intake and exhaust valve according to claim 4 or 5, characterized in that the valve mechanism comprises a valve body held by the floating valve body in a state in which it can be displaced between a closed position that closes the secondary air hole and an open position that opens the secondary air hole, and a link mechanism that maintains the valve body in the closed position when the float is in contact with the floating valve body and moves the valve body to the open position when the float moves downward away from the floating valve body. The auxiliary air hole penetrates the floating valve body in the up- down direction,
the valve mechanism includes a valve seat surrounding a lower end opening of the secondary air hole and a valve portion provided on an upper surface of the float,
6. The intake and exhaust valve according to claim 4, wherein the float moves, when in contact with the floating valve body, between a closed position in which the valve portion abuts against the valve seat to close the auxiliary air hole, and an open position in which a gap is formed between the valve portion and the valve seat.

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