JP4748804B2 - Pressure reducing valve with check valve function - Google Patents

Description

The present invention relates to a pressure reducing valve with a check valve function.

Primary side passage, secondary side passage, valve body that variably adjusts the flow area at the boundary between the primary side passage and the secondary side passage, and biasing the valve body in the valve closing direction by receiving secondary pressure A pressure reducing valve assembly comprising: a pressure reducing valve provided with a diaphragm for energizing the valve body in a valve opening direction; and a check valve disposed upstream of the pressure reducing valve with respect to a fluid flow. It is disclosed in Patent Document 1.
According to the pressure reducing valve assembly of Patent Document 1, the secondary pressure of the pressure reducing valve is reduced from the primary pressure and maintained below a predetermined value. When the internal pressure of the flow path upstream of the pressure reducing valve assembly is lower than the internal pressure of the flow path downstream of the pressure reducing valve assembly, the flow path upstream of the pressure reducing valve in the pressure reducing valve assembly is checked. The valve closes. As a result, it is possible to prevent a situation in which water existing in the flow path downstream of the pressure reducing valve assembly flows backward to the flow path upstream of the pressure reducing valve assembly beyond the pressure reducing valve assembly.
JP 2006-048549 A

The pressure reducing valve assembly of Patent Document 1 has a problem that it is difficult to reduce the size because the pressure reducing valve and the check valve are separate.
The present invention has been made in view of the above problems, and provides a valve device having a pressure reducing valve function and a check valve function, which is smaller than the pressure reducing valve assembly of Patent Document 1. Objective.

In order to solve the above problems, in the present invention, a primary side passage, a secondary side passage, a valve body that variably adjusts a flow passage area at a boundary portion between the primary side passage and the secondary side passage, A diaphragm that receives pressure to urge the valve body in the valve closing direction, and a first spring that urges the valve body in the valve opening direction. The valve body is provided with an urging force by the secondary pressure and the first spring. A base that receives force, a valve body with a bellowram that is attached to the base and is biased in the valve opening direction by the dynamic pressure of the fluid flowing from the primary side passage to the secondary side passage, and a valve with the bellowram that is engaged with the base A pressure reducing valve with a check valve function is provided, comprising a second spring that biases the main body in the valve closing direction.

In the pressure reducing valve according to the present invention, when the fluid flows from the primary side passage to the secondary side passage, the valve body with the bellophram that receives the dynamic pressure of the fluid resists the urging force of the second spring in the valve opening direction. It is displaced. In this state, the valve body according to the magnitude relationship between the urging force of the secondary pressure, which is the internal pressure of the secondary side passage applied to the valve body via the diaphragm, and the urging force applied to the valve body from the first spring. Moves in the valve opening direction and the valve closing direction, and the secondary pressure is reduced from the primary pressure, which is the internal pressure of the primary passage, and is maintained below a predetermined value.
When the primary pressure becomes equal to or lower than the secondary pressure, the flow of fluid from the primary side passage to the secondary side passage stops, and the dynamic pressure of the fluid applied to the valve body with the bellophram becomes zero. As a result, the valve body with the belofram that receives the urging force of the second spring is displaced in the valve closing direction, and the pressure reducing valve is closed. Even if the secondary pressure drops and the valve body that receives the biasing force of the first spring moves in the valve opening direction, the valve body with the bellophram that receives the biasing force of the second spring displaces in the valve closing direction and reduces the pressure. The closed state of the valve is maintained. As a result, the occurrence of a situation in which the fluid downstream of the pressure reducing valve flows backward to the upstream side of the pressure reducing valve is prevented.
Since the pressure reducing valve according to the present invention has a pressure reducing valve function and a check valve function, the pressure reducing valve is reduced in size as compared with the pressure reducing valve assembly of Patent Document 1 provided with a check valve separately from the pressure reducing valve. ing.
The valve body of the pressure reducing valve is opened in the valve opening direction by a base that receives the biasing force of the secondary pressure and the biasing force of the first spring, and the dynamic pressure of the fluid that is attached to the base and flows into the secondary side passage By configuring the valve body with the bellophram to be biased and the second spring that is engaged with the base and biases the valve body with the bellowram in the valve closing direction, the pressure reducing valve does not increase in size. A check valve function can be added.

In a preferred aspect of the present invention, the pressure reducing valve includes a cylinder, a piston head that reciprocates in the cylinder, a first piston rod that extends from one end surface of the piston head and projects out of the cylinder from one end of the cylinder, and a cylinder An annular valve seat formed at one end of the first piston rod, a valve body disposed at one end of the first piston rod projecting out of the cylinder and facing the valve seat, and a portion of the cylinder peripheral wall facing the first piston rod A formed valve inlet, a second piston rod extending from the piston head and projecting out of the cylinder from the other end of the cylinder, and a diaphragm having a central portion fixed to one end projecting from the other end of the cylinder of the second piston rod; A diaphragm case that forms a pressure-sensitive chamber in cooperation with the diaphragm, cylinder, and piston head facing the diaphragm, and the pressure-sensitive chamber and the secondary A communication passage that communicates with the passage; a first spring that presses the diaphragm toward the pressure sensing chamber; a spring case that houses the first spring and cooperates with the diaphragm case to sandwich the peripheral edge of the diaphragm; A pressure reducing valve body having a primary side opening facing the inlet and a secondary side opening facing the valve body, wherein the valve body has a base portion having one end protruding out of the cylinder of the first piston rod, and an inner peripheral edge portion Has a valve body with a bellophram fixed to the base portion, and a second spring that engages with the base portion and biases the valve body with the bellophram in the valve closing direction.
With the above configuration, a valve device that has a pressure reducing valve function and a check valve function and is smaller than the pressure reducing valve assembly of Patent Document 1 is specifically provided.

In a preferred aspect of the present invention, the pressure reducing valve includes a cylinder, a piston head that reciprocates in the cylinder, a first piston rod that extends from one end surface of the piston head and projects out of the cylinder from one end of the cylinder, and a cylinder An annular valve seat formed at one end of the first piston rod, a valve body disposed at one end of the first piston rod projecting out of the cylinder and facing the valve seat, and a portion of the cylinder peripheral wall facing the first piston rod A formed valve inlet, a second piston rod extending from the piston head and projecting out of the cylinder from the other end of the cylinder, and a diaphragm having a central portion fixed to one end projecting from the other end of the cylinder of the second piston rod; A diaphragm case that forms a pressure-sensitive chamber in cooperation with the diaphragm, the cylinder, and the piston head, facing the diaphragm, and a cylinder A communication passage that communicates the pressure sensing chamber and the secondary passage, a first spring that presses the diaphragm toward the pressure sensing chamber, a first spring that houses the first spring and cooperates with the diaphragm case to move the peripheral portion of the diaphragm. A pressure reducing valve cassette having a spring case for clamping, and a pressure reducing valve body having a primary side opening facing the valve inflow port and a secondary side opening facing the valve body, the valve body being a first piston rod A base having one end protruding out of the cylinder, a valve body with a bellows whose inner peripheral edge is fixed to the base, and a second spring that engages with the base and biases the valve body with the bellows in the valve closing direction. The pressure reducing valve cassette is detachably attached to the pressure reducing valve body with the cylinder of the pressure reducing valve cassette inserted into the pressure reducing valve body.
By configuring the pressure reducing valve with a pressure reducing valve cassette including a valve mechanism portion and a pressure reducing valve body to which the pressure reducing valve cassette is detachably attached, maintenance and inspection and replacement of the valve mechanism portion are facilitated.

In a preferred aspect of the present invention, the pressure reducing valve includes a strainer that is detachably attached to the cylinder and covers the valve inlet.
If the strainer is detachably attached to the pressure reducing valve cassette, the strainer can be maintained together when maintaining the pressure reducing valve cassette.

In a preferred aspect of the present invention, the cylinder, the diaphragm case, and the pressure reducing valve body are integrally formed.
The present invention can also be applied to a conventional pressure reducing valve in which a cylinder of a pressure reducing valve, a diaphragm case, and a pressure reducing valve body are integrally formed.

According to the present invention, a valve device having a pressure reducing valve function and a check valve function, which is smaller than the pressure reducing valve assembly of Patent Document 1, is provided.

A pressure reducing valve according to an embodiment of the present invention will be described.
As shown in FIG. 1, the pressure reducing valve A has a pressure reducing valve cassette 10 and a pressure reducing valve body 30.
The pressure reducing valve cassette 10 includes a cylinder 11, a piston head 12 that reciprocates in the cylinder 11, a first piston rod 13 that extends from one end surface of the piston head 12 and protrudes from one end of the cylinder 11 to the outside of the cylinder 11, An annular valve seat 14 formed at the one end of the cylinder 11 and a valve body 15 disposed at one end of the first piston rod 13 projecting out of the cylinder 11 and facing the valve seat 14 are provided.
The valve body 15 includes a flange 15a ₁ formed in the vicinity of one end of the first piston rod 13 projecting out of the cylinder 11, a nut 15a ₂ screwed into one end of the first piston rod 13 projecting out of the cylinder 11, a base 15a which is formed by first cylinder 11 outside fitted abutting washer 15a ₃ cooperate to the nut 15a ₂ in projecting one end to the outside of the piston rod 13, to a flange portion 15a ₁ and the washer 15a ₃ of the base portion 15a an annular-shaped bellofram with valve body 15b having been sandwiching the bellofram 15b ₁ of the inner peripheral edge portion which is fixed to the base 15a as part integrally formed, slidably outside fitted to the nut 15a ₂ a valve body pressing 15c which is in contact fixed to the conditioned valve body 15b bellofram one end in contact with the contact and the other end the valve body retainer 15c to the nut 15a _2, bellofram with valve body 1 b the valve closing direction, that is, a spring 15d for biasing direction toward the valve seat 14.
The pressure reducing valve cassette 10 includes a pair of valve inlets 16 formed at the bottom of a circumferential groove 11 a formed on the outer surface of a portion of the circumferential wall of the cylinder 11 facing the first piston rod 13, and the other end surface of the piston head 12. A second piston rod 17 extending from the other end of the cylinder 11 to the outside of the cylinder 11, a diaphragm 18 having a central portion fixed to one end protruding from the other end of the cylinder 11 of the second piston rod 17, and the diaphragm 18 A diaphragm case 20 that forms a pressure-sensitive chamber 19 in cooperation with the diaphragm 18, the cylinder 11, and the piston head 12, and a peripheral wall of the cylinder 11, and extends from the one end of the cylinder 11 toward the other end. A pair of pressure introducing holes 21 for guiding the secondary pressure of the pressure reducing valve A to the pressure sensitive chamber 19, and a spring 22 for pressing the diaphragm 18 toward the pressure sensitive chamber 19. A spring case 23 that houses the spring 22 and cooperates with the diaphragm case 20 to sandwich the periphery of the diaphragm 18, and a sliding contact portion between the piston head 12 and the inner peripheral surface of the cylinder 11 that is housed in the circumferential groove of the piston head 12. And an O-ring 25 accommodated in a circumferential groove formed on the outer peripheral surface of the cylinder 11.

The cylinder 11 and the diaphragm case 20 are integrally formed of resin.
Diaphragm case 20 and press-processed metal plate spring case 23 are coupled by screws, caulking, or the like.
The pair of pressure introducing holes 21 have an oval cross section and are disposed so as to face each other with the cylinder center axis X interposed therebetween. The pair of valve inlets 16 is formed by leaving the peripheral portion of the cylinder 11 forming the bottom wall of the circumferential groove 11a notched over a predetermined circumferential length, leaving the vicinity of the pressure guide hole 21 in a columnar shape with a sector shape. They face each other with the cylinder center axis X in between.
An annular groove 11b extending from the end surface on the other end side of the cylinder 11 to the center in the longitudinal direction is formed in the piston head sliding region of the cylinder 11 peripheral wall, and the peripheral wall of the cylinder 11 in the piston head sliding region is connected to the inner tube 11c and the outer side. A double tube comprising the tube 11d is formed. The annular groove 11 b communicates with the pressure guide hole 21.

The pressure reducing valve body 30 is made of resin. The pressure reducing valve body 30 communicates with the cylindrical portion 31 into which the cylinder 11 of the pressure reducing valve cassette 10 is inserted, the primary side opening 32 formed in the cylindrical portion 31 so as to face the valve inlet 16, and the primary side opening 32. It has an inlet cylinder part 33, a secondary side opening 34 formed in the cylinder part 31 so as to face the valve body 15, and an outlet cylinder part 35 communicating with the secondary side opening 34. An inner peripheral surface of the cylindrical portion 31 cooperates with a peripheral groove 11 a formed on the outer peripheral surface of the cylinder 11 to form an annular passage 36 outside the valve inlet 16.

The cylinder 11 of the pressure-reducing valve cassette 10 is inserted into the cylinder part 31 of the pressure-reducing valve body 30, and the pressure-reducing valve cassette 10 is prevented from coming off while the contact part between the cylinder 11 and the cylinder part 31 is sealed by the O-rings 25 and 26. A pressure reducing valve A is configured by being detachably attached to the pressure reducing valve body 30 using a pin 28.
The upstream end of the inlet cylinder portion 33 of the pressure reducing valve body 30 is connected to a water supply pipe (not shown) via a connection pipe (not shown).
The outlet cylinder portion 35 of the pressure reducing valve body 30 is connected to a water-related device (not shown) via a connection pipe (not shown).
The inlet cylinder 33, the primary side opening 32, the annular passage 36, the valve inlet 16, and the cylinder 11 s upstream of the annular gap between the valve seat 14 and the valve body 15 b with the bellowram forming the valve body 15. The internal space of the part facing the one piston rod 13 forms the primary passage of the pressure reducing valve A, and the pressure is reduced downstream from the annular gap between the valve seat 14 and the valve body 15b with the bellowram forming the valve body 15. The internal space of the valve body 30, the secondary side opening 34, and the outlet cylinder part 35 form a secondary side passage of the pressure reducing valve A.

In the pressure reducing valve A, water supplied from a water supply pipe (not shown) through a connection pipe (not shown) passes through the inlet cylinder portion 33 and the primary side opening 32, and the inner peripheral surface of the cylinder portion 31 and the circumferential groove 11a. And flows into the cylinder 11 through the valve inlet 16 from the annular passage 36 and flows toward the valve seat 14 through the cylinder 11 to form the valve seat 14 and the valve body 15. It flows out of the cylinder 11 through the annular gap between the valve body 15b with the bellophram, and flows out of the pressure reducing valve A through the secondary side opening 34 and the outlet cylinder portion 35.
The water flowing out from the pressure reducing valve A is supplied to a water-related device (not shown) through a connection pipe (not shown).
When running water passes through the annular gap between the valve seat 14 and the valve body 15b with the bellowram that forms the valve body 15, pressure loss occurs, and the running water is depressurized.

The secondary side passage communicates with the pressure sensing chamber 19 through the pressure guide hole 21 and the annular groove 11b, whereby the secondary pressure of the pressure reducing valve A, which is the water pressure in the secondary side passage, is applied to the diaphragm 18. The primary pressure of the pressure reducing valve A, which is the water pressure in the primary passage, is applied to the pressure sensitive chamber 19 by the O-ring 24 accommodated in the circumferential groove of the piston head 12 sealing the sliding contact portion between the piston head 12 and the cylinder 11. Is not transmitted and is not applied to the diaphragm 18.
When the secondary pressure rises for some reason, the diaphragm 18 is elastically deformed in the direction away from the valve seat 14 against the biasing force of the spring 22, and the second piston rod 17 fixed to the diaphragm 18 is eventually moved to the piston head 12, The first piston rod 13 follows the diaphragm 18 and moves to the diaphragm 18 side, and the valve body 15 approaches the valve seat 14. As a result, the annular gap between the valve seat 14 and the valve body 15 is narrowed, the pressure loss when flowing water passes through the annular gap increases, and the secondary pressure drops. Therefore, in the pressure reducing valve A, the secondary pressure is maintained below a predetermined value.

When water is flowing from the primary side passage to the secondary side passage, as shown in FIG. 2 (a), the valve body 15b with the bellophram that receives the dynamic pressure of the flowing water opens against the urging force of the spring 15d. It is displaced in the valve direction. In this state, according to the magnitude relationship between the biasing force of the secondary pressure applied to the valve body 15 via the diaphragm 18 and the biasing force applied to the valve body 15 from the spring 22, the valve body 15 is shown in FIG. It moves in the valve opening direction shown in a) and the valve closing direction shown in FIG. 2B, and the secondary pressure is reduced from the primary pressure and maintained below a predetermined value.
When the primary pressure decreases to a secondary pressure or less due to water breakage or the like, the water flow from the primary side passage to the secondary side passage stops, and the dynamic pressure of the flowing water applied to the valve body 15b with the bellophram becomes zero. Become. As a result, the valve body 15b with a bellowram that receives the urging force of the spring 15d is displaced in the valve closing direction and comes into contact with the valve seat 14, and the pressure reducing valve A is closed. As shown in FIG. 2C, even if the valve body 15 that has received the urging force of the spring 22 moves in the valve opening direction, the valve body with the bellophram that has received the urging force of the spring 15d. The state where 15b is displaced in the valve closing direction and is in contact with the valve seat 14 is maintained, and the valve closing state of the pressure reducing valve A is maintained. As a result, when the primary pressure becomes equal to or lower than the secondary pressure, the occurrence of a situation in which water present in the flow path downstream of the pressure reducing valve A flows back to the water supply pipe over the pressure reducing valve A is prevented. .

Since the pressure reducing valve A has a pressure reducing valve function and a check valve function, the pressure reducing valve A is smaller than the pressure reducing valve assembly of Patent Document 1 provided with a check valve separately from the pressure reducing valve.
The valve body 15 of the pressure reducing valve A includes a base 15a, a valve body 15b with a toroidal plate-like valve body 15b ₁ having a base 15a and a bellophram 15b ₁ whose inner peripheral edge is fixed to the base 15a. By engaging and configuring the valve body 15b with the bellophram with the spring 15d that urges the valve body 15b in the valve closing direction, that is, in the direction approaching the valve seat 14, the pressure reducing valve A can be easily reduced without causing an increase in size. A check valve function can be added to the valve A.
By configuring the pressure reducing valve A with the pressure reducing valve cassette 10 having the valve mechanism portion and the pressure reducing valve body 30 to which the pressure reducing valve cassette 10 is detachably attached, maintenance and inspection and replacement of the valve mechanism portion are facilitated.

A cylindrical strainer 27 that surrounds the circumferential groove 11 a and covers the valve inlet 16 may be detachably attached to the outer peripheral surface of the cylinder 11. By providing the strainer 27, the entry of foreign matter into the inside of the valve is prevented, and the pressure reducing valve A is protected. When the cylinder 11 of the pressure reducing valve cassette 10 is pulled out from the cylindrical portion 31 of the pressure reducing valve body 30 and the pressure reducing valve cassette 10 is maintained, the strainer 27 can be maintained together.

In the pressure reducing valve A, the pressure reducing valve cassette 10 is separated from the pressure reducing valve body 30, and the pressure reducing valve cassette 10 is detachably attached to the pressure reducing valve body 30, but the cylinder 11 and the diaphragm case forming the pressure reducing valve cassette 10 are provided. 20 and the cylinder part 31, the inlet cylinder part 33, and the outlet cylinder part 35 which form the pressure-reducing valve body 30 may be integrally formed to form an integral body.

The present invention is widely applicable to pressure reducing valves for various water-related equipment.

1 is a structural diagram of a pressure reducing valve according to an embodiment of the present invention. (A) is sectional drawing, (b) is a bb arrow line view of (a). In addition, (a) is an aa arrow directional view of (b). It is a partial expanded sectional view which shows the action | operation of the pressure reducing valve which concerns on Example 1 of this invention. (A) is a cross-sectional view when the valve is opened, (b) is a cross-sectional view when the valve is closed, and (c) is a cross-section when the primary pressure becomes lower than the secondary pressure, that is, when the check valve operates. FIG.

Explanation of symbols

A Pressure-reducing valve 10 Pressure-reducing valve cassette 11 Cylinder 12 Piston head 13 First piston rod 14 Valve seat 15 Valve body 15a Base portion 15b Valve body 15d with bellows Spring 17 Second piston rod 18 Diaphragm 19 Pressure sensing chamber 20 Diaphragm case 22 Spring 30 Depressurization Valve body 31 Tube 33 Inlet tube portion 35 Outlet tube portion

Claims (5)

Primary side passage, secondary side passage, valve body that variably adjusts the flow area at the boundary between the primary side passage and the secondary side passage, and biasing the valve body in the valve closing direction by receiving secondary pressure And a first spring that biases the valve body in the valve opening direction, the valve body receiving a biasing force due to the secondary pressure and a biasing force of the first spring, and a primary side attached to the base A valve body with a bellows that is biased in the valve opening direction by the dynamic pressure of the fluid flowing from the passage into the secondary side passage, and a second spring that is engaged with the base and biases the valve body with the bellows in the valve closing direction A pressure reducing valve with a check valve function. A cylinder, a piston head that reciprocates in the cylinder, a first piston rod that extends from one end face of the piston head and protrudes from one end of the cylinder to the outside of the cylinder, and an annular valve seat formed at the one end of the cylinder A valve body that is disposed at one end of the first piston rod protruding from the cylinder and faces the valve seat, a valve inlet formed at a portion of the cylinder peripheral wall facing the first piston rod, and extending from the piston head A second piston rod protruding from the other end of the cylinder to the outside of the cylinder, a diaphragm having a central portion fixed to one end protruding from the other end of the cylinder of the second piston rod, and the diaphragm, the cylinder, and the piston head in cooperation with the diaphragm A diaphragm case that works to form a pressure sensing chamber, a communication passage that connects the pressure sensing chamber and the secondary passage, and a diaphragm; A first spring that presses toward the pressure-sensitive chamber; a spring case that houses the first spring and holds the peripheral edge of the diaphragm in cooperation with the diaphragm case; and a primary-side opening and valve body that faces the valve inlet A pressure reducing valve body having a secondary side opening facing the valve body, the valve body including a base portion having one end protruding out of the cylinder of the first piston rod, and a valve body with a bellophram having an inner peripheral edge portion fixed to the base portion; The pressure reducing valve with a check valve function according to claim 1, further comprising a second spring that engages with the base portion and biases the valve body with the belofram in the valve closing direction. A cylinder, a piston head that reciprocates in the cylinder, a first piston rod that extends from one end face of the piston head and protrudes from one end of the cylinder to the outside of the cylinder, and an annular valve seat formed at the one end of the cylinder A valve body that is disposed at one end of the first piston rod protruding from the cylinder and faces the valve seat, a valve inlet formed at a portion of the cylinder peripheral wall facing the first piston rod, and extending from the piston head A second piston rod protruding from the other end of the cylinder to the outside of the cylinder, a diaphragm having a central portion fixed to one end protruding from the other end of the cylinder of the second piston rod, and the diaphragm, the cylinder, and the piston head in cooperation with the diaphragm A diaphragm case that works to form a pressure sensitive chamber, and a communication that is formed in the cylinder to communicate the pressure sensitive chamber and the secondary passage And a pressure reducing valve cassette having a first spring that presses the diaphragm toward the pressure sensing chamber, a spring case that accommodates the first spring and cooperates with the diaphragm case to sandwich the periphery of the diaphragm, and the valve inlet A pressure reducing valve body having a primary side opening facing the valve body and a secondary side opening facing the valve body, the valve body having a base portion having one end protruding out of the cylinder of the first piston rod, and an inner peripheral edge portion A valve body with a bellophram fixed to the base portion and a second spring that engages with the base portion and biases the valve body with the bellophram in the valve closing direction, and the cylinder of the pressure reducing valve cassette is inserted into the pressure reducing valve body 2. The pressure reducing valve with a check valve function according to claim 1, wherein the pressure reducing valve cassette is detachably attached to the pressure reducing valve body. The pressure reducing valve with a check valve function according to claim 3, further comprising a strainer that is detachably attached to the cylinder and covers the valve inlet. The pressure reducing valve with a check valve function according to claim 2, wherein the cylinder, the diaphragm case, and the pressure reducing valve body are integrally formed.

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