JPH0747995B2 - Constant water level valve of water supply tank water supply piping system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a constant water level valve for a water supply tank water supply piping system.

[Conventional technology]

Conventionally, the piping system for supplying water to the water receiving tank has a configuration as shown in FIG.

In FIG. 3, 1 is a water receiving tank, 2 is a main water supply pipe for supplying water to the water receiving tank 1, and a constant water level valve 3 which is opened and closed by pilot water pressure is provided in the middle of the main water supply pipe 2. Reference numeral 4 denotes a pilot pipe branched from the constant water level valve 3 and introduced into the water receiving tank 1. In the middle of this pilot pipe 4, the pilot pipe 4 is opened and closed electromagnetically according to the water level in the water receiving tank 1. An electromagnetic pilot valve 5 for controlling the flow of the flowing pilot water is provided. The pilot valve 5 is opened by the pilot valve control device 6 when the water level in the water receiving tank 1 drops to the water supply start water level L ₁ ,
When the water level in the water receiving tank 1 reaches the water supply stop water level L ₂ , the pilot valve control device 6 closes the water.
A water level detector 7 is provided in the water receiving tank 1, and the water level detector 7 is connected to the pilot valve control device 6.

The structure of the constant water level valve 3 will be described. As shown in FIG. 4, the constant water level valve 3 includes a valve body 12 having an inflow port 10 and an outflow port 11 to which the main water supply pipe 2 is connected. A water passage 13 is provided between the inflow port 10 and the outflow port 11.
A partition wall 14 is provided on the way, and a valve port 15 is formed in the partition wall 14. A pilot chamber 17 is formed in the upper portion of the valve body 12, and the pilot chamber 17 is detachably attached to the upper end of the valve body 12 and is sealed by a lid body 18, and a cylinder 19 is housed in the pilot chamber 17. There is. A valve unit is provided from the pilot chamber 17 to the water passage 13.
20 are provided. The valve unit 20 includes a piston 21 vertically movably housed in the cylinder 19 and a rod attached to the piston 21 and slidably penetrating a bottom wall of the cylinder 19 and protruding into the water passage 13. 22 and a valve element 23 attached to the lower end of the rod 22 so as to face the valve opening 15, and a packing 24 is attached to the peripheral surface of the piston 21. Then, the packing 24 slidably contacts the inner peripheral surface of the cylinder 19, whereby the inside of the pilot chamber 17 becomes a first pressure chamber 25 on the upper side of the piston 21 and a second pressure chamber 26 on the lower side. Liquid-tight partition. An opening 27 larger than the outer diameter of the valve body 23 is formed on the bottom surface of the pilot chamber 17.

The first pressure chamber 25 communicates with the water passage 13 on the inflow port 10 side through a pilot passage 28 having a small diameter formed from the valve body 12 to the lid 18, and the second pressure chamber 26 is A water passage on the inlet 10 side through a notch groove 29 formed on the side surface of the rod 22.
It communicates with 13. A pipe connecting portion 30 is provided on the lid body 18, and the pilot pipe 4 is detachably connected to the pipe connecting portion 30. The pilot pipe 4 is provided with the first pressure chamber 25.
Are in communication.

The constant water level valve 3 configured as described above responds to the opening / closing operation of the pilot valve 5 according to the water level in the water receiving tank 1
It supplies water to and stops it. That is, the water from the water source flows into the water passage 13 through the inflow port 10, and a part of this water flows as the pilot water through the pilot flow passage 28 into the first pressure chamber 25 of the pilot chamber 17 and the other part thereof. Each of the second pressure chambers 26 flows into each of the second pressure chambers 26 through the cutout grooves 29 to be filled. If the pilot valve 5 is open here, the pilot water that has flowed into the first pressure chamber 25 further flows through the pilot pipe 4 in sequence and flows out into the water receiving tank 1. The pressure in the first pressure chamber 25 is lower than the pressure in the first pressure chamber 26, whereby the valve body unit 20 rises, the valve body 23 separates from the valve opening 15, and the valve opening 15 opens. As a result, the main water supply pipe 2
Water is sequentially supplied to the water receiving tank 1 through the.

Then, when the water level of the water receiving tank 1 reaches the water supply stop water level L ₂ and the pilot valve 5 is closed, the flow of pilot water flowing through the pilot pipe 4 is stopped and the pressure in the first pressure chamber 25 rises. As a result, the valve unit 20 descends, the valve body 23 closes the valve port 15, and water supply to the water receiving tank 1 is stopped. Further, when the water level in the water receiving tank 1 again drops to the water supply start water level L ₁ and the pilot valve 5 opens, the pilot water flows and the pressure in the first pressure chamber 25 decreases, and the valve unit 20
Rises, the valve port 15 is opened, water is supplied into the water receiving tank 1 through the main water supply pipe 2, and the water level in the water receiving tank 1 is kept substantially constant by such repetition.

A ball tap 31 is provided at the tip of the pilot pipe 4, and when the pilot valve 5 is not properly controlled to open and close due to a power failure or failure, the ball tap 31 controls the flow of pilot water. .

As shown in FIG. 3, the main water supply pipe 2 is provided with manual sluice valves 32a, 32b on both sides thereof so as to sandwich the constant water level valve 3, and these sluice valves 32a, 32b and a constant sluice valve 32a, 32b are provided. A bypass pipe 33 is connected so as to straddle the water level valve 3, and a manual water shutoff valve 34 is provided in the middle of the bypass pipe 33. Further, the main water supply pipe 2 is provided with a manual water shutoff valve 35 on the inflow side of the bypass pipe 33 and a manual drain valve 36 on the outflow side.

At normal times, the water shutoff valve 35 and the sluice valves 32a and 32b of the main water supply pipe 2 are opened, and the water shutoff valve 34 of the bypass pipe 33 and the drainage valve 36 of the main water supply pipe 2 are closed, and therefore the water receiving tank 1 Water is sequentially supplied to the inside through the constant water level valve 3.

By the way, when the packing 24 of the valve unit 20 and the valve body 23 in the constant water level valve 3 are deteriorated due to secular change or the like and these are replaced, first, the water shutoff valve 35 is closed and the drain valve 36 is opened. . Accordingly, the water in the main water supply pipe 2 on the downstream side of the water shutoff valve 35 is discharged through the drainage valve 36. Therefore, after performing such drainage work, the sluice valves 32a, 32b and the drainage valve 36 are connected. In the closed state, the pilot pipe 4 is disconnected from the pipe connection portion 30 of the lid body 18 in this state, and the lid body 18 is removed from the valve body 12. As a result, the upper surface of the pilot chamber 17 is opened, so the valve unit 20 in the valve body 12 is pulled out through this pilot chamber 17 and packed.
Replace 24 and valve body 23. And when it is necessary to supply water into the water receiving tank 1 between such operations,
The water stop valve 35 is manually opened, and water is supplied from the bypass pipe 33 through the main water supply pipe 2 into the water receiving tank 1.

However, in such a conventional constant water level valve,
When removing the valve unit from the inside of the valve body, first remove the pilot pipe from the pipe connection part of the lid body, then remove the lid body from the valve body and open the upper end of the valve body, which makes the work complicated. It becomes troublesome.

Therefore, as seen in JP-A-2-51681, a pipe connecting portion to which a pilot pipe is connected is provided on the side surface of the valve body,
A constant water level valve has been proposed in which the valve unit in the valve body can be pulled out only by removing the lid body from the valve body.

[Problems to be Solved by the Invention]

However, in the constant water level valve disclosed in Japanese Patent Laid-Open No. 2-51681, the pipe connecting portion is simply in communication with the inside of the valve body, and therefore the lid body is removed and the upper end of the valve body is removed. When the valve unit is opened by pulling out the valve unit, the water in the pilot pipe connected to the pipe connecting portion overflows from the upper end of the valve body due to a drop, which makes it difficult to pull out the valve unit.

The present invention has been made paying attention to such a point, and the purpose thereof is to prevent the overflow of water in the pilot pipe when the lid body is removed from the valve body and to remove the valve unit. An object is to provide a constant water level valve of a water supply tank water supply piping system that can be easily and efficiently performed.

[Means for Solving the Problems]

In order to achieve such an object, the present invention operates a valve unit by a pressure fluctuation in a pilot chamber by controlling the flow of water flowing through a pilot pipe, and operates the valve unit to flow water from a water source. The water passage inside is opened and closed, and the supply of water to the water receiving tank is controlled by opening and closing the water passage. The pilot chamber is sealed with a lid, and the valve unit is inserted into the valve body through the pilot chamber. In the constant water level valve in which is installed, a pilot pipe connecting portion to which the pilot pipe is connected is formed in the valve body, and the pilot pipe connecting portion is provided with the first and second communication passages in the pilot chamber and the water passage. And a valve mechanism that is normally closed and that is opened in accordance with the closing operation of the water shutoff valve between the water passage and the water source. It is.

[Action]

When changing the packing of the valve unit or the valve body,
Close the stop valve to stop the water flowing from the water source to the water passage of the valve body. In response to this, the valve mechanism provided in the second communication passage that connects the pilot pipe connection portion and the water passage is opened, and by this opening, water in the pilot pipe is discharged through the second communication passage. Under such a condition, the lid is removed from the valve body and the valve unit is pulled out from the valve body. Even if the lid is removed from the valve body, the water in the pilot pipe is discharged through the second communication passage, so that it does not leak from the removed portion of the lid.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same parts as those of the conventional structure are designated by the same reference numerals and the description thereof will be omitted.

In the constant water level valve 3 of the present invention, the valve main body 12 has a pipe connecting portion.
37 is provided, and the pilot pipe 4 is connected to the pipe connection portion 37. The pipe connecting portion 37 communicates with the pilot chamber 17 through the first communication passage 38 formed in the lid 18, and also through the second communication passage 39 formed in the valve body 12 to the water passage 13 on the outlet 11 side. Is in communication with. A valve mechanism 40 for opening and closing the second communication passage 39 is provided in the second communication passage 39. The valve mechanism 40 includes a cylinder 41 inserted in the second communication passage 39 and a valve body housed in the cylinder 41.
42 and a valve opening 43 is formed in the upper part of the cylinder 41,
A packing 44 for a valve seat is mounted on the upper edge of the valve opening 43. The valve body 42 is composed of a shaft portion 45 and a valve portion 46 formed at the upper end portion of the shaft portion 45, and the shaft portion 45 slidably penetrates a holder 47 provided at the lower end portion of the cylinder 41, Also valve
The valve 46 is arranged above the valve port 43, and is formed in an inverted truncated cone shape having a flat upper surface and a tapered lower surface. The entire valve body 42 is elastically biased upward by a spring 48, and a plurality of openings 49 are formed in the lower peripheral surface of the cylinder 41.
... is formed.

In such a configuration, when the pilot valve 5 is opened, a part of the water flowing through the water passage 13 flows into the first pressure chamber 25 of the pilot chamber 17 from the pilot flow passage 28 as pilot water in the same manner as described above. Further, this pilot water sequentially flows from the first communication passage 38 through the pipe connecting portion 37 in the pilot pipe 4. Further, as the pilot valve 5 is closed, the flow of pilot water is stopped and the pressure in the first pressure chamber 25 of the pilot chamber 17 rises. Due to such pressure fluctuations in the pilot chamber 17, the same as described above. Water supply to the water receiving tank 1 is controlled. And under such conditions, the pilot room
The valve body of the valve mechanism 40 is determined by the difference between the pressure on the 17 side and the pressure on the water passage 13 side.
42 is pressed downward against the spring 48, and the pressing force keeps the lower surface of the valve portion 46 in close contact with the packing 44 and keeps the valve opening 43 closed.

On the other hand, when the packing 24 and valve body 23 of the valve unit 20 are deteriorated and are to be replaced, first of all, the water shutoff valve
Close 35. With the closing of the water shutoff valve 35, the pressure on the pilot chamber 17 side and the pressure on the water passage 13 side become almost equal, so the valve element 42 of the valve mechanism 40 is pushed up by the urging force of the spring 48, and the valve portion 46 is separated from the packing 44 and the valve port 43, that is, the second communication passage 39 is opened. After this, the drain valve 36 is opened. By this opening, the water in the main water supply pipe 2 on the downstream side of the water shutoff valve 35 is discharged through the drain valve 36, and the water in the pilot pipe 4 is further discharged from the joint pipe 37 to the second communication passage 39, the water passage 13, the drainage. It is discharged to the outside of the valve body 12 through the valve 36.

After that, the sluice valves 32a and 32b and the drain valve 36 are closed, and in this state, the lid 18 is removed from the valve body 12, and the pilot chamber 17
Open the upper surface of. At this time, the water in the pilot pipe 4 has already been discharged through the second communication passage 39, the water passage 13, and the drain valve 36. Therefore, when the lid 18 is removed from the valve body 12, The water does not overflow from the open portion of the upper surface of the pilot chamber 17. For this reason, the valve unit 20 in the valve body 12 can be easily and conveniently removed to efficiently replace the packing 24, the valve body 23, and the like. When it is necessary to supply water into the water receiving tank 1 between such operations, the water shutoff valve 35 is manually opened, and water is supplied from the bypass pipe 33 to the water receiving tank 1 through the main water supply pipe 2. Do.

〔The invention's effect〕

As described above, according to the present invention, the water in the pilot pipe does not overflow from the inside of the valve main body when the lid is removed from the valve main body, and therefore the valve unit can be easily and efficiently extracted. There is an advantage that can be done.

[Brief description of drawings]

FIG. 1 is a sectional view of a constant water level valve according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a water receiving tank water supply piping system using the constant water level valve, and FIG. 3 is a conventional water receiving tank water supply piping system. FIG. 4 is a sectional view of a constant water level valve used in the water receiving tank water supply piping system. 1 ... Water tank, 3 ... Constant water level valve, 4 ... Pilot piping, 12 ... Valve body, 13 ... Water passage, 17 ... Pilot room, 18 ... Lid, 20 ... Valve unit, 37 ...... Piping connection, 38 ...... First communication passage, 39 ...... Second communication passage, 40 ......
Valve mechanism.

Claims (1)

[Claims] Claim: What is claimed is: 1. A valve unit is operated by a pressure fluctuation in the pilot chamber by controlling the flow of water flowing through the pilot pipe, and the operation of the valve unit opens and closes a water passage in the valve main body for circulating water from a water source. A constant water level valve for controlling the supply of water to the receiving tank by opening and closing the water passage, wherein the pilot chamber is sealed with a lid, and the valve unit is incorporated in the valve body through the pilot chamber. In the valve body, a pilot pipe connecting portion to which the pilot pipe is connected is formed, and the pilot pipe connecting portion is made to communicate with the pilot chamber and the water passage through the first and second communication passages, respectively. A constant water level of the water receiving tank water supply piping system, characterized in that the communication passage of 2 is provided with a valve mechanism which is normally closed and is opened according to the closing operation of the water stop valve between the water passage and the water source. .