JPH04181078A - Constant water level valve in water supply pipe system for water receiving tank - Google Patents

Abstract

PURPOSE:To easily pull out a valve unit from the inside of a valve body by installing a valve for selectively switching the first valve port on the inflow side and a water stop valve port and selecting the water flow passage between a water passage and a bypass passage. CONSTITUTION:A bypass passage 40 is formed in parallel to a water passage 13 in a valve body 12, and is equipped with the first valve port 41 on a flow inlet 10 side, and is equipped with the second valve port 42 on an effluence port 11 side. The water passage 13 has a water stop valve port 43 on the flow inlet side, and communicates to a flow inlet 10 through the valve port 43. A selector valve 44 for selectively opening and closing the valve ports 41 and 43 is installed between the first valve port 41 and the water stop valve port 43, and in the ordinary case, the bypass passage 40 is closed, and the water supplied from the flow inlet 10 is introduced into the water passage 13, and controlled by a pilot valve 5, and water supply is performed. When the water passage 13 is closed and the bypass passage 40 is opened by operating the selector valve 44, a pressure valve 47 rises, and water is supplied from the effluence port 11 through the second valve port 42. At this time, water does not exist in the water passage 13, and a valve unit 20 can be taken out.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a constant water level valve for a water tank water supply piping system.

[Conventional technology]

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

In Fig. 4, 1 is a water tank, and 2 is a main water supply pipe that supplies water to the water tank 1.
A constant water level valve 3 that is opened and closed by pilot water pressure is provided. 4 is a pilot pipe branched from the constant water level valve 3 and introduced into the water receiving tank 1;
An electromagnetic pilot valve 5 that is electromagnetically opened and closed according to the water level in the water tank 1 to control the flow of the pilot chamber through the pilot pipe 3 is provided in the middle.

This pilot valve 5 is opened by the pilot valve control device 6 when the water level of the water receiving tank 1 has fallen to the water supply start water level L1, and the pilot valve is controlled when the water level of the water receiving tank 1 reaches the water supply stop water level L2. It is designed to be closed by a device 6. Note that 7 is a water level detector provided in the water tank 1, and this water level detector 7 is connected to the pilot valve control device 6.
It is connected to the.

To explain the structure of the constant water level valve 3, as shown in FIG. Between the inlet 10 and the outlet 11 is a water passage 13,
A partition wall 14 is provided in the middle of this water passage 13, and a valve port 15 is formed in this partition wall 14. A pilot chamber 17 is formed in the upper part of the valve body 12, this pilot chamber 17 is removably 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 this pilot chamber 17. There is. And this pilot room 17
A valve unit 20 is provided extending from the inside of the water passageway 13. This valve unit 20 includes a piston 21 housed in one of the cylinders so as to be movable up and down, and a piston 21 that is attached to the piston 21 and extends slidably through the bottom wall of the cylinder 19 and protrudes into the water passage 13. It consists of a rod 22 and a valve body 23 attached to the lower end of the rod 22 facing the valve port 15, and a backing 24 is attached to the circumferential surface of the piston 18. Then, the backing 24 comes into sliding contact with the inner peripheral surface of the cylinder 19, so that the inside of the pilot chamber 17 is connected to the first pressure chamber 25 on the upper side of the piston 21 and the second pressure chamber 26 on the lower side. Liquid-tightly partitioned. Note that an opening 27 larger than the outer diameter of the valve body 23 is formed in the bottom surface of the pilot chamber 17.

The first pressure chamber 25 communicates with the water passage 13 on the inlet 10 side via a small diameter pilot flow path 28 formed from the valve body 12 to the lid 18, and the second pressure chamber 26 communicates with the water passage 13 on the inlet 10 side. The rod 22 communicates with the water passage 13 on the inlet 10 side through a notched groove 29 formed on the side surface of the rod 22 . The lid body 18 is provided with a pipe connection part 30, a pilot pipe 4 is detachably connected to the pipe connection part 30, and the first pressure chamber 25 communicates with the pilot pipe 4.

The constant water level valve 3 configured in this way opens and closes the water tank 1 in response to the opening/closing operation of the pilot valve 5 depending on the water level in the water tank 1.
This is used to supply and stop water to the area. That is, water from the water source flows into the water passage 13 through the inlet 10,
A portion of this water is used as pilot water in the pilot flow path 28.
Through the first pressure chamber 25 of the pilot chamber 17, the other part flows into the second pressure chamber 26 through the cutout groove 29, and the other part flows into the second pressure chamber 26 and is filled. If the pilot valve 5 is open here, the pilot water that has flowed into the first pressure chamber 25 will further flow through the pilot piping 4 sequentially and flow out into the water receiving tank 1. The pressure in the first pressure chamber 25 decreases below the pressure in the first pressure chamber 26, which causes the valve body unit 20 to rise, and the valve body 2
3 is separated from the valve port 15 and the valve port 15 is opened, whereby the water receiving tank 1 is sequentially passed from the water passage 13 to the main water supply pipe 2.
Water is supplied inside.

When the water level in the water tank 1 reaches the water supply stop level L2 and the pilot valve 5 closes, the pilot water flowing through the pilot pipe 4 stops and the pressure in the first pressure chamber 25 increases, and this increase causes The valve unit 20 is lowered, the valve body 23 closes the valve port 15, and water supply to the water tank 1 is stopped. When the water level in the water tank 1 falls to the water supply start water level L1 again and the pilot valve 5 opens, the pilot water circulates and the pressure in the first pressure chamber 25 decreases, causing the valve unit 20 to rise and open the valve. The port 15 is opened and water is supplied into the water tank 1 through the main water supply pipe 2. By repeating this process, the water level in the water tank 1 is kept almost constant.

Note that a pole tap 31 is installed at the tip of the pilot pipe 4.
This pole tap 3
1 controls the flow of pilot water.

As shown in FIG. 4, the main water supply pipe 2 has manual gate valves 32a, 32 on both sides of the constant water level valve 3.
b are provided, and these gate valves 32a, 3
A bypass pipe 33 is connected so as to straddle the water valve 2b and the constant water level valve 3, and a manual water stop 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 stop valve 35 on the water inflow side to the bypass pipe 33.

Under normal conditions, the water stop valve 35 and gate valves 32a, 32b of the main water supply pipe 2 are open, and the water stop valve 34 of the bypass pipe 33 is closed. Water is provided.

By the way, when the backing 24, valve body 23, etc. of the valve unit 20 in the constant water level valve 3 have deteriorated due to changes over time and are to be replaced, first close the water stop valve 35 of the main water supply pipe 2, and then Next, the gate valve 32a,
32b is closed, and in this state, the pilot pipe 4 is connected to the lid body 1.
8 from the piping connection part 30, and then remove the lid 18 from the valve body 12. This opens the upper surface of the pilot chamber 17, so the valve unit 20 inside the valve body 12 is removed through the pilot chamber 17, and the backing 24 is removed.
and the valve body 23. During such work, the water stop valve 34 of the bypass pipe 33 is opened, and in this state, the water stop valve 35 of the main water supply pipe 2 is manually opened/closed, and water is supplied from the bypass pipe 33 through the main water supply pipe 2. Water is appropriately supplied into the water tank 1.

[Problem to be solved by the invention]

However, in such a conventional configuration, when the gate valves 32a and 32b are provided on both sides of the constant water level valve, one
It is necessary to connect the bypass pipe 33 so as to straddle these gate valves 32a, 32b and the constant water level valve 3, and to provide a water stop valve 34 in the middle of the bypass pipe 33, which makes the structure complicated and expensive. , and the valve body 1 of the constant water level valve 3
When removing the valve unit 20 from inside the valve unit 2, it is necessary to close the gate valves 32a and 32b and open the water stop valve 34 of the bypass pipe 33, which makes the work troublesome and time-consuming. There is a drawback that efficiency decreases.

The present invention has been made with attention to these points, and its purpose is to provide a water receiving tank that has a simple structure and allows operations such as removing the valve unit from the valve body to be carried out easily and efficiently. An object of the present invention is to provide a constant water level valve for a water supply piping system.

[Means to solve the problem]

In order to achieve such an object, the present invention has an inlet at one end and an outlet at the other end, and an opening/closing valve in the middle of the passage between the inlet and the outlet. A valve unit is operated by pressure fluctuations in the pilot chamber by controlling the flow of water flowing through the pilot piping, and the operation of this valve unit opens and closes the opening/closing valve port. In the device for controlling the supply of water to a water receiving tank, a bypass passage parallel to the water passageway is integrally formed within the valve body, and an end of the water passageway on the inlet side communicates with the inflow port. A first valve port communicating with the inflow port is formed at an end of the bypass path on the inflow port side as a water stop valve port, and these valve ports are selectively opened and closed with respect to these valve ports. A manual switching valve is provided, a second valve port communicating with the outflow port is formed at the end of the bypass path on the outflow port side, and a switch valve is provided between the opening/closing valve port and the second valve port. A pressure valve is provided which opens the second valve port and closes the opening/closing valve port by water pressure in the bypass passage when the first valve port is opened.

[For production]

Under normal conditions, the bypass channel is closed by the first valve port or the switching valve, and water from the water source flows into the flow channel through the water stop valve port, and this water flow is controlled by the valve unit for opening and closing. Controlled by opening and closing the valve port.

Here, when performing maintenance and inspection of the valve unit, the switching valve is operated to open the first valve port of the bypass passage, and the switching valve closes the water stop valve port of the water passage. In response to such an operation, water from the water source flows into the bypass passage through the first valve opening, and the pressure of this water operates the pressure valve, opening the second valve opening of the bypass passage. , the valve for opening and closing the water passage is closed. and the second
When the valve opening is opened, the outflow port communicates with the main water supply pipe through the bypass passage or the second valve opening.In this state, open and close the water stop valve of the main water supply pipe to supply water from the water source through the bypass passage. Supply water to the water tank as appropriate.

Communication with the water source is cut off in the water passage by closing the water shutoff valve port and the opening/closing valve port, so in this state it is possible to remove the lid from within the valve body and pull out the valve unit. Become. After the maintenance and inspection of the valve unit is completed, the switching valve is operated to open the water shutoff valve port of the water flow channel and the first valve port of the bypass channel is closed, and water from the water source flows into the water flow channel. As the water flows inside, the pressure valve operates due to the decrease in water pressure in the bypass passage, and this operation opens the valve opening for opening and closing the water passage, and the second valve opening of the bypass passage is closed. Water flows through the water channel.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. Note that the same reference numerals are given to the parts corresponding to the conventional configuration, and the explanation thereof will be omitted.

In the constant water level valve 3 of the present invention, a bypass passage 40 is integrally formed in the valve body 12 in parallel with the water passage 13. This bypass passage 40 has a first valve port 41 at one end on the inflow port 10 side, and a second valve port 42 at the other end on the outflow port 11 side. 1 to the inflow port 10 through the second valve port 41.
2 and communicate with the outlet 11, respectively. The water passage 13 has an opening/closing valve port 15 that is opened/closed by a valve unit 20.
Separately, a water stop valve 43 is formed on the inlet 10 side, and the water passage 13 communicates with the inlet 10 through the valve 43, and the first valve in the bypass passage 40 The valve port 41 is arranged so as to be spaced apart from and opposite to the valve port 41 of the valve port 41 . A switching valve 44 is provided between the valve ports 41 and 43 to selectively open and close the valve ports 41 and 43. This switching valve 44 is attached to a valve shaft 45 screwed into the wall surface of the valve body 12, and is displaced up and down by turning the valve shaft 45 via a handle 46, and this displacement causes the bypass passage to be changed. It is designed to switch between a state in which it contacts the first valve port 41 of the water passageway 13 to seal it, and a state in which it contacts the water stop valve port 43 of the water passageway 13 to seal it.

The second valve port 42 of the bypass passage 40 is arranged to face and be spaced apart from the valve port 15 for opening and closing the water passage 13 .

A pressure valve 47 is provided between these valve ports 42 and 15 so as to be movable up and down. Normally, this pressure valve 47 comes into contact with the second valve port 42 of the bypass passage 40 to seal it, and when a certain water pressure is applied in the bypass passage 40, the pressure rises to close the second valve port 42 of the bypass passage 40. The opening 42 is opened, and the opening 42 is brought into contact with the valve opening 15 for opening and closing the water passage 13 to seal it.

In the constant water level valve 3 configured in this manner, as shown in FIG. 3, the main water supply pipe 2 is directly connected to the inlet 10 and the outlet 11. In normal times, as shown in FIG. 1, the bypass passage 40 is closed by the first valve port 41 or the switching valve 44, and water from the water source is supplied to the water stop valve port 43.
The water is maintained in a state where it flows into the water passageway 13 through the water passageway 13.

Under such conditions, when the pilot valve 5 is opened, part of the water flowing through the passageway 13 is discharged from the pilot chamber 1 as pilot water from the pilot passageway 28 in the same manner as described above.
The pilot water flows into the first pressure chamber 25 of the pilot chamber 17, and this pilot water sequentially flows into the pilot pipe 4, and when the pilot valve 5 is closed, the flow of the pilot water is stopped and the first pressure in the pilot chamber 17 is lowered. The pressure within the chamber 25 increases, and due to such pressure fluctuations within the pilot chamber 17, the valve port 15 is opened and closed via the valve unit 20, thereby controlling the water supply to the water receiving tank 1.

Here, when the backing 24, valve body 23, etc. of the valve unit 20 deteriorate and need to be replaced, the switching valve 44 is operated and the first valve port 41 of the bypass path 40 is replaced.
At the same time, the water stop valve port 43 of the water passage 13 is closed by the switching valve 44. In response to such an operation, water from the water source flows into the bypass passage 40 through the first valve port 41, and the pressure of this water causes the pressure valve 47 to rise and close the valve port 15 for opening and closing the water passage 13. As a result, the second valve port 42 of the bypass passage 40 is opened, and the valve port 15 for opening and closing the water passage 13 is closed. Then, by opening the second valve port 42, the inside of the bypass passage 40 is opened to the second valve port 42.
The outlet 11 communicates with the inside of the main water supply pipe 2 through the valve port 42 of the main water supply pipe 2. In this state, the water stop valve 35 of the main water supply pipe 2 is opened and closed, and the water from the water source is passed through the bypass passage 40 into the water receiving tank 1.
Supply as appropriate.

Inside the water passage 13 are a water stop valve 43 and an opening/closing valve 1.
5, communication with the water source is cut off, and therefore, the lid body 18 is removed from the valve body 12 in this state. This opens the upper surface of the pilot chamber 17, so the valve unit 2o inside the valve body 12 is removed through the pilot chamber 17, and the backing 24, valve body 23, etc. are replaced. After the maintenance and inspection of the valve unit 20 is completed, the switching valve 44 is operated to open the water cutoff valve port 43 of the water passageway 13 and close the first valve port 41 of the bypass path 40. Then, water from the water source flows into water passage 1.
3, the pressure valve 47 lowers due to the decrease in water pressure in the bypass passage 40, and this operation causes the water passage 13 to flow down.
The opening/closing valve 15 of the bypass passage 40 is opened, and the second valve opening 43 of the bypass passage 40 is closed.
Water flows sequentially within 3.

〔Effect of the invention〕

As explained above, according to the present invention, the flow path of water from the water source can be easily switched between the flow channel and the bypass channel by simply operating the switching valve, without requiring the operation of the conventional gate valve. Therefore, work such as maintenance and inspection of the valve unit can be performed easily and efficiently. In addition, the conventional switching valve is not required, and the structure is simple because the bypass passage is integrally formed in the valve body. It has the advantage of being inexpensive.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a sectional view of the constant water level valve when the water passage is open, and Figure 2 is a sectional view of the constant water level valve when the water passage is closed. , Figure 3 is a configuration diagram of a water tank water supply piping system, Figure 4 is a configuration diagram of a conventional water tank water supply piping system, and Figure 5 is a cross-sectional view of a constant water level valve used in the water tank water supply piping system. be. 1... Water tank, 2... Main water supply piping, 3... Constant water level valve, 4... Pilot piping, 10... Inlet, 11
... Outlet, 12... Valve body, 13... Water passage,
15... Valve port for opening and closing, 17... Pilot room, 2
0... Valve unit, 28... Pilot flow path, 40
... Bypass path, 41... First valve port, 42...
2nd valve port, 43... Valve port for water stop, 44... Switching valve, 47... Pressure valve. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] The valve body has an inlet at one end and an outlet at the other end, and a valve opening for opening and closing is formed in the middle of the passageway between the inlet and the outlet, and water flowing into the pilot pipe is provided. A valve unit is operated by the pressure fluctuation in the pilot chamber due to the control of the flow of water, the valve opening for opening and closing is opened and closed by the operation of the valve unit, and the supply of water to the water receiving tank is controlled by this opening and closing. A bypass passage parallel to the water passageway is integrally formed in the valve body, and a water cutoff valve port communicating with the inflow mouth is provided at the end of the water passageway on the inlet side, and a bypass passage on the inflow mouth side is provided. First valve ports communicating with the inflow port are formed at each end of the path, and a manual switching valve is provided for selectively opening and closing the valve ports,
A second valve port communicating with the outflow port is formed at an end of the bypass path on the outflow port side, and the first valve port is connected to the opening/closing valve port and the second valve port. A constant water level valve for a water receiving tank water supply piping system, characterized in that a pressure valve is provided which opens the second valve port by water pressure in a bypass passage when the valve is opened and closes the opening/closing valve port.