JPH0633827B2 - 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, a piping system for supplying water to a water receiving tank has a structure as shown in FIG.

In FIG. 4, 1 is a water receiving tank, 2 is a main water supply pipe for supplying water to the water receiving tank 1, and in the middle of this main water supply pipe 2, a constant water level valve 3 that is opened and closed by pilot water pressure is provided. 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 3 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, and the pilot valve control is performed when the water level in the water receiving tank 1 reaches the water supply stop water level L _2. It is adapted to be closed by the device 6. 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.

Explaining the structure of the constant water level valve 3, 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, as shown in FIG. The water passage 13 is between the inflow port 10 and the outflow port 11.
A partition wall 14 is provided in the middle of the water passage 13, and a valve port 15 is formed in the partition wall 14. Valve body 12
A pilot chamber 17 is formed at the upper part of the pilot chamber 17, and the pilot chamber 17 is detachably attached to the upper end of the valve body 12 and is sealed by a lid 18, and a cylinder 19 is housed in the pilot chamber 17. A valve unit 20 is provided so that the pilot chamber 17 extends inside the water passage 13. This valve unit 20 includes the cylinder 19
A piston 21 housed therein so as to be vertically movable, a rod 22 attached to the piston 21 and slidably penetrating the bottom wall of the cylinder 19 and projecting into the water passage 13, and a lower end portion of the rod 22. And a valve body 23 attached so as to face the valve opening 15, and a packing 24 is attached to the peripheral surface of the piston 18. 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 having a diameter larger than the outer diameter of the valve body 23 is formed in the pilot chamber 17 and the bottom surface.

The first pressure chamber 25 communicates with the water passage 13 on the inlet 10 side via 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 It communicates with the water passage 13 on the inflow port 10 side through a notch groove 29 formed on the side surface of the rod 22. The lid 18 is provided with a pipe connecting portion 30, the pilot pipe 4 is detachably connected to the pipe connecting portion 30, and the pilot pipe 4 is in communication with the first pressure chamber 25.

The constant water level valve 3 configured in this manner responds to the opening / closing operation of the pilot valve 5 in the water receiving tank 1 in accordance with the water level.
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,
A part 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 and the other part flow into the second pressure chamber 26 through the notches 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 and the valve body 2
3 is separated from the valve port 15 and the valve port 15 is opened, so that the water receiving tank 1 is sequentially passed from the water passage 13 through the main water supply pipe 2.
Water is supplied inside.

Then, when the water level in 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. Thereby, the valve unit 20 descends, the valve body 23 closes the valve port 15, and the water supply into the water receiving tank 1 is stopped. Further, when the water level in the water receiving tank 1 is lowered again to the water supply start water level L ₁ and the pilot valve 5 is opened, the pilot water flows, 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 repeating such a process.

A ball tap 31 is provided at the tip of the pilot pipe 4.
Is provided, and if the opening / closing control is not properly performed due to a power failure or failure of the pilot valve 5, this ball tap 3
1 controls the flow of pilot water.

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

In 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 is closed. Therefore, the constant water level valve 3 is sequentially passed through the water receiving tank 1. Water is supplied.

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, close the water shutoff valve 35 of the main water supply pipe 2 and then Then, the sluice valve 32a,
32b is closed, and in this state, connect the pilot pipe 4 to the lid 1.
8 is removed from the pipe connection portion 30, and the lid 18 is removed from the valve body 12. As a result, the upper surface of the pilot chamber 17 is opened. Therefore, the valve unit 20 in the valve body 12 is pulled out through the pilot chamber 17 and the packing 24
And the valve body 23 are replaced. Then, during such work, the water shutoff valve 34 of the bypass pipe 33 is opened, and in this state, the water shutoff valve 35 of the main water supply pipe 2 is manually opened and closed to receive the water from the bypass pipe 33 through the main water supply pipe 2. Water is appropriately supplied into the water tank 1.

[Problems to be Solved by the Invention]

However, in such a conventional configuration, the sluice valves 32a and 32b are provided on both sides of the constant water level valve, and the bypass pipe 33 is connected so as to straddle the sluice valves 32a and 32b and the constant water level valve 3 and further bypassed. Since the water stop valve 34 must be provided in the middle of the pipe 33, the structure is complicated and expensive, and the valve body 1 of the constant water level valve 3 is required.
When removing the valve unit 20 from the inside of 2, it is necessary to close each of the sluice valves 32a and 32b and further to open the water shutoff valve 34 of the bypass pipe 33. Therefore, the work is troublesome and time-consuming. There is a drawback that the efficiency decreases.

The present invention has been made by paying attention to such a point, and an object thereof is a water receiving tank having a simple structure and capable of easily and efficiently performing work such as withdrawing a valve unit from the inside of a valve body. It is to provide a constant water level valve for the water supply piping system.

[Means for Solving the Problems]

In order to achieve such an object, the present invention has an inflow port on one end side and an outflow port on the other end side, and an opening / closing valve port is provided in the middle of the water passage between these inflow port and outflow port. With the valve body formed, the valve unit is operated by pressure fluctuations in the pilot chamber due to the control of the flow of water flowing in the pilot pipe, and the valve unit for opening and closing is opened and closed by the operation of this valve unit. In controlling water supply to a water tank, a bypass passage parallel to the water passage is integrally formed in the valve body, and a stop communicating with the inlet is provided at an end of the water passage on the inlet side. A manual valve for forming a water valve opening at the end of the bypass on the inlet side and forming a first valve opening communicating with the inlet, and selectively opening and closing the valve opening for these valve openings Equipped with a switching valve of the type A second valve port communicating with the outflow port is formed at an end of the channel, and the second valve port for opening and closing and the second valve port are provided in the bypass channel when the first valve port is opened. A pressure valve that opens the second valve opening by water pressure and closes the opening / closing valve opening is provided.

[Work]

In normal times, the first valve opening of the bypass passage is closed by the switching valve, the water from the water source flows through the water stop valve opening into the water passage, and the flow of this water is opened and closed by the operation of the valve unit. It is controlled by opening and closing the valve opening.

Here, at the time of maintenance and inspection of the valve unit, the switching valve is operated to open the first valve opening of the bypass passage, and the valve opening for water stop of the water passage is closed by this switching valve. In response to such an operation, the water from the water source flows into the bypass passage through the first valve opening, and the pressure valve operates by the pressure of this water to open the second valve opening of the bypass passage. , The valve opening for opening and closing the water passage is closed. Then, by opening the second valve opening, the inside of the bypass passage communicates with the inside of the main water supply pipe through the second valve opening. Therefore, in this state, the water shutoff valve of the main water supply pipe is opened and closed, and the water source is passed through the bypass passage. The appropriate water is supplied to the receiving tank.

In the water passage, communication with the water source is blocked by closing the water stop valve opening and the valve opening / closing valve.Therefore, it is possible to remove the valve unit by removing the lid from the valve body in this state. Become. After the maintenance and inspection of the valve unit is completed, the switching valve is operated to open the water stop valve port of the water passage and close the first valve port of the bypass passage. As the water flows into the bypass passage, the pressure valve operates due to the decrease in the water pressure in the bypass passage, and this operation opens the valve opening for opening and closing the water passage and also closes the second valve opening of the bypass passage. As a result, water flows through the water passage.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. The parts corresponding to 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 bypass passage 40 is integrally formed in the valve body 12 in parallel with the water passage 13. The bypass passage 40 has a first valve opening 41 at one end on the inflow port 10 side and a second valve opening 42 at the other end on the outflow port 11 side. Through the first valve opening 41 to the inflow opening 10 and the second valve opening 4
2 and the outlets 11 communicate with each other. The water passage 13 has a valve opening 15 for opening and closing by a valve unit 20.
Separately from the above, a water-stop valve port 43 is formed on the inflow port 10 side, and the water passage 13 is formed through this valve port 43.
0, and the valve opening 43 is arranged so as to face the first valve opening 41 in the bypass 40 at a distance. Then, these valve openings 4 are provided between these valve openings 41 and 43.
A switching valve 44 for selectively opening and closing 1, 43 is provided. The switching valve 44 is attached to a valve shaft 45 that is screwed into the wall surface of the valve body 12, and is vertically displaced by rotating the valve shaft 45 via a handle 46, and this displacement causes a bypass passage. A state in which the first valve port 41 of 40 abuts against the first valve port 41 and seals the first valve port 41;
It is adapted to come into contact with the water shutoff valve opening 43 and to be closed.

The second valve opening 42 of the bypass 40 is arranged so as to face the water passage 13 and the opening / closing valve opening 15 apart from each other.
A pressure valve 47 is provided between the valve ports 42 and 15 so as to be vertically movable. The pressure valve 47 normally abuts and seals the second valve port 42 of the bypass 40, and when a constant water pressure is applied to the bypass 40, the pressure valve 47 rises by the pressure to increase the pressure. The valve port 42 is opened, and the valve port 15 for opening and closing the water passage 13 is brought into contact with and sealed.

As shown in FIG. 3, the constant water level valve 3 thus configured has the main water supply pipe 2 directly connected to the inflow port 10 and the outflow port 11. In a normal state, as shown in FIG. 1, the first valve port 41 of the bypass 40 is closed by the switching valve 44, and the water from the water source is stopped by the valve port 43.
It is maintained in a state of flowing through the water passage 13.

Under such a condition, part of the water flowing through the water passage 13 due to the opening of the pilot valve 5 is used as pilot water from the pilot flow passage 28 through the pilot chamber 1 in the same manner as described above.
7 into the first pressure chamber 25, and this pilot water further circulates in the pilot pipe 4 in sequence, 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 stopped. The pressure in the chamber 25 rises, and the variation of the pressure in the pilot chamber 17 causes the valve port 15 to be opened / closed via the valve unit 20, whereby the water supply to the water receiving tank 1 is controlled.

Here, when the packing 24 of the valve unit 20, the valve element 23, etc. are deteriorated and are replaced, the switching valve 44 is operated to operate the first valve opening 41 of the bypass passage 40.
Is opened and 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 flows from the water source into the bypass 40 through the first valve port 41, and the pressure valve 47 is raised by the pressure of the water to the valve port 15 for opening and closing the water channel 13. As a result, the second valve opening 42 of the bypass 40 is opened, and the valve opening 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 becomes the second
Since the outlet 11 communicates with the main water supply pipe 2 through the valve port 42, the water stop valve 35 of the main water supply pipe 2 is opened and closed in this state, and the water of the water source is received through the bypass passage 40.
Supply as appropriate.

The water passage 13 has a valve opening 43 for stopping water and a valve opening 1 for opening and closing.
Since the communication with the water source is blocked by closing the valve 5, the lid 18 is removed from the valve body 12 in this state. As a result, the upper surface of the pilot chamber 17 is opened, so that the valve unit 20 in the valve body 12 is pulled out through the pilot chamber 17 and the packing 24, the valve body 23, etc. are replaced. After such maintenance and inspection of the valve unit 20 is completed, the switching valve 44 is operated to open the water shutoff valve opening 43 of the water passage 13 and close the first valve opening 41 of the bypass passage 40. Then, the water from the water source passes through the water channel 1.
3, the pressure valve 47 descends due to the decrease in the water pressure in the bypass passage 40, and this operation causes the water passage 13 to flow.
The valve port 15 for opening and closing is opened and the second valve port 43 of the bypass 40 is closed, whereby the water passage 1
Water flows through 3 in sequence.

〔The invention's effect〕

As described above, according to the present invention, by simply operating the switching valve, it is possible to easily switch the flow path of the water from the water source to the water passage and the bypass passage without requiring the operation of the sluice valve as in the related art. Therefore, work such as maintenance and inspection of the valve unit can be performed easily and efficiently, the conventional switching valve is not required, and the bypass passage is formed integrally with the valve body, so the structure is simple. It has the advantage of being inexpensive.

[Brief description of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a sectional view of a constant water level valve in an open state of a water passage, and FIG. 2 is a sectional view of a constant water level valve in a closed state of a water passage. , Fig. 3 is a block diagram of a water receiving tank water supply piping system, Fig. 4 is a configuration diagram of a conventional water receiving tank water supply piping system, and Fig. 5 is a sectional view of a constant water level valve used in the water receiving tank water supply piping system. is there. 1 ... Water tank, 2 ... Main water supply pipe, 3 ... Constant water level valve, 4 ... Pilot pipe, 10 ... Inlet port, 11 ... Outlet port, 12 ... Valve body, 13 ... Water passage, 15 ... Open / close valve port, 17 ... Pilot chamber, 20 ... Valve unit, 28 ... Pilot channel, 40 ... Bypass channel, 41 ... First valve port, 42 ... Second valve Mouth, 43 ... Valve for shutting off water, 44 ... Switching valve, 47 ... Pressure valve.

Claims (1)

[Claims] 1. An inflow port at one end and an outflow port at the other end,
A valve main body with a valve opening for opening and closing formed in the middle of the water passage between these inlets and outlets, and the valve unit is operated by pressure fluctuations in the pilot chamber due to control of the flow of water flowing through the pilot piping. In the one that opens and closes the opening and closing valve port by the operation of this valve unit and controls the supply of water to the water receiving tank by this opening and closing, a bypass passage parallel to the water passage is integrally formed in the valve body. A first valve opening that is formed and that has a water stop valve port that communicates with the inflow port at the end of the water passage on the inflow port side, and that communicates with the inflow port at the end of the bypass channel on the inflow port side. And a manual switching valve for selectively opening and closing these valve openings, and a second valve communicating with the outlet at the end of the bypass passage on the outlet side. And a valve opening for opening and closing the A pressure valve that opens the second valve port and closes the opening / closing valve port by water pressure in the bypass when the first valve port is opened. A constant water level valve for the water supply system of the receiving tank.