JPH0577910B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pilot 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. 9, 1 is a water tank, 2 is a main water supply pipe that supplies water to the water tank 1, and a well-known constant water level valve 3 that is opened and closed by pilot water pressure is installed in the middle of this main water supply pipe 2. It is being 4 is 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, a pilot pipe 3 is opened and closed electromagnetically according to the water level in the water receiving tank 1. A pilot valve 5, which is a solenoid valve, is provided to control the flow of pilot water. A normal solenoid valve is used as this pilot valve 5.
is opened by the pilot valve control device 6 when the water level in the water receiving tank 1 falls to the water supply start water level _L1 , and is opened by the pilot valve control device 6 when the water level in the water receiving tank 1 reaches the water supply stop water level _L2 . It's starting to get shut down. 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. Although the structure of the constant water level valve 3 is not shown in the drawings, the constant water level valve 3 has a valve chamber formed between an inlet and an outlet to which the main water supply pipe 2 is connected, and a valve chamber that is branched from the inlet side of this valve chamber. A small-diameter pilot channel that sends out a portion of the water flowing through the valve chamber as pilot water, a cylinder section that communicates with this pilot channel, a piston rod that is moved by the water pressure of the pilot water in this cylinder section, and a piston rod that Therefore, it consists of a valve body that abuts against the valve seat in the valve chamber, and the pilot flow path is connected to a pilot piping connection section to which the pilot piping 4 is connected.

This water tank water supply piping system opens and closes a pilot valve 5 according to the water level in the water tank 1 to open and close a constant water level valve 3 to supply water to the water tank 1 and stop it. Water supply stops at water level L ₂
When the pilot valve 5 closes and the pressure of the pilot water in the pilot piping 4 and cylinder section between the pilot valve 5 and the constant water level valve 3 rises, the piston rod is moved by this pilot water pressure and the valve body is moved. contacts the valve seat in the valve chamber, and the constant water level valve 3 is closed. Furthermore, when the water level in the water receiving tank 1 drops to the water supply start water level _L1 and the pilot valve 5 opens, the pilot water pressure in the pilot piping 4 and the cylinder section decreases, and the valve body returns to its original position due to the water pressure in the valve chamber to maintain a constant water level. Valve 3 opens.

By the way, in the above water tank water supply piping system,
Power outage and pilot valve 5 drive part (solenoid part)
In case the opening/closing control of the pilot valve 5 becomes impossible due to a failure of the pilot valve 5a, a ball tap 8 is provided at the tip of the pilot pipe 4, and a bypass pipe 9 is provided in the pilot pipe 4 to bypass the pilot valve 5. When the pilot valve 5 cannot be controlled to open and close, the constant water level valve 3 is opened and closed by the ball tap 8. In addition,
_L3 is the closing water level of the ball tap 8, and the ball tap 8 is the water supply stop water level that is controlled by opening and closing the pilot valve 5 so that it does not close in the normal operating state where the pilot valve 5 can be opened and closed electromagnetically.
It is located higher than L ₂ . Further, the pilot pipe 4 is provided with gate valves 10a and 10b on both sides of the pilot valve 5, which are manually opened and closed, respectively. 10b
This bypass piping 9 is provided with a stop valve 11 that is manually opened and closed. While the pilot valve 5 is operating normally, the gate valves 10a and 10b are open and the water stop valve 11 is closed.
The pilot water flowing through the pilot pipe 4 does not pass through the bypass pipe 9 but flows through the pilot valve 5. In addition, when opening and closing the constant water level valve 3 using the ball tap 8, the gate valves 10a and 10b
, and open the water stop valve 11. In this way, the pilot water flows through the bypass pipe 9 without passing through the pilot valve 5, so the pilot water pressure can be changed by opening and closing the ball tap 8. The constant water level valve 3 can be opened and closed, and even if the pilot valve 5 is removed from the pilot piping 4 to repair or replace the pilot valve 5, pilot water will not leak from this location.

[Problem to be solved by the invention]

However, in the water receiving tank water supply piping system, the pilot piping 4 is provided with a bypass piping 9 that bypasses the pilot valve 5, gate valves 10a and 10b are provided on both sides of the pilot valve 5, and a water stop valve 11 is provided on the bypass piping 9. The structure of this part is complicated and the construction is troublesome, and
When switching the pilot water flow path when the pilot valve 5 cannot be opened/closed due to a power outage or a failure of the drive unit 5a of the pilot valve 5, etc., the gate valves 10a, 10b and the water stop valve 11 of the bypass piping 9 are used.
Since the pilot water flow path had to be opened and closed, switching the pilot water flow path was also troublesome.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a pilot valve installed in a water receiving tank water supply piping system.
In addition to the pilot valve function, we also provide a function to bypass the pilot water when the pilot valve cannot be electromagnetically opened/closed due to a power outage or failure of the drive unit, etc. To simplify the structure of a water receiving tank water supply piping system by eliminating a stop valve and a water stop valve, to facilitate its construction, and to easily perform pilot water flow path switching operations.

[Means to solve the problem]

The pilot valve of the present invention includes: an inlet connected to a pilot piping connection part of the constant water level valve; an outlet connected to the pilot piping; and a main flow path communicating the inlet and the outlet.
A valve body having a solenoid valve chamber formed in a part of the main flow passage and having one end open to the outside, a valve body inserted into the solenoid valve chamber to open and close the main flow passage, and a valve body for driving the valve body. a solenoid, and a solenoid valve driving unit removably attached to the valve body so as to close an open end of the solenoid valve chamber, and a solenoid valve drive unit that is removably attached to the valve body to close the open end of the solenoid valve chamber; a flow path switching valve chamber that passes through a part of the inflow side main flow path between the outlet port and the outflow side main flow path between the outlet port and the electromagnetic valve chamber; The section is bypassed and opened into the flow path switching valve chamber at one end, and communicates with one of the inflow side main flow path and the outflow side main flow path via this flow path changeover valve chamber, and the other end is connected to the other main flow path. a bypass flow path communicating with the flow path, and a flow path switching valve that is manually operated from outside the valve body is provided in the flow path switching valve chamber;
The flow path switching valve includes a partition portion that partitions between the inflow side main flow path and the outflow side main flow path, a main flow path opening/closing valve portion that opens and closes the aforementioned inflow side main flow path and the outflow side main flow path, and this main flow path. a bypass passage opening/closing valve part that closes the bypass passage when the opening/closing valve part opens the main passage, and opens the bypass passage when the main passage opening/closing valve part closes the main passage; It is characterized by the fact that it has been provided.

[Effect]

That is, the pilot valve of the present invention includes a valve body in which a solenoid valve chamber is formed in a part of a main flow passage that communicates an inlet and an outlet, and a solenoid valve drive unit that is detachably attached to the valve body. The solenoid valve functions in the same manner as a conventional pilot valve, and includes a flow path switching valve chamber in the valve body that passes through a part of the main flow passage on the inflow side and a part of the main flow passage on the outflow side; A bypass passage is provided which bypasses the main passage penetrating portion of the passage switching valve chamber and opens into the passage switching valve chamber at one end to communicate the inflow side main passage and the outflow side main passage, and A flow switching valve is installed in the pilot valve chamber to bypass the pilot water when the pilot valve cannot be electromagnetically controlled to open or close due to a power outage or failure of the drive unit (electromagnetic valve drive unit). The flow path switching valve has a partition part that partitions the inflow side main flow path and the outflow side main flow path, and a main flow path opening/closing function that opens and closes the inflow side main flow path and the outflow side main flow path. and a bypass that closes the bypass passage when the main passage opening/closing valve unit opens the main passage, and opens the bypass passage when the main passage opening/closing valve unit closes the main passage. This flow path switching valve allows the flow path of the pilot water flowing inside the pilot valve to be routed from the inflow side main flow path through the solenoid valve chamber to the outflow side main flow path. The flow path can be switched to a flow path in which the main flow path flows from the inflow side main path to the outflow side main flow path through the bypass flow path.

This pilot valve not only has the pilot valve function, but also has the function of bypassing the pilot water when the pilot valve cannot be opened or closed due to a power outage or failure of the drive unit.
If this pilot valve is used in the water tank water supply piping system, bypass piping, gate valves, and stop valves can be eliminated from the pilot piping, simplifying the structure of the water tank water supply piping system and making its construction easier. Furthermore, the pilot water flow path switching operation can be easily performed by simply operating the flow path switching valve of the pilot valve.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

First, the configuration of the water tank water supply piping system using the pilot valve of this embodiment will be explained. FIG. 5 shows the water tank water supply piping system described above.
0 is provided between a constant water level valve 3 provided on the main water supply pipe 1 and a pilot pipe 4 branched from this constant water level valve. Note that the constant water level valve 3 is
Since it is the same as that used in the conventional water tank water supply piping system, its explanation will be omitted. Further, in FIG. 5, the same parts as shown in FIG. 9 are given the same reference numerals, and the explanation thereof will be omitted.

6 to 8 are enlarged views of the constant water level valve 3 and the pilot valve 20 of the water receiving tank water supply piping system. The pilot valve 20 connects its inlet 22 to the pilot valve 3 of the constant water level valve It is connected to the piping connection via a short tube-shaped nipple 3a and supported by the constant water level valve 3, and the pilot piping 4 is connected to the pilot valve 2.
It is connected to the outlet 23 of No. 0.

Next, to explain the structure of the pilot valve 20, FIGS. 1 and 2 are longitudinal sectional side views of the pilot valve 20, and FIG. 1 shows a structure in which the pilot water flow path is the original flow path of the pilot valve. Fig. 2 shows a state in which the pilot water flow path is bypassed and the solenoid valve drive unit is removed. 3 is a sectional view taken along the - line in FIG. 1, and FIG. 4 is a sectional view taken along the - line in FIG. 2.

1 to 4, 21 is a valve body made of a square metal block, and an inlet 22 connected to the pilot piping connection part of the constant water level valve 3 is bored in the lower surface of the valve body 21, and the pilot An outlet 23 connected to the pipe 4 is bored in one side of the valve body 21. Further, inside the valve body 21, a main channel 24a that communicates the inflow port 22 and the outflow port 23,
4b is bored, and a solenoid valve chamber 25 is provided in a part thereof. The electromagnetic valve chamber 25 is recessed in the upper surface of the valve body 21, and its upper end is open to the outside of the valve body 21. Further, among the hand flow passages 24a and 24b, the flow passage 24a between the inflow port 22 and the solenoid valve chamber 25 is an inflow side main flow path, and the flow path 24a between the outflow port 23 and the solenoid valve chamber 25 is
b is an outflow side main flow path, and the inflow side main flow path 24a and the outflow side main flow path 24b each open at the bottom of the electromagnetic valve chamber 25, and are further opened at the opening of the electromagnetic valve chamber of the outflow side main flow path 24b. A valve seat 26 is formed.

A solenoid valve drive unit 27 is detachably attached to the valve body 21 by blocking the open end of the solenoid valve chamber 25, and this solenoid valve drive unit 26 includes:
The main flow path 14a is inserted into the electromagnetic valve chamber 25,
A valve body 28 that opens and closes 24b, a solenoid 29 that drives this valve body 28, and a valve body return spring 30 are provided. The valve body 28 includes a plunger 28a that is moved toward the electromagnetic valve chamber 25 by the excitation of the solenoid 29, and a seal that is provided on the tip surface of the plunger 28a and that touches and separates from the valve seat 26 in the electromagnetic valve chamber 25. It consists of a material 28b. Further, 31 is a valve body mounting member attached to the electromagnetic valve drive unit 26, and the valve body return spring 30 is
It is provided between a flange protruding from the outer periphery of the tip of the plunger 28a and the valve body mounting member 31. Then, the solenoid valve drive unit 26 is mounted on the solenoid valve chamber 25 by screwing the valve body mounting member 31 attached thereto to the open end of the solenoid valve chamber of the valve body 21.
It is removably attached to the valve body 21 by closing the open end of the valve.

The valve body 21 also includes a main flow passage 24 on the inflow side.
A flow path switching valve chamber 32 is provided that penetrates a part of the main flow path 24b and a part of the main flow path 24b on the outflow side. has been done. In addition, this flow path switching valve chamber 3
The rear end side of 2 is a large-diameter valve chamber 32a, and the front end side is a small-diameter valve chamber 32b.The rear end of the large-diameter valve chamber 32a is open to the other side surface of the valve body 21. The upstream side (inlet communication side) of the inflow side main channel 24a opens to the side surface of the large diameter valve chamber 32a of the flow path switching valve chamber 32, and the downstream side (the electromagnetic valve chamber communication side) opens to the side surface of the small diameter valve chamber 32b. It is open on the side and the large diameter valve chamber 32
The distal end surface of a (the end surface on the small diameter valve chamber 32a side) is a valve seat 33a that is opened and closed by the flow path switching valve 36. Further, the upstream side (the electromagnetic valve chamber communication side) of the outflow side main flow path 24b is connected to the small diameter valve chamber 3 of the flow path switching valve chamber 32.
2b, and the downstream side (outflow port communication side) opens at the tip surface of the small diameter valve chamber 32b, and the tip surface of the small diameter valve chamber 32b is opened and closed by the flow path switching valve 36. It is considered as a valve seat 33b.

Further, the valve body 21 includes the flow path switching valve chamber 3.
Bypassing the main channel penetrating portion of No. 2, the inflow side main channel 24
A bypass flow path 34 is provided which communicates the main flow path 24b on the outflow side with the main flow path 24b on the outflow side. This bypass passage 34
is formed parallel to the flow path switching valve chamber 32,
Main flow communication passages 34a and 34 are provided at both ends thereof, respectively.
b is formed. The main flow communication passage 34a on one end side of the bypass flow passage 34 is connected to the flow passage switching valve chamber 3.
The second large-diameter valve chamber 32a is opened on the side surface thereof, and communicates with the upstream side of the inflow side main flow path 24a via the flow path switching valve chamber 32. In addition, this bypass flow path 3
The main flow communication passage 34b on the other end side of 4 communicates with the downstream side of the outflow side main flow path 24b, that is, the portion between the flow path switching valve chamber 32 and the outlet 23.

Further, the main flow communication passage 34a on one end side of the bypass flow passage 34 is connected to the large diameter valve chamber 3 of the flow passage switching valve chamber 32.
It opens into the large-diameter valve chamber 32a at the rear end side of the flow path switching valve chamber 32 than the opening position of the inflow side main flow path 24a with respect to 2a, and this bypass flow path opening (the opening of the main flow communication path 34a) ) and the opening of the inflow side main channel 24a is the large diameter valve chamber 32.
They are communicated via a sleeve member 35 inserted into the rear end side of a. This sleeve member 35 has flanges on the outer periphery of both ends that are in close contact with the inner circumferential surface of the large-diameter valve chamber 32a, and the outer circumferential surface between the flanges on both ends corresponds to the bypass passage opening. The annular flow path 35a is formed by recessing the annular flow path 35a.
a communicates with the internal space of the sleeve member 35 through a communication hole 35b provided in a part thereof. Further, the internal space of the sleeve member 35 is a flow path communicating with the inside of the large-diameter valve chamber 32a, and furthermore, the distal end surface of the sleeve member 35 is connected to the flow path switching valve 3.
The valve seat 35c is opened and closed by the valve 6.

The flow path switching valve 36 is manually operated from outside the valve body 21 to open and close the inflow side main flow path 24a, the outflow side main flow path 24b, and the bypass flow path 34. In the flow path switching valve chamber 32, from the large diameter valve chamber 32a to the small diameter valve chamber 3.
It is inserted so that it can move forward and backward across 2b.
The flow path switching valve 36 is made of one rod-shaped member, and the outer periphery of the tip side portion of the flow path switching valve chamber 32 has an inflow side main flow path opening and an outflow side main flow path of the small diameter valve chamber 32b. Small diameter valve chamber 3 between the opening and
An annular partition portion 37 is slidably formed in close contact with the inner circumferential surface of the flow path switching valve 2b to partition the main flow path 24a on the inflow side and the main flow path 24b on the outflow side. An outflow side main flow passage opening/closing valve portion 38b is formed in the valve portion 38b, which comes into contact with and separates from the valve seat 33b on the distal end surface of the small diameter valve chamber 32b. Further, an annular protrusion having a diameter slightly larger than the diameter of the small-diameter valve chamber 32b of the flow path switching valve chamber 32 and the inner diameter of the sleeve member 35 is formed in the intermediate portion of the flow path switching valve 36.
A flow path switching valve chamber 32 is provided on the distal end surface of this annular protrusion.
An inlet main flow channel opening/closing valve part 38a is formed on the rear end surface of the valve seat 33a on the front end face of the large diameter valve chamber 32a, and a valve seat 35a on the front end face of the sleeve member 35 is formed on the rear end face.
A bypass flow path opening/closing valve portion 38c is formed to open and close the bypass flow path. Note that the outer diameter of the annular protrusion at the intermediate portion of the flow path switching valve 36 is smaller than the diameter of the large diameter valve chamber 32a of the flow path switching valve chamber 32.
The outer diameter of the tip side portion (the outer diameter of the portion excluding the partition portion 37) is smaller than the diameter of the small diameter valve chamber 32b of the flow path switching valve chamber 32, and the outer peripheral surface of the flow path switching valve 36 and the flow path switching The space between the valve chamber 32 and the inner circumferential surface forms a flow path for pilot water.

The rear end side of the flow path switching valve 36 is screwed into a nut member 39 that is attached to the opening at the rear end of the flow path switching valve chamber 32 and receives the rear end of the sleeve member 35. This flow path switching valve 36 is
A knob 36 provided at the rear end projecting outside the valve body 21
By manually turning a, the flow path switching valve chamber 32
It is designed to move forward and backward within the space. In addition, the inflow side main channel opening/closing valve part 38 of this flow path switching valve 36
a and the valve seat 33a that it comes into contact with and separates from, and the distance between the outflow side main flow passage opening/closing valve part 38b and the valve seat 33b that it comes into contact with and separates from are the same, so that the inflow side main flow path The opening/closing valve part 38a and the outflow side main flow passage opening/closing valve part 38b are simultaneously connected to the valve seat 33.
a, 33b. Furthermore, the length of the annular protrusion at the middle part of the flow path switching valve 36 is
A valve seat 33a on the front end surface of the large diameter valve chamber 32a of the flow path switching valve chamber 32 and a valve seat 5c on the front end surface of the sleeve member 35.
The bypass passage opening/closing valve part 38c at the rear end of this annular protrusion is smaller than the interval between the main passage opening/closing valve parts 38a, 38 on the inflow side and the outflow side.
When b separates from the valve seats 33a, 33b to open the inflow side and outflow side main channels 24a, 24b, it comes into contact with the valve seat 35c of the sleeve member 35 and closes the bypass channel 34, thereby opening and closing the main channel. Valve part 38
When the valve seats 33a, 38b come into contact with the valve seats 33a, 33b and close the main flow passages 24a, 24b, they separate from the valve seat 35c and open the bypass flow passage 34.

In addition, 39 is the inlet 2 of the inflow side main channel 24a.
2 and the flow path switching valve chamber 32, and this stop valve 39 is provided to cut off the flow of pilot water when inspecting the water receiving tank water supply piping system, etc. . Further, in the figure, 40 is a blind plug that closes the cutting opening of the main flow channel 24a on the inflow side, and 41, 41a, and 41b are the bypass flow channel 34 and its main flow communication channels 34a, 34b.
It is a blind plug that closes the cutting opening of the

That is, the pilot valve has its inlet port 2.
Main channels 24a, 24 that communicate between 2 and the outlet 23
Valve body 21 with a solenoid valve chamber 25 formed in a part of b
and a solenoid valve drive unit 27 detachably attached to the valve body 21 constitute a solenoid valve that functions similarly to a conventional pilot valve. A flow path switching valve chamber 32 that passes through a portion of the flow path switching valve chamber 32 and a portion of the main flow path 24b on the outflow side; Inflow side main flow path 24a and outflow side main flow path 24b
A bypass flow path 34 is provided to communicate with the pilot valve 20, and a flow path switching valve 36 is provided in the flow path switching valve chamber 32, so that the pilot valve 20 can be protected against power failure or failure of the drive section (electromagnetic valve drive unit 27). It is provided with a function to bypass the pilot water when the pilot valve 20 cannot be opened/closed due to reasons such as the above.

In this pilot valve 20, the flow path switching valve 36 includes a partition portion 37 that partitions between the inflow side main flow path 24a and the outflow side main flow path 24b, and a partition portion 37 that opens and closes the inflow side main flow path 24a and the outflow side main flow path 25b. The main flow passage opening/closing valve parts 38a, 38b and the main flow passage opening/closing valve parts 38a, 38b are the main flow passages 24a, 24b.
When opening the main channels 24a, 2, the bypass channel 34 is closed and the main channel opening/closing valve parts 38a, 38b open the main channels 24a, 2.
Since a bypass flow passage opening/closing valve part 38c is provided, which opens the bypass flow passage 34 when the pilot valve 4b is closed, the flow passage switching valve 36 allows the flow passage of the pilot water flowing inside the pilot valve 20 to be closed. A flow path that flows from the side main flow path 24a through the electromagnetic valve chamber 25 to the outflow side main flow path 24b, and a flow path that flows from the inflow side main flow path 24a through the bypass flow path 34 to the outflow side main flow path 24b.
It is possible to switch between the flow path and the flow path.

That is, when the pilot valve 20 is driven by the solenoid valve drive unit 27 and operates normally, the flow path switching valve 36 is retracted as shown in FIGS. 1 and 3, and at this time, the inlet 22
As shown by arrows in the figure, the pilot water flows into the large-diameter valve chamber 32a of the flow path switching valve chamber 32 and the small-diameter valve chamber 32 on the upstream side of the inflow-side main flow channel 24a.
b, downstream side of the inflow side main channel 24a, solenoid valve chamber 2
5. It flows out from the outlet 23 into the pilot pipe 4 through the upstream side of the outflow side main flow path 24b, the small diameter valve chamber 32b of the flow path switching valve chamber 32, and the downstream side of the outlet side main flow path 24b. In addition, if the pilot valve 20 cannot be opened or closed due to a power outage or failure of the drive section (electromagnetic valve drive unit 27), move the flow path switching valve 36 forward as shown in FIGS. 2 and 4. , the main flow channels 24a, 24b may be closed and the bypass flow channel 34 may be opened. In this way, the pilot water flowing in from the inlet 22 will flow through the main flow channel on the inflow side, as shown by the arrow in the same figure. 24a flows from the upstream side of the flow path switching valve chamber 32 through the large diameter valve chamber 32a of the flow path switching valve chamber 32 to the bypass flow path 34, and flows to the downstream side of the outlet main flow path 24b without passing through the electromagnetic valve chamber 25. It flows out into the pilot piping 4. In addition,
At this time, the flow of pilot water is controlled by the ball tap 8 at the tip of the pilot pipe 4. In addition, if the drive part of the pilot valve 20, that is, the solenoid valve drive unit 27, breaks down,
With the flow path of the pilot water switched to the flow path passing through the bypass flow path 34, the electromagnetic valve drive unit 27 can be removed from the valve body 21 as shown in FIG. 2 to repair or replace it. If the water flow path is switched in this way, pilot water will not flow into the solenoid valve chamber 25, so even if the solenoid valve drive unit 27 is removed from the valve body 21, pilot water will not leak from this location. .

In this way, the pilot valve 20 has not only the pilot valve function but also the function of bypassing the pilot water when the pilot valve 20 cannot be opened/closed due to power outage, failure of the drive unit, or the like.

Therefore, if this pilot valve 20 is used in a water tank water supply piping system, bypass piping, gate valves, and stop valves can be eliminated from the pilot piping 4, and the water tank water supply piping system can be simplified as shown in FIG. In addition, the pilot water flow path switching operation can be performed using the flow path switching valve 36 of the pilot valve 20.
This can be easily done by simply operating the .

In addition, in the above embodiment, the main flow path 24a,
Of 24b, 24a is the inflow side and 24b is the outflow side, but conversely, 24a may be the outflow side main channel (22 is the outlet) and 24b is the inflow side main channel (23 is the inlet). . In addition, the above examples are as follows:
The inlet 22 of the pilot valve 20 is connected to the pilot piping connection of the constant water level valve 3 via a short tube-shaped nipple 3a; It may also be connected to the upstream side pilot piping.

〔Effect of the invention〕

The pilot valve of the present invention includes a valve body in which a part of the main flow passage communicating between an inlet and an outlet forms a solenoid valve chamber, and a solenoid valve drive unit detachably attached to the valve body. The solenoid valve functions in the same manner as a conventional pilot valve, and the valve body includes a flow path switching valve chamber that penetrates a part of the main flow passage on the inflow side and a part of the main flow passage on the outflow side, and a bypass passage bypassing a main passage penetrating portion of the passage switching valve chamber and opening into the passage switching valve chamber at one end to communicate the inflow side main passage and the outflow side main passage; A flow path switching valve is installed in the valve chamber to bypass the pilot water when the pilot valve cannot be electromagnetically controlled to open and close due to power outage, failure of the drive unit (solenoid valve drive unit), etc. This pilot valve not only has the pilot valve function, but also has the function of bypassing the pilot water when the pilot valve cannot be opened or closed due to power outage or drive unit failure, etc. If this pilot valve is used in the water tank water supply piping system, bypass piping, gate valves, and stop valves can be eliminated from the pilot piping, simplifying the structure of the water tank water supply piping system and making its construction easier. death,
Further, the pilot water flow path switching operation can be easily performed by simply operating the flow path switching valve of the pilot valve.

[Brief explanation of the drawing]

Figures 1 to 8 show an embodiment of the present invention. Figure 1 is a longitudinal cross-sectional side view of the pilot valve in a normal state, and Figure 2 is a side view of the pilot valve when the pilot water flow path is bypassed and the solenoid valve is driven. Vertical side view of the pilot valve with the unit removed, No. 3
The figure is a sectional view taken along the - line in Figure 1, Figure 4 is a sectional view taken along the - line in Figure 2, Figure 5 is a configuration diagram of the water tank water supply piping system, and Figure 6 is the water tank water supply piping system. The side view of the constant water level valve and the pilot valve, FIGS. 7 and 8 are also a front view and a plan view thereof.
FIG. 9 is a configuration diagram of a conventional water tank water supply piping system. 1...Water tank, 2...Main water supply piping, 3...Constant water level valve,
4...Pilot piping, 6...Pilot valve control device, 7...Water level detector, 8...Ball tap, 20...
Pilot valve, 21...Valve body, 22...Inflow port, 2
3...Outlet port, 24a...Inlet side main channel, 24b...Outlet side main channel, 25...Solenoid valve chamber, 27...Solenoid valve drive unit, 28...Valve body, 29...Solenoid, 32
...Flow path switching valve chamber, 34...Bypass flow path, 36...Flow path switching valve.

Claims (1)

[Scope of Claims] 1. A main water supply pipe that supplies water to a water tank, a constant water level valve that is opened and closed by pilot water pressure provided in this main water supply pipe, and a pipe that branches off from this constant water level valve and supplies water to the water tank. A pilot valve is provided in a water tank water supply piping system equipped with an introduced pilot pipe, and is electromagnetically opened and closed according to the water level in the water tank to control the flow of pilot water flowing through the pilot pipe. An inlet connected to a pilot piping connection portion of the constant water level valve, an outlet connected to the pilot piping, a main flow passage communicating the inflow and outflow ports, and a main flow passage formed in a part of the main flow passage. a valve body having a solenoid valve chamber whose one end is open to the outside; a valve body inserted into the solenoid valve chamber to open and close the main flow passage; and a solenoid that drives the valve body. a solenoid valve drive unit that is removably attached to the valve body to close an open end of the solenoid valve chamber; and a part of the main flow passage on the outflow side between the outlet and the electromagnetic valve chamber; a bypass flow path that opens into the switching valve chamber and communicates with one of the inflow side main flow path and the outflow side main flow path through the flow path switching valve chamber, and the other end communicates with the other main flow path; a flow path switching valve that is manually operated from outside the valve body is provided in the flow path switching valve chamber;
The flow path switching valve includes a partition portion that partitions between the inflow side main flow path and the outflow side main flow path, a main flow path opening/closing valve portion that opens and closes the aforementioned inflow side main flow path and the outflow side main flow path, and this main flow path. a bypass passage opening/closing valve part that closes the bypass passage when the opening/closing valve part opens the main passage, and opens the bypass passage when the main passage opening/closing valve part closes the main passage; A pilot valve for a water receiving tank water supply piping system.