JP4156326B2 - Pressure reducing valve for water supply - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a door-side water supply pressure reducing valve for adjusting a water supply pressure in a place where water supply is performed by pump pressurization such as in an apartment house.
[0002]
That is, in places where water is supplied by pump pressurization, such as in apartment buildings, if only pump pressurization is used, the water supply pressure decreases as you go to the upper floor due to gravity, and the water supply pressure increases as you lower the floor. Therefore, a door-to-door water supply pressure reducing valve has been used to protect faucets and adjust the amount of water supply.
[0003]
In addition, when the connection of the water supply pipe is completed up to the end faucet, a pressure-resistant inspection is performed to check for leaks, but the pipe just constructed contains a lot of foreign matter such as pipe chips and sand, so the entire pipe After the cleaning, the pressure resistance test is performed.
[0004]
The present invention relates to a pressure reducing valve for door-to-side water supply that can smoothly perform pressure resistance inspection after performing pipe cleaning and cleaning at the stage where the connection of such water supply pipes is completed up to the terminal faucet.
[0005]
[Prior art]
Conventionally, the pipe cleaning and pressure resistance inspection as described above has a structure in which the pressure reducing valve is configured to adjust the feed water pressure by opening and closing the valve body by receiving a diaphragm that houses the pressure on the secondary side. If the pressure is applied, the valve body closes and cannot be cleaned.After replacing the pressure reducing valve at the place where the pressure reducing valve is installed and cleaning the pipe, replace the replacement pipe with the pressure reducing valve, and perform a pressure resistance test. The way to do it has been taken.
[0006]
However, the replacement work of the substitute pipe and the pressure reducing valve is an extremely troublesome work and requires a lot of time and labor. Therefore, as shown in Patent Document 1, the pressure reducing mechanism unit is rotatable with respect to the valve box, and two pressures are used. A pressure detection hole is provided to connect the primary side pressure chamber and the secondary side pressure chamber by matching the detection hole at the rotational position, and the communication passage is opened and closed by rotation of the pressure reducing mechanism unit so as to avoid closing the valve element. (Claim 1 of Patent Document 1), or a pressure reducing mechanism unit set at the upper part of the valve box can be removably engaged. The pressure reducing mechanism unit is removed and the unit loading port and the pressure detection hole are sealed with a closing lid. (Claim 3 of Patent Document 1) and the like have been performed.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-124235
[Problems to be solved by the invention]
However, making the pressure-reducing mechanism unit rotatable or freely detachable increases the complexity of the pressure-reducing valve structure more than necessary, which has an impact on cost, and substitute pipes and pressure-reducing valves. Even if it is not as much as the replacement work, the work of aligning or shifting the two pressure detection holes at the rotational position, and the work of removing the pressure reducing mechanism unit are bothersome, and the pressure-contacting of the communication path is not possible. There remains anxiety that power does not work.
[0009]
[Means for Solving the Problems]
The present invention provides one side of the passage to the diaphragm pressurizing chamber provided in isolation from the communication passage between the primary pressure chamber and the secondary pressure chamber without significantly changing the structural specification of the conventional pressure reducing valve. In addition, a communication valve hole is set in the passage from the secondary side water passage to the diaphragm pressurizing chamber, a valve plug that has a sealed plug structure at the tip and is urged in the backward direction is set, and the valve is set by fitting a pushing jig. The communication valve hole can be opened and closed by the eaves, and the push-in jig fitting hole can be used as it is as a pressure gauge mounting part for the pressure resistance inspection of the pressure reducing valve itself.
[0010]
That is, by screwing the pushing jig into the pressure gauge mounting portion, the valve rod provided there moves forward against the urging in the backward direction, and the sealing plug structure at the valve rod tip is connected to the secondary side water passage. When the communication valve hole is closed by pressing against the communication valve hole, and the pushing jig is removed, the valve rod is retracted by urging and the communication valve hole is opened.
[0011]
If the communication valve hole is closed, even if pipe cleaning pressure is applied from the primary pressure chamber to the secondary pressure chamber, the passage to the diaphragm pressurization chamber is not pressurized, so that the valve body is closed. In addition, problems such as biting of foreign matter flowing in the valve body by the cleaning pressure do not occur. Further, since the valve body does not close even when the pressure increases during the pressure resistance test, it is possible to apply pressure to the primary side of the pressure reducing valve.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a valve box, which comprises a primary pressure chamber 13 communicating with the inlet 11 on both sides of the valve body 2 and a secondary pressure chamber 14 communicating with the discharge port 12, and the pressure reducing mechanism unit 3 is fitted on the upper part. Has been.
[0013]
The water flow is discharged from the discharge port 12 from the primary side through the strainer 16 of the primary side pressure chamber 13, the valve body 2, and the secondary side pressure chamber 14 by opening the stop cock 15. The side of the pressure chamber 14 is provided with a passage 17 to the diaphragm pressurizing chamber 21 provided so as to be separated from the communication passage between the primary side pressure chamber and the secondary side pressure chamber. The same water pressure is applied to the pressurizing chamber 21.
[0014]
A diaphragm 4 is stretched on the upper surface of the diaphragm pressurizing chamber 21, and the diaphragm 4 is urged downward together with the valve body 2 by a spring 31 and a diaphragm presser 32 stretched on the pressure reducing mechanism unit 3.
[0015]
When the water pressure in the secondary pressure chamber 14 is increased by closing the end faucet, the water pressure in the pressurizing chamber 21 is also increased through the passage 17, and the attached valve body 2 is pushed up against the spring 31. Therefore, the valve blade 22 is joined to the valve seat 23, and the pressure reducing valve is closed.
[0016]
Further, when the water pressure in the secondary pressure chamber 14 decreases due to the opening of the end faucet, the water pressure in the pressurizing chamber 21 also decreases, and the diaphragm 4 is lowered by the urging force of the spring 31, and the pressure reducing valve is opened. The water pressure is adjusted.
[0017]
Since the pressure reducing valve is configured in this way, when the water pressure is applied from the primary side to the secondary side for the above-described pipe cleaning or pressure resistance inspection, the water pressure in the secondary pressure chamber 14 and the pressure chamber 21 increases. The pressure reducing valve is closed. In the pressure reducing valve according to the present invention, the passage 17 to the pressurizing chamber 21 is provided so as to be isolated from the communication passage between the primary side pressure chamber and the secondary side pressure chamber, and one side thereof is connected to the secondary side water passage. A communication valve hole 51 is provided, and a valve rod 5 that opens and closes the valve hole 51 is set.
[0018]
The valve rod 5 is urged in a backward direction by a spring 52, and an O-ring 53 is attached to the tip so that the communication valve hole 51 is tightly plugged when moving forward. When trying to apply water pressure from the primary side to the secondary side while avoiding the closing operation of the pressure reducing valve, if the pushing jig 6 is screwed into the fitting hole 54 and the valve rod 5 is advanced, the O-ring 53 completely closes the communication valve hole 51 tightly.
[0019]
An O-ring 55 is attached to the rear end of the valve rod 5 to prevent water leakage when the valve rod 5 is retracted. In addition, the fitting hole 54 can be used when performing pressure resistance inspection of the pressure reducing valve by attaching a pressure gauge as described above.
[0020]
Since the present invention is configured as described above, it is possible to perform pipe cleaning and pressure resistance inspection by simply screwing the pushing jig 6 into the fitting hole 54 without using a substitute pipe. 51 was also able to be assured by positive pressure closing by pushing the pushing jig 6 into place.
[0021]
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, and is a longitudinal side view of a pressure reducing valve for door-to-side water supply. FIG. Front view [Fig. 3] Similarly, a longitudinal front view of the pressure reducing valve for door-to-side water supply with the valve rod advanced and the communication valve hole closed [Explanation of symbols]
1 Valve box
11 Water supply inlet
12 Water supply outlet
13 Primary pressure chamber
14 Secondary pressure chamber
15 Stopcock
16 Strainer
17 Passage 2 to diaphragm pressurizing chamber Pressure reducing valve body
21 Diaphragm pressurization chamber
22 Valve blade of pressure reducing valve
23 Valve seat 3 of pressure reducing valve body Pressure reducing mechanism unit
31 Diaphragm bias spring
32 Diaphragm retainer 4 Diaphragm 5 Communication valve hole open / close valve
51 Communication valve hole to the secondary water passage
52 Valve bias spring
53 Valve O-ring
54 Push-in jig fitting hole
55 Valve rod tail O-ring 6 Pushing jig

Claims (2)

Advancement of the valve rod which is provided with a sealing plug at the tip and is urged in the backward direction on one side of the passage to the diaphragm pressurization chamber provided separately from the communication passage between the primary pressure chamber and the secondary pressure chamber By opening and closing the communication valve hole by opening and closing the valve rod by moving the valve rod forward and backward by screwing the push-in jig into and out of the push-in jig fitting hole. A pressure-reducing valve for door-to-door water supply, wherein the pressure path and the diaphragm non-pressure path are switched.   The pressure reducing valve for door-to-door water supply according to claim 1, wherein the push-in jig fitting hole is a pressure gauge mounting portion for pressure resistance inspection of the pressure reducing valve itself.

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