JP2002031256A - By-pass valve built-in type pressure reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs for a pressure proof and leakage test when installing a house-to-house pressure reducing valve installed from house to house. SOLUTION: A pressure reducing valve part (a pressure reducing mechanism) 10C of this house-to-house pressure reducing valve, and a by-pass valve 20 that can open/close a by-pass passage by-passing the pressure reducing valve part, are integrally built in a valve casing 10. When making a pressure proof and leakage test, the by-pass valve 20 is opened to directly apply proof pressure applied to the primary chamber 10A side of the pressure reducing valve, to the secondary chamber 10B side. The pressure proof and leakage test can thereby be made without installing special piping. Time and cost for the pressure proof and leakage test can thereby be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve for an individual house provided to each house to supply water at a constant pressure to each household, and more particularly to a built-in bypass valve having a built-in bypass valve for bypassing the pressure reducing valve. It relates to a pressure reducing valve.

[0002]

2. Description of the Related Art In general, house-to-house or apartment houses have a constant water supply pressure, reduce water hammer, and protect equipment, appliances, pipes (PVC pipes) and the like in each house. A pressure reducing valve is provided. By the way, when the pressure reducing valve is installed, it is necessary to perform a pressure resistance and leak test of devices, instruments and piping such as a toilet, a lavatory, a water heater, a faucet and the like connected to the pressure reducing valve and its secondary side. .
Conventionally, in this pressure resistance and leak test, after connecting a bypass pipe that bypasses the pressure reducing mechanism to the pressure reducing valve and setting the primary side and the secondary side of the pressure reducing valve to have the same pressure,
High pressure pressure is applied to the primary side of the pressure reducing valve, and the high pressure pressure is bypassed to the pressure reducing mechanism of the pressure reducing valve and directly reaches the secondary side.

[0003]

The bypass pipe described above is
It is provided only for the pressure resistance and leak test, but it costs much to connect the bypass pipe and valve,
There is a problem that not only a large cost is required for the pressure resistance and leak test, but also a large equipment area is required.

Further, a structure in which a bypass pipe provided with a bypass valve is separately provided from a pressure reducing valve becomes large in size, and the installation area becomes large in a door-to-door house or an apartment house, and the installation place is limited. There is also.

According to the present invention, in a pressure reducing valve for an individual house provided in each door, a bypass valve for bypassing a pressure reducing mechanism of the pressure reducing valve is incorporated, and the bypass valve is opened at the time of a pressure resistance and leak test, and is provided on a primary side of the pressure reducing valve. An object of the present invention is to solve the above-mentioned problem by enabling a high withstand pressure to be applied to be applied directly to the secondary side.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a valve box, a partition wall for dividing the interior of the valve box into a primary chamber and a secondary chamber, A pressure reducing valve portion formed by a fluid passage having a valve seat and a valve disposed so as to be able to contact and separate from the valve seat; and a spring for applying a predetermined valve closing force to the valve body. In the valve, a cylindrical bypass valve body is provided through the side wall of the valve box,
The bypass valve body is communicated with a bypass passage that bypasses the primary chamber and the secondary chamber at the back of the bypass valve body, and a bypass plug that can open and close the bypass passage is attached to the inner diameter portion of the bypass valve body so as to be able to advance and retreat. Configuration.

According to the present invention, the bypass stopper can be moved to a position for opening the bypass passage and a position for closing the bypass passage by rotating the tool engaged with the groove. . Then, when the high pressure pressure is applied to the pressure reducing valve with a built-in bypass valve from the primary port and the bypass valve is opened, the high pressure of the high pressure passes through the pressure reducing valve portion (pressure reducing mechanism) of the pressure reducing valve with a built-in bypass valve. Since the pressure resistance reaches the secondary side of the pressure-reducing valve (pressure-reducing mechanism) and the devices, equipment, piping, etc., it is possible to perform a pressure-resistant test of the door-to-door pressure-reducing valve and equipment, equipment, piping, etc., and the pressure resistance and leak test Therefore, it is not necessary to separately provide a bypass pipe, and the cost of the pressure resistance and leak test can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure reducing valve with a built-in bypass valve according to an embodiment of the present invention shown in FIGS. 1 to 5 will be described below. 1 is a partial cross-sectional side view of an embodiment of a pressure reducing valve with a built-in bypass valve of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a cross-sectional side view of the bypass valve when the valve is closed, and FIG. FIG. 5 is a schematic system diagram of a pressure reducing valve with a built-in bypass valve and devices, instruments, pipes, and the like on the secondary side when opened.

1 and 2, reference numeral 10 denotes a valve box. The inside of the valve box 10 is divided into a primary chamber 10A and a secondary chamber 10B by a partition wall 10f. At each end of the primary chamber 10A and the secondary chamber 10B, a primary port (fluid inlet) 10a and a secondary port (fluid outlet) 10b are provided, respectively, and further, the valve body 13 comes into contact with and separates from the partition wall 10f. A fluid passage 10h is provided, which has a valve seat 10c opposing it. Fluid passage 10h having valve seat 10c and valve seat 1
A valve portion (pressure reducing mechanism) 10C of the pressure reducing valve is constituted by the valve body 13 which is disposed so as to be able to approach and separate from 0c. A flange 10d is formed at an upper portion of the valve box 10, and a spring cover 9 having a cylindrical spring storage portion 9a is attached to the flange 10d by a screw 19. Further, a diaphragm 8 is mounted between the flange 10d and the spring cover 9 with the outer peripheral portion thereof held therebetween.

A doughnut-shaped reinforcing plate 7 is arranged on the upper surface of the diaphragm 8 in close contact with a valve stem 12 at the center opening of the reinforcing plate 7 and at the upper end of the valve stem 12. It is fastened together with the diaphragm 8 by a nut 5 screwed to the formed male screw. Reference numeral 6 denotes a flat washer interposed between the reinforcing plate 7 and the nut 5.

The upper end of the cylindrical spring housing 9a is closed by a removable cap 1, and a coil spring 4 is assembled between the cap 1 and the reinforcing plate 7 in a compressed state. A disk-shaped adjusting screw 3 having a male screw portion on a peripheral edge thereof screwed to a female screw portion formed on the inner peripheral surface of the spring housing portion 9a is screwed onto the upper portion of the coil spring 4. Is rotated to move up and down, whereby the spring force of the coil spring 4, that is, the pressure reducing function of the pressure reducing valve can be adjusted. On the bottom surface of the valve box 10, the valve stem 12 is attached to the valve box 10.
An opening 10g for insertion into the inside is formed, and the opening 10g is usually closed by a lid 18. Lid 1
8 is provided with an O-ring 17 and has an opening 10.
g is performed.

A male screw is formed at the lower end of the valve stem 12 attached to the central opening of the reinforcing plate 7, and the valve body 13 is fixed to the valve stem 12 by a hexagon nut 16 screwed to the male thread. It is attached to the lower end via a valve support 14 and a flat washer 15. In order to guide the valve stem 12 in the vertical direction, a cylindrical guide part 10e is provided inside the valve box 10, and a flange part 12a slidably abutting on the guide part 10e is provided at the center of the valve stem 12. Section. Thus, the guide portion 10e and the flange portion 1
2a constitute a guide portion of the valve stem 12,
An O-ring 11 is provided on the flange portion 12a to seal the guide portion of the valve stem 12.

A cylindrical bypass valve element 24 is provided through the side wall of the valve box 10. The valve body 24 communicates with a bypass passage 25 that communicates the primary chamber 10A and the secondary chamber 10B and bypasses the fluid passage 10h at the back. Further, an internal thread 24a is provided on the inner diameter of the bypass valve body 24.
A bypass plug 22 having a male screw portion 22a screwed to the female screw 24a is attached to the valve body 24 so as to be able to advance and retreat, thereby forming a bypass valve 20. Reference numeral 22b denotes a tool engagement groove formed on the outer end surface of the bypass plug 22.

The bypass plug 22 is formed of a cylindrical main body and a frusto-conical tip, and an O-ring 23 is provided on the cylindrical main body and a O-ring 21 is provided on the frusto-conical tip. Are provided so that the bypass valve 20 is sealed.

The bypass plug 22 is normally pushed in to close the bypass passage 25 as shown in FIGS. When the bypass plug 22 is in this state, the pressure reducing valve with a built-in bypass valve of this embodiment is in a state of operating as a normal pressure reducing valve. When installing a pressure reducing valve with a built-in bypass valve, for example, when performing a pressure resistance and leak test of a toilet, a washroom, a water heater, a faucet, and the like connected to the pressure reducing valve and the secondary side thereof, The stopper 22 is pulled out to a state shown in FIG. 4 by an operation of rotating a tool engaged with the groove 22b.

By this operation, the bypass passage 25 is opened as shown in FIG. Therefore, by applying a high pressure resistance pressure from the primary port 10a to the pressure reducing valve with a built-in bypass valve and opening the bypass valve 20, the pressure reducing valve (pressure reducing mechanism) 10C of the pressure reducing valve with a built-in bypass valve passes through. It is possible to reach the secondary side and equipment, appliances, piping, etc., and it is possible to perform a collective pressure resistance and leak test on the secondary side of appliances, appliances, appliances, piping, etc. of the pressure reducing valve for a door-to-door house, an apartment house.

After the pressure and leak tests are completed, the bypass valve 2
When 0 is closed and the pressure on the secondary side of the pressure reducing valve for a house is reduced, the pressure reducing valve with a built-in bypass valve operates as a normal pressure reducing valve. This withstand pressure and leak test can be performed not only when the pressure reducing valve with a built-in bypass valve is installed, but also according to the same procedure as necessary after the installation, and the cost of the withstand pressure and leak test after the installation is extremely low. Can be.

As described above, in the pressure reducing valve with a built-in bypass valve of this embodiment, since the pressure reducing valve portion (pressure reducing mechanism) 10C and the bypass valve 20 are integrated into the valve box 10, the pressure resistance and leak test are performed. At this time, since the pressure-resistant pressure applied to the primary side of the pressure reducing valve is also directly applied to the secondary side, it is not necessary to separately install a pipe, so that it is possible to reduce the labor and cost of separately installing the pipe. In addition, the above-described test is performed on the pressure reducing valve for each individual house, and a pressure resistance and a leak test for each section are also possible.

[0019]

As described in detail above, according to the present invention,
The following effects can be obtained. (1) The pressure-reducing valve part (pressure-reducing mechanism) and the bypass valve are integrated into the valve box in the pressure-reducing valve with built-in bypass valve. Sometimes, the pressure resistance pressure applied to the primary side can be directly applied to the secondary side without installing a separate pipe, and it is not necessary to install a separate pipe at the time of the pressure resistance and leak test.
The labor and cost for this can be reduced, and the pressure resistance and leak test can be performed at low cost. (2) The pressure resistance and leak test can be performed not only when the pressure reducing valve with a built-in bypass valve is installed, but also according to the same procedure as needed after the installation. Can be done at cost. (3) The above-mentioned pressure resistance and leak test is applicable to the pressure reducing valve for individual door-to-door house, and also the pressure resistance and leak test of each section on the secondary side is possible.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of an embodiment of a pressure reducing valve with a built-in bypass valve of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side sectional view showing the bypass valve when the valve is closed.

FIG. 4 is a side sectional view showing a state when the bypass valve is opened.

FIG. 5 is a schematic system diagram of the pressure reducing valve with a built-in bypass valve and devices, instruments, piping, etc. on the secondary side.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 adjusting screw 4 adjusting spring 8 diaphragm 10 valve box 10A primary chamber 10B secondary chamber 10C valve section of pressure reducing valve (pressure reducing mechanism) 10a primary port 10b secondary port 10c valve seat 10e guide section 10f partition wall 10g opening 10h fluid passage DESCRIPTION OF SYMBOLS 12 Valve stem 13 Valve element 18 Lid 20 Bypass valve 22 Bypass plug 22a Male screw 24 Bypass valve element 24a Female screw 26 Groove for tool engagement

Claims (3)

[Claims] 1. A valve box, a partition wall dividing the interior of the valve box into a primary chamber and a secondary chamber, a fluid passage provided on the partition wall and having a valve seat, and opposed to the valve seat so as to be able to contact and separate therefrom. A pressure reducing valve comprising a pressure reducing valve portion formed by an arranged valve element and a spring for applying a predetermined valve closing force to the valve element, wherein a cylindrical bypass valve penetrates a side wall of the valve box. Body is provided,
The bypass valve body communicates with a bypass passage that bypasses the primary chamber and the secondary chamber at a back portion thereof, and a bypass plug that can open and close the bypass passage is attached to an inner diameter portion of the bypass valve body so as to be able to advance and retreat. A pressure reducing valve with a built-in bypass valve. 2. The pressure-reducing valve with a built-in bypass valve according to claim 1, wherein a female screw is formed in an inner diameter portion of the bypass valve body, and a male screw screwed to the female screw is formed in the bypass plug. 3. The pressure reducing valve with a built-in bypass valve according to claim 1, wherein a groove for tool engagement is formed on an outer end surface of the bypass plug.