JPH0381164B2 - - Google Patents

Description

Detailed Description of the Invention The present invention has a pressure-reducing valve that controls opening and closing of communication between the primary side and the secondary side, which is connected to a pressure-sensitive plate that operates by sensing the secondary pressure, to reduce the pressure on the secondary side. The present invention relates to a pressure reducing valve with a relief valve, which is configured to maintain a pressure within a set pressure and includes a relief valve that releases pressure due to an abnormal increase in pressure on the secondary side.

A pressure reducing valve is usually used in combination with a relief valve, but in the past, the pressure reducing valve and the relief valve were manufactured separately, and there was no one that was combined in one piece. When in use, they were combined and attached separately.

In order to avoid this troublesome installation work, there is a demand for a pressure reducing valve with a relief valve that is integrated with the pressure reducing valve. As shown in the figure,
Abnormal pressure on the secondary side does not pass through the spring case,
We have developed and applied for a pressure reducing valve with a relief valve that allows air to escape from the body of the valve body.

This pressure reducing valve with a relief valve has a pressure sensitive plate 2 attached to the valve box 1 so as to operate by sensing the secondary pressure.
The outer end side of a balancing piston 4 of the pressure reducing valve mechanism 3 installed therein is removably connected, and the body of the valve box 1 is fitted with the outer peripheral surface of the balancing piston 4. A discharge port a leading to the outside is provided in a portion to be kept watertight, a pipe 5 whose one end communicates with the discharge port a is formed inside the balance piston 4, and the other end of the pipe 5 is provided. is formed at the outer end of the piston 4 in a part that is watertightly surrounded by the joint between the outer end and the pressure sensitive plate 2, and the pressure on the secondary side Y is equal to or higher than the set pressure. As I get older,
If the pressure on the secondary side Y becomes abnormally high while the pressure reducing valve mechanism 3 communicates the primary side By hitting the valve seat 3b and being prevented from rising, the pressure plate 2 rises while leaving the balance piston 4, which is connected to the pressure reducing valve 3a and does not move, in that position. The outer end of the piston 4 and the pressure sensitive plate 2 are spaced apart as shown in FIG. A pipe line 5 in the inner cavity of the piston 4, which communicates with
It was designed to allow the air to escape to the outside.

However, in this method, when the pressure on the secondary side Y rises abnormally, the discharge port a provided in the body of the valve box 1, which serves as a relief port, is communicated with the secondary side Y. Since this is carried out using a pipe 5 installed inside the balance valve (balance piston 4) that balances the pressure reducing valve 3a, the balance valve (piston 4) is necessary and the balance valve Since the diameter of the valve body 1 is increased by providing the pipe line 5 therein, a problem has arisen in which the entire valve body 1 is made larger.

The present invention has been made to solve this problem, and is designed so that abnormal pressure on the secondary side escapes to the outside of the valve box without passing through the inside of the spring case in which the spring that presses the pressure sensitive plate is housed. The present invention aims to provide a new means for obtaining a pressure reducing valve with a relief valve in a compact form without using a balance valve to open and close the relief valve.

In the present invention, as a means to achieve this objective, the opening and closing of communication between the primary side and the secondary side is controlled within the valve box in which a pressure sensitive plate that is activated by sensing the pressure on the secondary side is assembled. A pressure reducing valve mechanism is constructed of a movable cylindrical valve and a valve seat facing it, and is assembled in such a manner that the movable direction of the cylindrical valve is aligned with the operating direction of the pressure sensitive plate, and the cylindrical valve is A relief valve mechanism consisting of a relief valve and a relief valve seat is installed at the connection portion, and the pressure sensitive plate is connected to the pressure sensitive plate via a connection member installed in the inner cavity of the pressure plate. This invention proposes a pressure reducing valve with a relief valve in which a discharge port communicating with a relief valve opening is installed in a valve box.

Next, an example of implementation will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings as in the conventional means are used for constituent members having the same effect.

Figure 3 shows a pressure reducing valve A with a relief valve that can implement the present invention.
1 is a front view taken longitudinally. In the same figure, 1 is a valve box,
2 is a pressure sensitive plate assembled into the valve box 1 to operate by sensing secondary pressure, and 3 is a pressure reducing valve built into the valve box 1 to control opening and closing of communication between the primary side X and the secondary side Y. 30 is a cylindrical valve of the pressure reducing valve mechanism 3; 31 is a valve seat facing the cylindrical valve 30; b is a connecting member connecting the cylindrical valve 30 and the pressure sensitive plate 2; 6 is a relief valve mechanism; 60 61 is a relief valve seat of the relief valve mechanism 6, 62 is a relief valve port, and a is a discharge port serving as a relief port.

The valve box 1 has a water inlet 10 formed on one side (the left side in FIG. 3) formed into a connecting pipe for connecting a pipe leading to a water faucet, etc., and a connection pipe for connecting a pipe leading to a boiler etc. on the other side. It is equipped with a water outlet 11 formed in a pipe, and a pressure sensitive plate 2 that is activated by sensing the fluctuation in the pressure on the secondary side Y communicating with the water outlet 11 is assembled on the upper surface side, and inside the water inlet. A cylindrical cylindrical part 13 with the axial direction as the vertical direction is provided in the partition wall 12 that separates the primary side X communicating with the water outlet 10 from the secondary side Y communicating with the water outlet 11. .

A cylindrical valve 30 of the pressure reducing valve mechanism 3 is fitted into this cylindrical portion 13 so as to be vertically movable with the axial direction being the vertical direction. The fitting between the cylindrical valve 30 and the cylindrical part 13 is such that on the upper half side of the cylindrical valve 30, a flow path W is formed between the outer peripheral surface of the cylindrical valve 30 and the inner peripheral surface of the cylindrical part 13. The lower half of the cylindrical valve 30 is loosely fitted into the cylindrical valve 30, and the lower half of the valve 30 is fitted in a watertight manner. This is done through the flow path W on the outer periphery of the .

A valve seat 31 of the pressure reducing valve mechanism 3 facing the cylindrical valve 30 is held by an annular mounting fitting 31a and attached to the upper opening of the cylindrical portion 13. By connecting with the cylindrical valve 30 and blocking the flow path W, the communication between the primary side The flow path W communicates with the secondary side through the hole.

Further, the cylindrical valve 30 has a bottom plate-shaped partition wall 30 at the lower part of the inner cavity thereof, which crosses the inner cavity perpendicularly to the axial direction.
a, and upper and lower penetration is blocked by the partition wall 30a.

A connecting member b that connects the cylindrical valve 30 to the pressure sensitive plate 2 is formed in a sleeve, and its lower end side is connected to the central portion of the partition wall 30a by screwing,
The upper end side protrudes upward from the upper opening part of the cylindrical valve 30, and the upper end side is further connected to the above-mentioned valve seat 31.
It protrudes upward through the center hole of the mounting bracket 31a, and abuts against the lower surface of the central portion of the pressure-sensitive plate 2 so as to be able to move toward and away from it, and is connected to the pressure-sensitive plate 2 through this abutment.

A relief valve 60 in the form of a cylindrical valve is formed on the upper edge of the cylindrical connecting member b at the connecting portion between the connecting member b formed on the sleeve and the pressure sensitive plate 2, and the inside of the relief valve 60 is formed in the form of a cylindrical valve. By forming the relief valve port 62 and attaching the relief valve seat 61 to the lower surface of the pressure-sensitive plate 2, the connection member b is disconnected from the pressure-sensitive plate 2, and the relief valve 60 becomes the relief valve seat. A relief valve mechanism 6 that operates to open the valve is configured apart from the valve 61.

Further, the discharge port a, which serves as a relief port, is opened at a portion of the bottom wall of the valve box 1 located below the connecting member b, and the discharge port a is provided through a conduit formed in the inner cavity of the connecting member b. It communicates with a valve mechanism 6, and when the relief valve mechanism 6 opens, the pressure on the secondary side Y is discharged to the outside through the pipe formed in the inner cavity of the connecting member b. .

7 is a spring case installed on the outside of the pressure sensitive plate 2;
It also serves as an assembly member for the pressure-sensitive plate 2, and the pressure-sensitive plate 2
is assembled on the upper surface of the valve housing 1 while the upper surface of the valve housing 1 is assembled on the upper surface side of the valve housing 1. And inside it is a pressure sensitive plate 2
A spring 70 that presses the spring 70 downward is housed therein, and an adjustment lid 71 that adjusts the spring pressure of the spring 70 is screwed onto the top.

Further, 8 is a spring connected to the cylindrical valve 30 of the pressure reducing valve mechanism 3 so as to push the cylindrical valve 30 toward the pressure sensitive plate 2, and is connected to the bottom wall 1a of the valve box 1 provided with the above-mentioned discharge port a.
and the cylindrical valve 30.

In the illustrated embodiment, 90 is a check valve built into the primary side X in the valve box 1, 91 is a strainer, and 92 is a negative pressure operating mechanism.

The embodiment device constructed in this manner operates as follows.

Since the cylindrical valve 30 of the pressure reducing valve mechanism 3 that controls the opening and closing of communication between the primary side X and the secondary side Y is a cylindrical valve, it does not receive pressure from the primary side There is no balance valve to balance the pressure on the side X, and the pressure on the secondary side Y is
When the pressure becomes lower than the set pressure set by the spring pressure of the spring 70 pushing down and the spring pressure of the spring 8 pushing up the cylindrical valve 30, the pressure sensitive plate 2 is pushed down by the spring 70, and the pressure sensitive plate 2 is activated. The cylindrical valve 30 moves downward and separates from the valve seat 31 by the connecting member b moving downward, and the pressure reducing valve mechanism 3 is opened and the pressure on the primary side X is sent to the secondary side Y. When the pressure on the secondary side Y decreases, the pressure sensitive plate 2 moves further downward, moves the cylindrical valve 30 further down, widens the opening of the valve, sends a large amount of pressure to the secondary side Y, and Increase the pressure on side Y. As a result, when the pressure on the secondary side Y rises to near the set pressure, the pressure sensitive plate 2 is pushed up by the pressure, and the cylindrical valve 30 pushed up by the spring 8 follows the pressure sensitive plate 2. When the pressure on the secondary side Y reaches the set pressure, the cylindrical valve 30 comes into contact with the valve seat 31 and becomes closed, and the opening of the valve on the secondary side Y reaches the set pressure. The pressure will be maintained at the set pressure.

During the operation of this pressure reducing valve mechanism 3, the connecting portion between the connecting member b and the pressure sensitive plate 2 is held in a connected state by a spring 70 that pushes down the pressure sensitive plate 2 and a spring 8 that pushes up the cylindrical valve 30. . Therefore, during this operation, the relief valve mechanism 6 is maintained in a closed state.

Next, when the pressure reducing valve mechanism 3 is in the closed state (the state shown in Fig. 3), if the pressure on the secondary side Y increases abnormally for some reason, the pressure sensitive plate 2 will be activated by the pressure. However, the cylindrical valve 30 is pushed up by the valve seat 3.
1 and does not move upward, the relief valve seat 61 of the relief valve mechanism 6 provided on the lower surface of the pressure sensitive plate 2 and the relief valve 60 provided on the linking member b are separated, and The relief valve mechanism 6 is in an open state, and the secondary side Y
The pressure passes from the opened relief valve port 62 through the lumen conduit of the connecting member b formed in the sleeve,
The water is discharged to the outside through a discharge port a provided in the bottom wall 1a of the valve box 1.

Next, FIG. 4 shows a modification of the embodiment shown in FIG. 3.

In this embodiment, the connecting member b that connects the cylindrical valve 30 of the pressure reducing valve mechanism 3 and the pressure sensitive plate 2 is formed integrally with the cylindrical valve 30, and the connecting member b connects the cylindrical valve 30 and the pressure sensitive plate 2. It extends downward as a sleeve from the bottom plate-shaped partition wall 30a provided across the inner cavity of the valve body 1, and its lower end side is slid into the discharge port a opened in the bottom wall 1a of the valve box 1 in a watertight manner. The spring 8 that pushes up the cylindrical valve 30 is fitted so that it can move freely.
The spring chamber 80 accommodating the valve body is communicated with the secondary side Y through the communication port 81 in a state where it is watertightly cut off from the outside of the valve box 1 by the downwardly extending portion of the connecting member b. Except for this point, the rest of the configuration is the same as the apparatus of the embodiment shown in FIG. 3, so the same components will be designated by the same reference numerals and detailed explanations will be omitted.

Since this embodiment has the same main structure as the embodiment shown in FIG. 3, it functions in the same manner as the embodiment shown in FIG. Since the pressure on the secondary side Y is applied, an advantage can be obtained without considering the pressure on the cylindrical valve 30 of the pressure on the secondary side Y.

Next, FIG. 5 shows another embodiment of the apparatus.

This embodiment device includes a cylindrical valve 30 of a pressure reducing valve mechanism 3.
A connecting member b that connects the pressure sensitive plate 2 and the pressure sensitive plate 2 is formed in the shape of a shaft rod, and its upper end is fixedly connected to the pressure sensitive plate 2, and the lower end thereof and the partition wall 30a provided in the inner cavity of the cylindrical valve 30 in the shape of a bottom plate. The cylindrical valve 30 and the pressure sensitive plate 2 are connected via the connecting member b by colliding with each other so that they can move toward and away from each other, and the relief valve 60 of the relief valve mechanism 6 is A relief valve seat 61 is installed at the center of the bottom plate-shaped partition wall 30a of the cylindrical valve 30, and an opposing relief valve seat 61 is installed at the lower end of the rod-shaped connecting member b. 62 is provided at the center of the bottom plate-shaped partition 30a of the cylindrical valve 30 so as to vertically penetrate the partition 30a, which is different from the apparatus of the embodiment shown in FIG. . The rest of the configuration is explained in the third section above.
Since it is the same as the embodiment shown in the figures, the same constituent members will be given the same reference numerals and detailed explanations will be omitted.

This embodiment operates in the same manner as the embodiment device shown in FIG. The provided relief valve mechanism 6 is housed in the inner cavity of the cylindrical valve 30 of the pressure reducing valve mechanism 3, so that the valve box 1 is reduced by the amount of the relief valve mechanism 3.
It becomes possible to reduce the vertical height of

Next, FIG. 6 shows a further different embodiment.

This embodiment is a modification of the embodiment shown in FIG. This is done by the abutment between the connecting member b, which is formed into a shape and is fixedly connected to the pressure sensitive plate 2 side, and the bottom plate-shaped partition wall 30a of the cylindrical valve 30, and is installed at the abutting part that becomes the connecting part. The relief valve mechanism 6 is housed in the inner cavity of the cylindrical valve 30 of the pressure reducing valve mechanism 3, which is the same as the embodiment shown in FIG. bottom plate-shaped partition wall 30
A sleeve 63 is provided vertically on the lower surface side of a so as to extend downwardly the relief valve port 62 opened there, and the lower end side of the sleeve 63 is connected to the valve box 1.
A spring chamber 80 is fitted into a discharge port a, which serves as an escape port, provided in the bottom wall 1a of the bottom wall 1a so as to maintain watertightness and freely slide. It is communicated with the secondary side Y via. Regarding other configurations,
Since this is the same as the apparatus of the embodiment shown in FIG. 3 described above, the same constituent members will be given the same reference numerals and detailed explanations will be omitted.

This embodiment device operates in the same manner as the embodiment device shown in FIG. The pressure of the secondary side Y is applied to both the upper and lower sides of the cylindrical valve 30, and the benefit of being balanced against the secondary pressure can be obtained.

As explained above, the pressure reducing valve with a relief valve according to the present invention controls the opening and closing of the communication between the primary side and the secondary side in the valve box in which a pressure sensitive plate that is activated by sensing the pressure on the secondary side is assembled. A pressure reducing valve mechanism is constructed of a movable cylindrical valve and a valve seat facing it, and is assembled in such a manner that the movable direction of the cylindrical valve is aligned with the operating direction of the pressure sensitive plate, and the cylindrical valve is A relief valve mechanism consisting of a relief valve and a relief valve seat is installed at the connection portion, and the pressure sensitive plate is connected to the pressure sensitive plate via a connection member installed in the inner cavity of the pressure plate. Since the valve box is equipped with a discharge port that leads to the relief valve port, abnormal pressure on the secondary side of the valve does not pass through the spring case that houses the spring that presses the pressure-sensitive plate. A pressure reducing valve with a relief valve that allows the air to escape from the box can be obtained in a compact form without using a balance valve to open and close the relief valve.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a conventional pressure reducing valve with a relief valve, Fig. 2 is a longitudinal sectional side view of the same as above, Fig. 3 is a longitudinal sectional front view of an embodiment of the device of the present invention, and Fig. 4 is another embodiment of the device. FIG. 5 is a longitudinal sectional front view of another embodiment, and FIG. 6 is a longitudinal sectional front view of yet another embodiment. Explanation of drawing symbols, A...Pressure reducing valve with relief valve, X...
Primary side, Y...Secondary side, a...Discharge port, b...Connection member, 1...Valve box, 1a...Bottom wall, 10...Water inlet, 11
... Water outlet, 12 ... Partition wall, 13 ... Cylindrical part, 2 ... Pressure sensitive plate, 3 ... Pressure reducing valve mechanism, 3a ... Pressure reduction valve, 3b ... Pressure reduction valve seat, 30 ... Cylindrical valve, 30a ... Partition wall, 31 ...
Valve seat, 31a...Mounting bracket, 4...Piston, 5
...Pipe line, 6...Relief valve mechanism, 60...Relief valve, 61
...Relief valve seat, 62...Relief valve port, 63...Sleeve, 7...Spring case, 70...Spring, 71...Adjustment lid, 8...Spring, 80...Spring chamber, 81...Communication port, 9
0...Check valve, 91...Strainer, 92...Negative pressure operation mechanism, W...Flow path.

Claims (1)

[Claims] 1 A pressure reducing valve mechanism that controls the opening and closing of communication between the primary side and the secondary side is installed in a valve box equipped with a pressure sensitive plate that senses the pressure on the secondary side and is activated, with a movable cylindrical valve facing it. The cylindrical valve is assembled in such a manner that the moving direction of the cylindrical valve is aligned with the operating direction of the pressure-sensitive plate, and the cylindrical valve is connected to the pressure-sensitive plate via a connecting member installed in the inner cavity of the cylindrical valve. A relief valve mechanism consisting of a relief valve and a relief valve seat is installed at the connection part, and a discharge port leading to the relief valve opening that opens and closes is installed in the valve box. A pressure reducing valve with a relief valve.