JPH0418017Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic pressure control valve that can automatically switch the set pressure on the secondary side into two stages: high pressure and low pressure.

[Conventional technology]

In water supply equipment such as water supply, excessive water pressure is applied to the secondary side of the pressure reducing valve due to the difference in water usage during the day and night, and this causes damage to the secondary side piping connections and faucets at the end of the water supply. To prevent water from leaking from defective areas, for example,
As shown in Japanese Patent No. 29887, an automatic pressure control valve is known that can automatically switch the pressure on the secondary side into two stages depending on the amount of water used.

In this automatic pressure control valve, a partition wall defines the inside of the valve box into a primary side and a secondary side, and a main valve element for opening and closing an opening formed in the partition wall is connected to the secondary side inside the valve box. The main valve is slidably inserted into the cylinder part provided on the upper side, and defines a pressure chamber above the main valve body in the cylinder part, and the main valve has a small hole in the main valve body through which a needle installed upright in the valve box is inserted. The primary side and the pressure chamber are communicated through a bypass flow path consisting of a through hole in the upper part of the body, and a valve shaft of a main valve body that is operated by a change in fluid pressure on the secondary side is connected to the upper part of the valve box. A switching valve equipped with a valve body that opens and closes is provided, and a low-pressure pilot valve and a high-pressure pilot valve with different set pressures are interposed in a pilot pipe that communicates the switching valve with the secondary side.

The switching valve used in this automatic pressure control valve is provided with an outer cylinder in the upper part of the valve box, which has an upper drain port that communicates with the high-pressure pilot valve and a lower drain port that communicates with the low-pressure pilot valve. The interior of the pressure chamber is in communication with the pressure chamber. An adjustment rod is inserted into the outer cylinder, the upper end of the adjustment rod is screwed into the upper part of the outer cylinder, and the lower end of the adjustment rod is provided with a guide cylinder whose lower part is open. At the center of the inner periphery of the outer cylinder,
An annular passage communicating with the upper drainage port is formed, the passage communicates with the inside of the guide cylinder through a through hole formed in the guide cylinder, and a lower part of the inner periphery of the outer cylinder is connected to the pressure chamber. An annular passage communicating with the lower drainage port is formed. The above-mentioned valve body is inserted into the guide cylinder so as to be movable in the vertical direction, and is opened and closed by a valve shaft of the main valve body, which is actuated by a change in fluid pressure on the secondary side.

[The problem that the idea attempts to solve]

However, this valve body is integrally formed with the upper end of the valve stem whose lower end is fixed to the main valve body.
It has a larger diameter than the valve stem and has a length of about one stroke.

Therefore, the switching valve requires a guide tube with a hollow portion long enough to accommodate a large-diameter valve body with a length of about one stroke and a length that allows the valve body to move one stroke, and the position of the guide tube is In order to be able to move about one stroke for vertical adjustment, the outer cylinder has a length of about three strokes, resulting in increased material and processing costs for the switching valve.

In addition, in the automatic pressure control valve, the main valve body constantly moves and repeats opening and closing operations under low pressure conditions, so the valve body of the switching valve also constantly slides vertically within the guide cylinder, and has a large diameter. Since a step is formed between the valve body and the valve stem, the step easily damages the lower part of the guide cylinder, and the guide cylinder lacks durability, making it difficult to connect a large diameter valve body and guide. There is a risk that the sealing performance between the cylinder and the cylinder will deteriorate, and if the seal becomes defective, the high-pressure pilot valve will operate, impairing the original function of the automatic pressure control valve.

Therefore, an object of the present invention is to provide an automatic pressure control valve that reduces the length of the switching valve to reduce the material and processing costs of the switching valve and improves the sealing performance of the switching valve.

[Means to solve the problem]

In this invention, in order to solve the above problems,
A main valve body that opens and closes an opening formed in a partition wall that defines the inside of the valve box into a primary side and a secondary side is slidably inserted into the opening, thereby creating a pressure chamber defined inside the valve box. and the primary side are communicated by a bypass pipe, and the pressure chamber and the secondary side are communicated by a pilot pipe, a low pressure pilot valve is interposed in the pilot pipe, a switching valve is provided on the upper part of the valve box, and the switching valve is connected to the In an automatic pressure control valve that communicates the pressure chamber with the secondary side via a valve, a high-pressure pilot valve, and a pilot pipe, the switching valve includes a water inlet communicating with the pressure chamber at an upper portion and a high-pressure pilot valve at a lower portion. An outer cylinder having a communicating drain port is provided at the top of the valve box, an adjustment rod is inserted into the outer cylinder, the upper end of the adjustment rod protrudes from the upper part of the outer cylinder, and the lower end of the adjustment rod has a lower part. A guide tube is provided that is open and has a communication hole in the upper part, and the valve body that opens at the valve shaft of the main valve body that is operated by changes in fluid pressure on the secondary side and closes due to fluid pressure is guided by the valve body. It is characterized by being stored inside a cylinder.

[Effect]

With the above configuration, the guide cylinder of the switching valve can be made long enough to allow the valve shaft of the main valve body to move approximately one stroke, and the outer cylinder can be used to adjust the position of the guide cylinder in the vertical direction. The total length of the outer cylinder is approximately 2 strokes.
This increases the stroke length, reducing material costs and processing costs for the switching valve.

In addition, even if the main valve body repeatedly opens and closes, the valve body of the switching valve does not slide against the valve seat in the guide cylinder, so the sealing performance in the guide cylinder does not deteriorate, resulting in stable operation. is obtained.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

A globe-shaped automatic pressure control valve 1 installed on a water supply pipe has a valve box 2 divided into a primary side and a secondary side by a partition wall 3. An opening 3a communicating between the main valve body and the secondary side is provided, and the main valve body 4 is fitted into the opening 3a so as to be slidable in the vertical direction.

Further, the peripheral flange portion 2b of the lid body 2a of the valve box 2
and the peripheral edge portion 5a between the upper flange portion 2c of the valve body 2.
A pressure chamber 7 is defined in the upper part of the primary side of the valve box 2 by the diaphragm 5 whose center portion is held between the diaphragm retainer 6 and the main valve body 4. A valve shaft 10 is installed in the center of the diaphragm retainer 6, which liquid-tightly penetrates a valve bearing 9 fixed to the lid body 2a with a lock nut 8, and is slidable in the vertical direction together with the main valve body 4. has been done. The valve bearing 9 is provided with a switching valve 11 .

This switching valve 11 has an upper cylinder 1 divided into upper and lower halves.
The valve bearing 9 is fitted into the lower part of the lower cylinder 13. A water inlet 12b is formed in the upper part of the upper cylinder 12, and a drain port 13b is formed in the lower part of the lower cylinder 13, respectively. The outer cylinder 11
A guide tube 14 is inserted into the inside a so as to be movable in the vertical direction. This guide cylinder 14 has a bearing 17 attached to its upper part, and the lower end of the adjustment rod 18 is connected to a pin 19.
It is installed by The upper end of the adjustment rod 18 passes through the upper cylinder 12 in a liquid-tight manner and projects to the upper part of the upper cylinder 12.

A valve seat 15 is fitted into the lower part of the guide cylinder 14, and a valve body 16 is accommodated in the guide cylinder 14, which seats on the valve seat 15 and closes the lower part of the guide cylinder 14. This valve body 16 opens at the valve shaft 10 of the main valve body 4, which is actuated by a change in fluid pressure on the secondary side.
The valve closes due to fluid pressure.

Thereby, the switching valve 11 has the outer cylinder 11a,
A first hydraulic pressure chamber 20 having a water inlet 12b, a second hydraulic pressure chamber 20 having a water inlet 12b, and a second
It is divided into three chambers: a hydraulic pressure chamber 21 and a third hydraulic pressure chamber 22 having a drain port 13b, and the first hydraulic pressure chamber 20 and the second hydraulic pressure chamber 21 are formed in the bearing 17 at the upper part of the guide cylinder 14. They are communicated through a communication hole 17a.

On the other hand, a bypass pipe 25 in which a strainer 23 and a throttle valve 24 are interposed is connected between the primary side of the valve box 2 and the pressure chamber 7, thereby communicating the primary side of the valve box 2 and the pressure chamber 7. has been done.

A pilot pipe 26 communicating the pressure chamber 7 with the secondary side is provided with a low pressure pilot valve 27 and a high pressure pilot valve 28 for setting the pressure of water flowing down to the secondary side to a predetermined pressure. That is, the pilot pipe 26 has a first pipe 26a connected to the pressure chamber 7 and is branched into two downstream parts, one of which is connected to the switching valve 11.
It is connected to the water inlet 12b at the top of the upper cylinder 12 to communicate the pressure chamber 7 and the first hydraulic pressure chamber 20, and the other side is connected to the primary side of the low pressure pilot valve 27. Further, the primary side of the high pressure pilot valve 28 is connected downstream of the second pipe 26b connected to the drain port 13b of the lower cylinder 13 of the switching valve 11, and both pilot valves 27,
The secondary sides of 28 merge downstream and are connected to the secondary side of the valve box 2 by a third pipe 26c.

Next, the operation of the automatic pressure control valve 1 configured as described above will be explained.

For example, at night when water usage is low,
Since the main valve body 4 has a small opening degree, the valve body 16 of the switching valve 11
is separated from the valve stem 10, and is seated on the valve seat 15 due to the water pressure within the switching valve 11, so that the valve is in a closed state.

At this time, water in the automatic pressure control valve 1 flows from the primary side to the secondary side through the opening 3a of the partition wall 3, and also flows from the primary side of the valve box 2 → bypass pipe 25 → pressure chamber 7 → pilot piping 26. Flows from the first pipe 26a to the low pressure pilot valve 27 to the third pipe 26c to the secondary side of the valve box 2, and the low pressure pilot valve 27 connects the valve box 2.
The secondary side of is set at low pressure. As a result, excessive pressure is not applied to the connection part of the piping located on the secondary side, the faucet at the end of the water supply, etc., and water leakage can be effectively prevented.

During the day when the amount of water used increases, the main valve body 4
The opening degree of the main valve body 4 increases and the main valve body 4 moves upward in the figure.
As a result, the valve body 16 of the switching valve 11 is pushed up by the valve shaft 10, and the switching valve 11 becomes open.

At this time, inside the automatic pressure control valve 1, water flows through the partition wall 3.
A large amount flows from the primary side to the secondary side through the opening 3a of the valve box 2, and from the primary side of the valve box 2 to the bypass pipe 25.
→ Pressure chamber 7 → First pipe 26 of pilot pipe 26
a → first hydraulic pressure chamber 20 of switching valve 11 → communication hole 17a
→Second hydraulic chamber 21→Third hydraulic chamber 22→Second piping 2
6b → High pressure pilot valve 28 → Third pipe 26c →
The high pressure pilot valve 28 sets the secondary side of the valve body 2 at high pressure.

Then, when the amount of water used decreases again, the opening degree of the main valve body 4 becomes smaller and the switching valve 11 becomes closed, and the flow of water becomes the same as that at night when the amount of water used is small. The secondary side of box 2 is set to low pressure.

Note that the guide tube 14 is adjusted by the adjustment rod 18 of the switching valve 11.
By changing the position of the valve stem 10 and the valve body 1,
6, the timing of switching between high pressure and low pressure can be changed, and the adjustment rod 18 may be operated remotely by using an electric system or the like.

[Effect of idea]

As explained above, the present invention defines the inside of the valve box into the primary side and the secondary side with the partition wall, communicates the pressure chamber defined inside the valve box with the primary side through the bypass pipe, and
The pressure chamber and the secondary side are communicated through pilot piping,
A low pressure pilot valve is interposed in the pilot piping,
A switching valve is provided in the upper part of the valve box, and the pressure chamber and the secondary side are communicated through the switching valve, a high pressure pilot valve, and pilot piping, and the switching valve is connected to a water inlet port communicating with the pressure chamber in the upper part. An outer cylinder having a drain port communicating with the high-pressure pilot valve at the lower part, an adjustment rod inserted into the outer cylinder and having an upper end protruding above the outer cylinder, and an adjustment rod provided at the lower end of the adjustment rod, the lower part of which is open. death,
The valve is opened by the valve shaft of the main valve body, which opens and closes the opening formed in the guide tube with a communication hole at the top and the partition wall that is activated by changes in fluid pressure on the secondary side, and the valve is closed by fluid pressure. Since it is constructed with a valve body, the guide cylinder of the switching valve can be made long enough to allow the valve shaft of the main valve body to move approximately one stroke, and the outer cylinder can be used to adjust the position of the guide cylinder in the vertical direction. Since the length can be set to allow movement of approximately 1 stroke, the total length of the outer cylinder is approximately 2 strokes long, which reduces material costs and processing costs for the switching valve compared to conventional switching valves that have a length of approximately 3 strokes. Costs can be reduced.

In addition, even if the main valve body repeatedly opens and closes, the valve body of the switching valve does not slide against the valve seat in the guide cylinder, so the sealing performance in the guide cylinder does not deteriorate, resulting in stable operation. is obtained.

[Brief explanation of drawings]

The figure is a sectional front view of an automatic pressure control valve showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... automatic pressure control valve, 2... valve box, 3... partition, 3a... opening, 4... main valve body, 5... diaphragm, 6... diaphragm holder, 7... pressure chamber, 9 ... Valve bearing, 10 ... Valve shaft, 11 ... Switching valve, 11a ... Outer cylinder, 12 ... Upper cylinder, 12b ...
Water inlet, 13... Lower tube, 13b... Drain port, 14
... Guide cylinder, 15 ... Valve seat, 16 ... Valve body, 17
... Bearing, 17a ... Communication hole, 18 ... Adjustment rod,
23... Strainer, 24... Throttle valve, 25...
Bypass pipe, 26...Pilot pipe, 26a...
...First pipe, 26b...Second pipe, 26c...Third pipe, 27...Low pressure pilot valve, 28...High pressure pilot valve.

Claims (1)

[Scope of utility model registration request] A partition wall 3 that defines the inside of the valve box 2 into a primary side and a secondary side.
A main valve body 4 that opens and closes an opening 3a formed in
It is slidably inserted into the opening 3a, and communicates the pressure chamber 7 defined in the valve box 2 with the primary side through a bypass pipe 25, and connects the pressure chamber 7 and the secondary side with a pilot pipe 26. A low pressure pilot valve 27 is interposed in the pilot pipe 26, and a switching valve 11 is provided on the upper part of the valve box 2. In the automatic pressure control valve 1 communicating with the next side, the switching valve 11 has a water inlet 12b communicating with the pressure chamber 7 at the top and a high pressure pilot valve 2 at the bottom.
An outer cylinder 11a having a drain port 13b communicating with the valve body 8 is provided on the upper part of the valve box 2, and an adjustment rod 18 is attached to the outer cylinder 11a.
is inserted, the upper end of the adjustment rod 18 protrudes above the outer cylinder 11a, and the lower end of the adjustment rod 18 is provided with a guide cylinder 14 that is open at the bottom and has a communication hole 17a at the top. An automatic pressure control valve characterized in that a valve body 16 that opens at the valve stem 10 of the main valve body 4 and closes due to the fluid pressure is housed in the guide tube 14. .