JPH0665910U - Pressure control valve - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a pressure control valve with excellent corrosion resistance. [Structure] Primary pressure inlet; secondary pressure outlet; main valve for opening and closing communication passage between primary pressure inlet and secondary pressure outlet; spring means for urging the main valve in the valve closing direction And; equipped with a diaphragm that moves according to the pressure of the secondary pressure outlet,
When the pressure at the secondary pressure outlet drops below the set pressure,
A diaphragm structure for opening the main valve against the spring means; and a spring means for supporting the main valve on the diaphragm assembly and biasing the main valve in a closing direction,
A pressure control valve arranged on the back surface of the diaphragm that is not in communication with the primary pressure inlet and the secondary pressure outlet.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to a pressure control valve.

[0002]

[Prior art and its problems]

 The pressure control valve is a valve that changes the outlet secondary pressure according to the set pressure, and basically has a main valve that opens and closes the communication passage between the primary pressure inlet and the secondary pressure outlet. While the valve is normally biased in the valve closing direction by spring means, a diaphragm structure is provided that opens the main valve against this spring means when the pressure at the secondary pressure outlet drops below the set pressure. According to this pressure regulating valve, when the diaphragm structure opens the main valve, that is, when the pressure on the secondary pressure outlet side falls, the pressure at the primary pressure inlet is exerted on the secondary pressure outlet to exert pressure on the secondary pressure outlet. When the pressure on the secondary side is high, on the contrary, when the pressure on the secondary side is high, the main valve urged in the valve closing direction by the spring means closes the communication passage, and the high pressure on the primary pressure side is increased to the secondary side. Prevent being introduced.

Although this pressure control valve is used for various purposes, it has been found that there are the following problems when it is used for controlling a corrosive fluid. That is, the spring means for urging the main valve in the valve closing direction has to be arranged in the flow path in the conventional structure. However, since the conventional spring means is made of a metallic material, it is corroded by a corrosive fluid due to long-term use, and as a result, the main valve closing force is weakened or the valve closing force is lost. There was something to do. When the valve closing force is weakened or lost, the function as a pressure regulating valve is impaired. In addition, the presence of the spring causes particles to be generated or a liquid pool.

[0004]

[The purpose of the device]

 The present invention is based on the above-mentioned awareness of the problems of the conventional pressure regulating valve, and the spring means for urging the main valve in the closing direction is not corroded. Aim to get. Another object of the present invention is to obtain a pressure regulating valve that does not cause particles or liquid accumulation.

[0005]

[Outline of the device]

 The present invention reconsiders the conventional wisdom that the spring means for urging the main valve in the valve closing direction must be arranged in the flow path, and as a result, the main valve is supported on the diaphragm assembly side. It was completed by discovering that the main valve biasing spring can be arranged in addition to the flow path.

That is, the present invention provides a primary pressure inlet; a secondary pressure outlet; a main valve that opens and closes a communication passage between the primary pressure inlet and the secondary pressure outlet; A urging spring means; and a diaphragm that moves according to the pressure of the secondary pressure outlet, and opens the main valve against the spring means when the pressure of the secondary pressure outlet drops below the set pressure. In the pressure regulating valve having a diaphragm structure, the main valve is supported by the diaphragm assembly, and the spring means for urging the main valve in the valve closing direction is connected to the primary pressure inlet port and the secondary pressure outlet port. Is characterized by being placed in the room on the back side of the non-communicating diaphragm. The main valve can, for example, be coupled for movement with the diaphragm assembly. Alternatively, the main valve can be supported movably with respect to the diaphragm assembly and urged to move toward the diaphragm assembly.

[0007]

[Example of device]

 The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a first embodiment of the present invention. The housing 11 is divided into an upper housing 11a, an intermediate housing 11b, and a lower housing 11c, which are joined by a fastening screw (not shown). A primary pressure inlet 12 and a secondary pressure outlet 13 are opened in the intermediate housing 11b, and a communication passage 16 is formed between the primary pressure inlet 12 and the secondary pressure outlet 13.

A main valve 17 is opened and closed in the communication passage 16, and a valve seat 16a is formed at a lower end portion of the communication passage 16 so that a conical valve portion 17a of the main valve 17 comes into contact with and separates from the valve seat 16a.

An inner housing 11d is inserted between the upper housing 11a and the intermediate housing 11b, and a peripheral bead portion 23a of the diaphragm 23 is sandwiched between the inner housing 11d and the intermediate housing 11b. . A back plate 24 is located on the upper surface of the diaphragm 23, and the diaphragm 23 and the back plate 24 form a diaphragm structure 25. The pressure on the secondary pressure outlet 13 side is exerted on the lower surface of the diaphragm 23 of the diaphragm structure 25.

According to the present invention, the main valve 17 is supported by the diaphragm structure 25, and the coil spring 20 that applies a biasing force to the main valve 17 in the valve closing direction is provided on the back surface of the diaphragm 23, that is, the primary The pressure inlet 12 and the secondary pressure outlet 13 are characterized in that they are arranged in an atmosphere open chamber 19 that is not in communication.

This embodiment is an embodiment in which the main valve 17 and the diaphragm structure 25 are directly connected to each other. A through hole 25a is formed at the center of the diaphragm structure 25, and the atmosphere opening chamber is formed in the through hole 25a. A connecting rod 17b inserted from the 19 side integrally connects the main valve 17 and the diaphragm structure 25. A coil spring (valve closing direction biasing spring) 20 for biasing the main valve 17 in the valve closing direction is inserted between the spring bearing flange 24a formed on the back plate 24 and the inner housing 11d. There is. The valve closing direction urging spring 20 is located in the atmosphere opening chamber 19 and does not come into contact with the fluid on the primary pressure introducing port 12 side and the secondary pressure extracting port 13 side.

A compression spring 27 is inserted between the diaphragm structure 25 and the spring receiving plate 26 in the upper housing 11 a to move the diaphragm structure 25 and the main valve 17 downward, that is, the main valve 17. Pushes the communication passage 16 in the opening direction. The force of the compression spring 27 is set to be sufficiently stronger than the force of the valve closing direction biasing spring 20, and therefore, when the pressure in the secondary pressure outlet 13 is low, the main valve 17 is continuously connected. Open the passage 16. On the other hand, when the pressure on the secondary pressure outlet 13 side overcomes the force of the compression spring 27, the diaphragm structure 25 and the main valve 17 are displaced upward. The valve closing direction biasing spring 20 ensures that the main valve 17 then moves in the valve closing direction and its conical valve part 17a seats on the valve seat 16a.

The spring bearing plate 26 has a guide protrusion 29, and the guide protrusion 29 is fitted in a straight guide groove 28 formed in the upper housing 11a. Therefore, the spring bearing plate 26 can move linearly toward the diaphragm structure 25, and the male screw portion 30a of the pressure adjusting screw 30 is screwed to the shaft portion thereof. The pressure adjusting screw 30 can be rotated from the outside of the upper housing 11a. Therefore, when the pressure adjusting screw 30 is rotationally operated, the spring receiving plate 26 moves up and down, and an initial value given to the diaphragm structure 25 is given. The pressure changes. Reference numeral 31 is a fixing screw of the pressure adjusting screw 30.

Therefore, when the pressure on the side of the secondary pressure outlet 13 is lower than the constant value set by the pressure adjusting screw 30, the pressure adjusting valve having the above-described structure is driven by the force of the compression spring 27 to cause the diaphragm structure 25 to move. The main valve 17 is lowered, and the main valve 17 opens the communication passage 16. Therefore, the high pressure on the side of the primary pressure inlet 12 is exerted on the side of the secondary pressure outlet 13. On the other hand, when the pressure on the side of the secondary pressure outlet 13 exceeds a certain value set by the pressure adjusting screw 30, the diaphragm structure 25 and the main valve 17 rise against the force of the compression spring 27. Then, the conical valve portion 17a of the main valve 17 is seated on the valve seat 16a to close the communication passage 16. The valve closing direction biasing spring 20 ensures this valve closing operation. Therefore, the supply of high pressure from the primary pressure inlet 12 to the secondary pressure outlet 13 is stopped. As a result of the above operation being repeated according to the rise and fall of the pressure on the secondary pressure outlet 13 side, a substantially constant secondary pressure can be extracted on the secondary pressure outlet 13 side. Of course, the extraction secondary pressure is changed by rotating the pressure adjusting screw 30 to move the spring receiving plate 26 up and down, and adjusting the initial pressure applied to the diaphragm structure 25 by the compression spring 27.

According to the present invention, the urging spring 20 for urging the main valve 17 in the valve closing direction has an atmosphere separated from the primary pressure inlet 12 and the secondary pressure outlet 13 by the diaphragm 23. Since it is arranged in the open chamber 19, even if the fluid flowing through the primary pressure inlet 12 and the secondary pressure outlet 13 is corrosive, there is no possibility of being corroded. Therefore, a stable pressure regulating function can be obtained for a long period of time.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the main valve 17A and the diaphragm structure 25A are not integrally coupled to each other, but both are relatively movable, and the main valve 17A is urged to move to the diaphragm structure 25A side so that the diaphragm structure 25A is moved. This is a supported example. The diaphragm 23A has a bellows portion 23b at the center thereof, and the coupling head portion 17c formed on the main valve 17A is inserted and supported in the bellows portion 23b. The joint head 17c and the diaphragm structure 25 are not joined. The bellows portion 23b has an elastic contracting force, and by the elastic contracting force, the main valve 17 is provided with a moving biasing force toward the diaphragm structure 25 side, and the coupling head 17c is always connected to the diaphragm structure 25. Abutting against. The other structure is the same as that of the embodiment of FIG. 1, and the same portions are denoted by the same reference numerals.

The basic operation of this embodiment is equivalent to that of the first embodiment. Further, according to this embodiment, it is possible to obtain a buffering action when the pressure on the secondary pressure outlet 13 side suddenly rises for some reason. That is, when the pressure on the secondary pressure outlet 13 side suddenly rises, the diaphragm structure 25A rapidly rises in response to the pressure rise. However, since the main valve 17A is elastically suspended and supported by the diaphragm structure 25A via the bellows portion 23b of the diaphragm 23, even if the diaphragm structure 25A suddenly rises, the main valve 17A does not The movement is not transmitted directly. That is, since the bellows portion 23b extends, it is possible to prevent the conical valve portion 17a from impactingly colliding with the valve seat 16a.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, the biasing force of the main valve 17B toward the diaphragm structure 25B is increased. In the embodiment of FIG. 2, the approaching biasing force of the main valve 17A with respect to the diaphragm structure 25A is solely due to the elasticity of the bellows portion 23b of the diaphragm 23. On the other hand, in this embodiment, another approach biasing spring 32 is further provided. That is, a through hole 24b is formed in the back plate 24B of the diaphragm structure 25B, and the spring receiving rod 17d connected to the connecting head portion 17c of the main valve 17B is inserted into the through hole 24b. There is. An approach urging spring 32 is inserted between the spring receiving flange 17e of the spring receiving rod 17d and the back plate 24B to further urge the main valve 17B to move toward the diaphragm structure 25B. The other parts are the same as in the embodiment of FIG.

Therefore, according to this embodiment, the main valve 17B can always be more reliably integrated with the diaphragm structure 25B. Further, the main valve 17B can be elastically displaced with respect to the diaphragm structure 25B only when an impulsive pressure increase of a certain value or more occurs on the secondary pressure outlet 13 side.

[0020]

[Effect of device]

 As described above, in the pressure regulating valve of the present invention, the spring means of the main valve, which has conventionally been the most problematic in corrosion resistance, is arranged outside the flow passage, so the fluid flowing in the flow passage is Even if it is corrosive, there is no possibility that the spring means will be corroded, and there is no possibility that particles will be generated or liquid will be accumulated. According to the third aspect, even when the secondary pressure suddenly rises, the main valve does not shockly close the flow passage, and the shock resistance can be secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of a pressure regulating valve according to the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the pressure regulating valve according to the present invention.

FIG. 3 is a vertical sectional view showing a third embodiment of the pressure regulating valve according to the present invention.

[Explanation of symbols]

 11 Housing 12 Primary Pressure Inlet 13 Secondary Pressure Outlet 16 Communication Passage 17 Main Valve 19 Atmosphere Opening Chamber 20 Valve Closing Direction Energizing Spring 23 23A Diaphragm 23b Bellows 24 Back Plate 25 25A 25B Diaphragm Structure 32 Approach Energizing Spring

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Takashi Ejiri 3-13-16 Nakano, Nakano-ku, Tokyo

Claims (3)

[Scope of utility model registration request] 1. A primary pressure inlet; a secondary pressure outlet;
A main valve for opening and closing a communication passage between the primary pressure inlet and the secondary pressure outlet; spring means for urging the main valve in a valve closing direction; moving according to the pressure of the secondary pressure outlet A diaphragm structure that includes a diaphragm and opens the main valve against the spring means when the pressure of the secondary pressure outlet falls below a set pressure; and the main valve is the diaphragm. The spring means, which is supported by the assembly and biases the main valve in the valve closing direction, is arranged on the back surface of the diaphragm that is not in communication with the primary pressure inlet and the secondary pressure outlet. Pressure regulating valve. 2. The pressure regulating valve according to claim 1, wherein the main valve is coupled to move integrally with the diaphragm assembly. 3. The pressure regulating valve according to claim 1, wherein the main valve is movably supported by the diaphragm assembly and is urged to move toward the diaphragm assembly.