JP2588038Y2 - Pressure regulating valve - Google Patents

Description

[Detailed description of the invention]

[0001]

TECHNICAL FIELD The present invention relates to a pressure regulating valve.

[0002]

2. Description of the Related Art A pressure regulating valve is a valve that changes a secondary pressure of an outlet according to a set pressure, and basically opens and closes a communication passage between a primary pressure inlet and a secondary pressure outlet. The main valve is normally urged in the valve closing direction by a spring means, and when the pressure at the secondary pressure outlet falls below a set pressure, the main valve is opened against the spring means. A diaphragm structure is provided. 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 drops, the pressure of the primary pressure inlet is applied to the secondary pressure outlet to make the secondary side. When the pressure on the secondary side is high, on the other hand, when the pressure on the secondary side is high, the communication path is closed by the main valve urged in the valve closing direction by the spring means, and the high pressure on the primary pressure side is introduced to the secondary side. prevent.

Although this pressure control valve is used for various purposes, it has been found that the following problems occur when used for controlling corrosive fluids. That is, the spring means for urging the main valve in the valve closing direction has to be arranged in the flow passage in the conventional structure. However, since the conventional spring means is made of a metal material, it is corroded by corrosive fluid over a long period of use, and as a result, the main valve closing force is weakened.
Alternatively, the valve closing force may be lost. When the valve closing force weakens or disappears, the function as a pressure regulating valve is impaired.

[0004]

SUMMARY OF THE INVENTION The present invention is based on the above awareness of the problem with the conventional pressure regulating valve, and the spring means for biasing the main valve in the valve closing direction is not corroded, and therefore the pressure regulating action changes with time. It is an object to obtain a pressure regulating valve with less pressure. Another object of the present invention is to provide a pressure regulating valve which has a small number of parts and is easy to assemble.

[0005]

SUMMARY OF THE INVENTION The present invention is based on the idea that the spring means, which has conventionally been made of a metal material, is made of a material which does not corrode and has a necessary spring property. As a result of the study, they found that the fluororesin material was the most appropriate, and it was completed.

That is, the present invention provides 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, and closing the main valve in a valve closing direction. A diaphragm for biasing; a diaphragm which moves in accordance with the pressure of the secondary pressure outlet, and a diaphragm which opens the main valve against the spring means when the pressure of the secondary pressure outlet falls below a set pressure. A pressure regulating valve comprising a main body and a spring means, and the main valve and the spring means are made of a fluorine resin. As the fluororesin, specifically, for example, an ethylene tetrafluoride resin can be used.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 shows a first embodiment of the present invention. The housing 11 includes an upper housing 11a, an intermediate housing 1
1b and a lower housing 11c, which are connected by a fastening screw 18. In the intermediate housing 11b, a primary pressure inlet 12 and a secondary pressure outlet 13 are open, and a communication path 16 is formed between the primary pressure inlet 12 and the secondary pressure outlet 13.

The main passage 17 opens and closes the communication passage 16. The lower end of the communication passage 16 is formed by a tapered valve portion 17 of the main valve 17.
a constitutes a valve seat 16a to be brought into contact with and separated from the valve seat 16a.

The main valve 17 comprises a main valve integrated spring 31 formed integrally with a tetrafluoroethylene spring 20. FIG. 2 shows a unitary shape of the main valve integrated spring 31. The main valve 17 and the valve closing biasing spring 20 are integrally formed from a fluororesin to form the main valve integrated spring 31. The valve closing direction biasing spring 20 is composed of a simple cylindrical body 20a having no bottom portion, and the cylindrical spiral body 20a
0b is formed. A spring seat plate 21 of a spring 20 made of tetrafluoroethylene is sandwiched between the intermediate housing 11b and the lower housing 11c.

Upper housing 11a and intermediate housing 11
A peripheral bead portion 23a of the diaphragm 23 is sandwiched between b. On the upper surface of the diaphragm 23, a back plate 24 is located.
3 and the back plate 24 constitute a diaphragm structure 25. The pressure of the secondary pressure outlet 13 is applied to the lower surface of the diaphragm 23 of the diaphragm structure 25.

A compression spring 27 is inserted between the diaphragm structure 25 and a spring receiving plate 26 in the upper housing 11a, and presses the diaphragm structure 25 downward. When the diaphragm structure 25 is displaced downward by the force of the compression spring 27, the main valve 17
And the tapered valve portion 17a of the main valve 17 is separated from the valve seat 16a against the force of the spring 20 made of ethylene tetrafluoride. 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 is displaced upward and separates from the main valve 17. Then, by the force of the spring 20 made of tetrafluoroethylene, the taper valve portion 1 of the main valve 17 is moved.
7a is seated on the valve seat 16a.

The spring receiving plate 26 has a guide projection 29, which is fitted in a straight guide groove 28 formed in the upper housing 11a. Therefore, the spring receiving plate 26 is capable of moving straight toward the diaphragm structure 25, and the male screw portion 30a of the pressure adjusting screw 30 is screwed to the shaft portion. The pressure adjusting screw 30 is rotatable from outside the upper housing 11a. Therefore, when the pressure adjusting screw 30 is rotated, the spring receiving plate 26 moves up and down, and the initial pressure applied to the diaphragm structure 25 is increased. Changes. 31 is a fixing screw of the pressure adjusting screw 30.

Accordingly, when the pressure on the side of the secondary pressure outlet 13 is lower than a fixed value set by the pressure adjusting screw 30, the pressure regulating valve having the above-described structure is operated by the force of the compression spring 27 to form the diaphragm structure 25. Is lowered, the main valve 17 is lowered against the spring 20 made of tetrafluoroethylene, and the communication passage 16 is opened. Therefore, the high pressure on the primary pressure inlet 12 side is exerted on the secondary pressure outlet 13 side. 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 rises against the force of the compression spring 27. Then, as the diaphragm structure 25 is raised, the main valve 17 is also raised by the force of the spring 20 made of tetrafluoroethylene, and the tapered valve portion 17a is seated on the valve seat 16a to close the communication passage 16.
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,
An almost constant secondary pressure can be extracted from the secondary pressure outlet 13 side. Of course, the extraction secondary pressure is
To move the spring receiving plate 26 up and down,
It changes by adjusting the initial pressure applied to the diaphragm structure 25 by the compression spring 27.

According to the present invention, the main valve 17 and the main valve biasing spring 20 provided in the flow passage from the primary pressure inlet 12 to the secondary pressure outlet 13 are made of a fluororesin. Since the fluid is corrosive, it is not corroded by the integral spring 31, so that a stable pressure regulation function can be obtained over a long period of time. Further, according to the main valve integrated spring 31, since the main valve 17 and the urging spring 20 are integrated in advance, the number of parts is reduced, and the urging is likely to fly around or be lost during assembly. Since the spring 20 is integral with the main valve 17, assembly is easy. Further, by constituting the main valve 17 from a fluororesin, the corrosion resistance of the main valve itself is also increased. In addition to the housing 11, only the diaphragm 23 is located in the flow path except the housing 11. Since the diaphragm 23 is known to have corrosion resistance, the overall corrosion resistance is improved. be able to.

[0015]

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 made of fluorine resin integrally with the main valve. Can be improved. Further, the number of parts can be reduced, the assemblability can be improved, and the corrosion resistance of the entire apparatus can be improved.

[Brief description of the drawings]

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

FIG. 2 is a front view in which a part of a tetrafluoroethylene main valve integrated spring of the pressure regulating valve of FIG. 1 is partially sectioned;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Housing 12 Primary pressure inlet 13 Secondary pressure outlet 16 Communication path 17 Main valve 20 Spring made of ethylene tetrafluoride 23 Diaphragm 25 Diaphragm structure 31 Spring integrated with main valve

Continuation of the front page (56) References Japanese Utility Model Showa 48-15617 (JP, U) Japanese Utility Model Showa 59-76771 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G05D 16 / 06

Claims (1)

(57) [Scope of request for utility model registration] A primary pressure inlet; a secondary pressure outlet; a main valve for opening and closing a communication path between the primary pressure inlet and the secondary pressure outlet; and biasing the main valve in a valve closing direction. A diaphragm that moves in accordance with the pressure of the secondary pressure outlet, and that opens a main valve against the spring means when the pressure of the secondary pressure outlet falls below a set pressure. A pressure regulating valve comprising: a main body integrally formed with the spring means; and the main valve and the spring means formed of a fluorine resin.