JP2801420B2 - On-off valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing valve having a novel structure operated by an air pilot pressure, and more particularly to an opening / closing valve capable of opening and closing a high-pressure fluid with a small air pilot pressure.

[0002]

2. Description of the Related Art An opening / closing valve operated by an air pilot pressure has a valve closing force or a valve opening force due to a spring pressure depending on the pressure of a fluid flowing through a fluid passage to be opened / closed.
An air pilot pressure must be set against this. For this reason, conventionally, the opening / closing valve has different specifications depending on the fluid pressure to be opened / closed, and the user has to select and use this. Various mechanisms for boosting the air pilot pressure are also known, but the conventional apparatus cannot easily change the boost ratio once set.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an on-off valve provided with a booster mechanism for an air pilot pressure different from that of a conventional device. In particular, an object of the present invention is to provide an opening / closing valve that can easily adjust a valve opening force or a valve closing force and an air pilot pressure against the force according to fluid pressure by increasing or decreasing the number of components. I do.

[0004]

SUMMARY OF THE INVENTION The present invention has been completed by improving a cylinder mechanism for applying an operating force to a valve element for opening and closing a fluid passage, and comprises a piston, a biasing means for pressing the piston, and a resistance to the biasing means. The above object has been achieved by forming a cylinder mechanism having a pressure chamber for moving a piston as a unit into a laminated structure and selecting the number of laminated layers.

[0005] In the opening and closing valve of the present invention, a base cylinder body, at least one intermediate cylinder body and a lid cylinder body which are separable from each other are sequentially laminated on a valve body having a valve body for opening and closing a fluid passage, At least two split piston bodies which are separable from each other and are in axial contact with each other are fitted into these base cylinder body, intermediate cylinder body or lid cylinder body, and these split piston bodies and inner cylinders formed in the base cylinder body are fitted. A biasing means is inserted between each of the flange portion, the intermediate cylinder body and the lid cylinder, and a valve closing force or a valve opening force is applied to the valve body via the divided piston body. And a pressure chamber for applying an air pilot pressure in a direction against the urging means.

[0006] The intermediate cylinder body and the split piston body are
By preparing a plurality of substantially the same shape, by setting the number of lamination according to the fluid pressure flowing through the fluid passage,
Different fluid pressures can be easily accommodated. When the pressure chamber is formed between the divided piston body and the inner flange portion, the base cylinder body, or the lid cylinder body of the intermediate cylinder body, a laminated cylinder type valve having a simple structure can be obtained.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
1 and 2 show an embodiment in which the present invention is applied to a normally closed (NC, normally closed) type high pressure valve. The valve body 11 has a fluid inlet passage 12, an outlet passage 13, and a connection passage 14 connecting the inlet passage 12 and the outlet passage 13. The upper end of the connection flow path 14 in FIG. 1 is a valve seat 15, and the valve element 16 is moved toward and away from the valve seat 15. The valve body 16 is urged in the valve opening direction by a weak compression spring 17. The upper end of the valve body 16 in FIG. 1 is in contact with the metal diaphragm 18. Metal diaphragm 18
Closes the valve chamber 19 communicating with the inlet passage 12, the outlet passage 13 and the connection passage 14.

On the valve body 11, a base cylinder body 22 is inserted through a connector 21 toward the axial direction of the valve body 16.
In this embodiment, three intermediate cylinders 23 are superimposed on the base cylinder 22, and a lid cylinder 24 is further superimposed on the uppermost intermediate cylinder 23. The base cylinder body 22, the intermediate cylinder body 23, and the lid cylinder body 24 are joined together by joining bolts 25 at four corners to be integrated. The intermediate cylinder body 23 integrally has a peripheral cylinder portion 23a and an inner flange portion 23b.

In this embodiment, four divided piston bodies 27, which are separable from each other, are inserted into a cylinder body composed of the base cylinder body 22, the intermediate cylinder body 23 and the lid cylinder body 24. . The split piston body 27 includes a shaft portion 27a that contacts each other, and the shaft portion 27a.
And a piston portion 27b extending in the radial direction from the base portion and contacting the base cylinder body 22 or the intermediate cylinder body 23. Piston portion 27b of lowermost split piston body 27
Are the base cylinder body 22 and the lowermost intermediate cylinder body 23
The piston portion 27b of the intermediate split piston body 27 extends between the inner flange portions 23b of the upper and lower intermediate cylinder bodies 23, and extends between the inner flange portions 23b of the upper and lower intermediate cylinder bodies 23. 27b extends between the uppermost inner flange portion 23b and the lid cylinder body 24.

The shaft portion 27a of the split piston body 27 has a cylindrical portion 28 at the upper end in the figure and a shaft portion 29 at the lower end having a diameter that fits into the cylindrical portion 28. Contact in the direction. The cylindrical portion 28 is fitted to the inner diameter of the inner flange portion 23b, and the inner flange portion 23b, the piston portion 27
b, intermediate cylinder body 23 (or base cylinder body 22)
A pressure chamber 30 is defined by the cylindrical portion 28.

The piston portion 27b of each split piston body 27
A plurality of compression coil springs 31 are inserted between the inner cylinder 23 and the inner flange 23 b of the intermediate cylinder 23 or the lid cylinder 24. The compression coil spring 31 presses each divided piston body 27 downward, and the entire resultant force is exerted on the valve body 16 via the slider 32 that contacts the valve body 16 with the metal diaphragm 18 interposed therebetween. The resultant force of the compression coil spring 31 is sufficiently stronger than that of the compression spring 17, and therefore, the valve body 16 is always seated on the valve seat 15. The number of stacked intermediate cylinder bodies 23, that is, the number of divided piston bodies 27, is set according to the magnitude of the pressure of the fluid flowing through the inlet passage 12, the outlet passage 13, and the connection passage 14.

The uppermost split piston body 27 has a shaft 29
And the cover cylinder body 2 is provided in the shaft hole 27c.
Four shaft projections 24a are fitted. Air pilot introduction shaft holes 33 and 34 are formed in the shaft projection 24a and the shaft portion 29 of the divided piston body 27. Each divided piston body 27 is further provided with the air pilot introduction shaft hole 33.
Alternatively, a pilot pressure introduction passage 35 for communicating the pressure chamber 30 with each pressure chamber 30 is formed. 36 is an O-ring that keeps the pressure chamber 30 airtight, and 37 is a breeze hole that connects the room in which the compression coil spring 31 is inserted to the atmosphere.

Therefore, in the state where the air pilot pressure is not introduced from the air pilot introduction shaft hole 33 of the lid cylinder body 24, each of the divided piston bodies 27 is moved by the force of the compression coil spring 31. Pressed to the side,
The valve element 16 is seated on the valve seat 15 by the combined force of all the compression coil springs 31. Therefore, the channel is closed. On the other hand, the air pilot pressure P
Is supplied, air pilot pressure is introduced into each pressure chamber 30 via the coaxial hole 34. When this pilot pressure overcomes the force of the compression coil spring 31 and each of the divided piston bodies 27 rises, the valve closing force exerted on the valve body 16 is released, and as a result, the valve body 16 is connected to the inlet passage 12 and the connection flow passage. Due to the fluid pressure applied to 14 and the force of the compression spring 17, the valve 14 is separated from the valve seat 15 to open the flow path.

The characteristics of the on-off valve of the present invention are as follows.
Each split piston body 27 has a compression coil spring 31
And the air pilot pressure acting on the pressure chamber 30 acts. For this reason, the valve closing force of the compression coil spring 31 increases in accordance with the number of stacked piston bodies 27, while the air pilot pressure P required for opening the valve is increased.
It does not need to be large.

FIGS. 3 and 4 show the present invention in a normally open (NO, No.
This embodiment is applied to a (rmally Open) type high pressure valve, and the same components as those of the normally closed first embodiment of FIGS. 1 and 2 are denoted by the same reference numerals. In this embodiment, the same divided piston body 27 and intermediate cylinder body 23 as those of the first embodiment are used upside down, except for the uppermost divided piston body 27A. . The main difference between this embodiment and the first embodiment is that the compression coil spring 31A has the split piston bodies 27A and 27A.
7R is inserted between the divided piston body and the inner flange portion 23b of the intermediate cylinder body 23R or the base cylinder body 22A in order to move and urge the 7R upward.
At the point where the pressure chamber 30A is provided to raise the divided piston bodies 27A and 27R against the force of the compression coil spring 31A by the air pilot pressure introduced therein, at the upper part of the divided piston body 27A, The point that the pressure chamber 30A is formed by the lid cylinder body 24A and the shape of the compression coil spring 31B inserted between the lowermost divided piston body 27R and the base cylinder body 22A are different from the compression coil spring 31A. A different point.

According to this embodiment, when the air pilot pressure P is supplied to the air pilot introduction shaft hole 33A of the lid cylinder body 24A, this pressure is supplied through the air pilot introduction shaft hole 34 and the introduction passage 35 to the pressure chamber. 30A, and when this force overcomes the force of the compression coil spring 31A or 31B, the split piston bodies 27A and 27R descend. These split piston bodies 27A and 27R
Are in contact in the axial direction, and the resultant force of these descending forces causes the valve body 16 to receive the descending force via the slider 32A to sit on the valve seat 15 and close the flow path. In contrast,
When the supply of the air pilot pressure to the air pilot introduction shaft hole 33A is cut off, the divided piston bodies 27A and 27R rise by the force of the compression coil springs 31A and 31B, and the valve body 16 rises accordingly. , Open the flow path.

Also in this embodiment, the number of laminating stages of the intermediate cylinder body 23R and the divided piston body 27R is increased or decreased according to the magnitude of the fluid pressure flowing through the inlet passage 12, the outlet passage 13 and the connection passage 14. The flow path can be closed without changing the pilot pressure itself.

In the above embodiment, some of the divided piston bodies 2
The shape of 7 or 27A was made different from the others, but this was for the purpose of downsizing, and it is also possible to configure only the split piston body 27 of the same shape.
Further, in the above embodiment, the compression coil spring is used as the urging means. However, for example, a disc spring may be used instead.

[0019]

According to the on-off valve of the present invention, the air pilot pressure is applied to each of the divided piston bodies, and the opening force or the closing force is obtained by the resultant force of these divided piston bodies. High pressure fluid can be opened and closed. In particular, by increasing or decreasing the number of layers of the divided piston body and the intermediate cylinder body, there is an excellent feature that the size of the fluid pressure can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line BB of FIG. 2 showing an embodiment in which the present invention is applied to a normally closed high pressure valve.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line DD of FIG. 4 showing an embodiment in which the present invention is applied to a normally-open high-pressure valve.

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Valve body 12 Inlet passage 13 Outlet passage 14 Connection flow path 15 Valve seat 16 Valve body 17 Compression spring 18 Metal diaphragm 22 Base cylinder body 23 23R Intermediate cylinder body 23a Peripheral cylinder part 23b Inner flange part 24 24A Cover cylinder body 27 27R Split piston body 27a Shaft 27b Piston 30 30A Pressure chamber 31 31A 31B Compression coil spring 31 32 32 Laminated disc spring

Continuation of the front page (56) References JP-A-63-83477 (JP, A) JP-A-64-3387 (JP, A) JP-A-3-157577 (JP, A) JP-A-1-120991 (JP) , A) Actually open sho 64-55383 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 31/163 F15B 15/14

Claims (3)

(57) [Claims] 1. A valve body having a valve body for opening and closing a fluid passage; a base cylinder body, at least one intermediate cylinder body and a lid cylinder body, which are sequentially coupled on the valve body and which are separable from each other; At least two split piston bodies which are separable from each other and are in axial contact with each other and which are fitted on the base cylinder body, the intermediate cylinder body or the lid cylinder body; these split piston bodies and an inner flange formed on the base cylinder body A biasing means inserted between the portion, the intermediate cylinder body and the lid cylinder to apply a valve closing force or a valve opening force to the valve body via the divided piston body; and A pressure chamber for applying an air pilot pressure in a direction against the urging means; 2. The on-off valve according to claim 1, wherein a plurality of intermediate cylinder bodies and divided piston bodies having substantially the same shape are prepared, and the number of the stacked cylinder bodies is set according to the fluid pressure flowing through the fluid passage. 3. The on-off valve according to claim 1, wherein the pressure chamber is formed between the divided piston body and an inner flange portion, a base cylinder body, or a lid cylinder body of the intermediate cylinder body.