JPH1182779A - Forced driving device for operating valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus which works a operating valve worked by the pressure of a fluid even in the position where no pressure of a fluid exists and is attached to the switch valve at the time when the apparatus is needed by installing a manual operation mechanism which moves a valve rod against a spring means in a switch valve independently of the fluid driving means. SOLUTION: In order to manually carry out valve opening operation even in a position where no pilot pressure source exists, a female screw hole 41 is formed while being communicated with the end part of the passage 33a in the axial direction of the outer end part of a valve rod 27 and a nut housing seat 43 having a rotation-stopping hole 42 is formed in the outer circumferential face of an upper housing 21b in the periphery of the pilot pressure introducing port 34. A manual operation unit 50 is installed in the female screw hole 41 and the nut housing seat 43 in freely detachable manner. The manual operation unit 50 comprises a nut housing 51 which can be detached from the nut housing seat 43, rotary operational body 52 fitted in the axial part by screwing screws 51a, 52a, and a connecting rod 53 inserted into the axial part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-off valve operated by fluid pressure, and more particularly to a forced drive device operated when fluid pressure cannot be obtained.

[0002]

2. Description of the Related Art In an on-off valve operated by fluid pressure, a valve body is urged in a closing direction or an opening direction by a spring force. When the fluid pressure overcomes the spring force, the valve body is opened or closed. Operates in the closing direction. Such an on-off valve,
Naturally, it could not be operated in places where fluid pressure was not available.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a forcible drive device for an on-off valve which can be operated even in a place where fluid pressure cannot be obtained, that is, it can be opened if it is a normally closed type and closed if it is a normally open type. Aim. Another object of the present invention is to provide a forced drive device that can be mounted on an on-off valve only when necessary.

[0004]

SUMMARY OF THE INVENTION The present invention provides a valve rod for actuating a valve element which opens and closes a flow path by coming into contact with and separating from a valve seat; spring means for urging the valve rod in a direction in which the valve element closes or opens the flow path; A fluid driving means utilizing fluid pressure for moving the valve rod against the spring means; a manual operation for moving the valve rod against the spring means independently of the fluid driving means. A mechanism.

The fluid drive mechanism includes, for example, a piston body integrated with a valve rod; a housing in which the piston body is slidably fitted; a pressure chamber defined by the piston body and the housing; A working fluid supply means for guiding a working fluid;
A connecting rod that is coaxially screwed with the valve rod and protrudes from the housing in a screwed state; a rotary operating body that supports the connecting rod so as to be freely rotatable relative to each other and to move together in the axial direction; A nut housing provided on the housing by screwing the operating body and coaxially restricting rotation with the connecting rod on the housing. It is preferable that the connecting rod, the rotary operation body, and the nut housing be detachable from the piston body and the housing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, the present invention is applied to a normally closed type booster on / off valve. First, the overall structure of the booster on-off valve will be described with reference to FIGS. The flow path block 11 has a pair of flow path connection ports 1 on the same axis.
2, 13 and an on-off valve connection port 14 orthogonal to the axis of the pair of flow path connection ports. Channel connection port 1
The flow paths 12a and 13a in the pipes 2 and 13 are
The annular valve seat 15 is opened at the open end of the flow path 12a.
Is provided. The on-off valve connection port 14 has an annular valve seat 1
A disk-shaped metal diaphragm 16 that covers the opening 5 and the opening end of the flow path 13a, a retainer 17 that presses the peripheral edge thereof, and an on-off valve body 18 that is movably supported in the retainer 17
And are provided. In this example, the flow path 12 a is on the supply side of the high-pressure fluid, and the annular valve seat 15 is located at the center of the metal diaphragm 16. The on-off valve element 18 comes into contact with and separates from the center of the metal diaphragm 16 and is pressed against the annular valve seat 15 by a force that overcomes the pressure of the fluid in the flow path 12a. cut off.

The lower housing 21a of the booster on / off valve 20 is screwed to the on / off valve connection port 14. The housing 21 includes the lower housing 21a and an upper housing 21b connected to the lower housing 21a by a lock ring 21c.

In the housing 21, as a movable member,
3 and 4, a valve shaft assembly 24, a pair of floating roller members 25, and an operating member 26 are inserted and supported in this order from the bottom. The valve shaft assembly 24 includes a valve shaft 22 that moves the on-off valve body 18 in a direction that comes into and away from the annular valve seat 15,
And a pair of valve shaft roller members 23. Each of the pair of valve shaft roller members 23 includes an outer peripheral roller 23a and a shaft member 23.
b, and the shaft member 23b is supported by a support plate 22a that is integral with and orthogonal to the valve shaft 22. The pair of valve shaft roller members 23 (shaft members 23 b) are arranged in a rotationally symmetric position with respect to the axis of the valve shaft 22 and in parallel with each other in a positional relationship orthogonal to the axis of the valve shaft 22 without intersecting with the axis of the valve shaft 22.

The operating member 26 integrally has a valve rod 27 coaxial with the valve shaft 22 and a piston body 29 integrally connected to an intermediate portion of the valve rod 27. The piston body 29 is airtightly slidably fitted in the housing 21 (the upper half cylinder of the lower housing 21a).
A valve-opening pressure chamber 31 is formed between the fixed partition wall 30 and the fixed partition wall 30. 3 is restricted by the lower end stopper surface 32 of the upper housing 21b. A pilot pressure source is connected to the valve opening pressure chamber 31 via an axial passage 33 a and a radial passage 33 b formed in the valve rod 27, a pilot pressure introduction port (female screw) 34 of the upper housing 21 b, and an opening / closing control valve 35. (Compressed air source) 36 pilot pressure P is exerted.

[0010] Piston body 29 and upper housing 21b
The compression spring 37 is inserted between the
6 is constantly biased toward the valve shaft assembly 24 side.
A tapered surface portion 27a is formed at the distal end of the valve rod 27 of the operating member 26, and between the tapered surface portion 27a and the valve shaft roller member 23 of the valve shaft assembly 24.
The pair of floating roller members 25 are inserted. The tapered surface portion 27a can be formed of a conical tapered shaft portion 27a1 as shown in FIG. 5 or a wedge surface 27a2 having a flat surface as shown in FIG.

Each floating roller member 25 has an outer peripheral roller 25.
a and a shaft member 25b, the outer peripheral roller 25a is housed in the recess 30a on the lower surface of the fixed partition 30 so as not to move in the axial direction, and the shaft member 25b moves to the lower surface guide wall 30b of the fixed partition 30. Guided freely. The pair of floating roller members 25 are parallel to the valve shaft roller member 23, and are located between the tapered surface portion 27 a of the valve rod 27 and the pair of valve shaft roller members 23. Actuating member 2
6, the valve closing pressure acting on the valve shaft 22 through the tapered surface portion 27a, the floating roller member 25, and the valve shaft roller member 23.
Is transmitted to

The taper of the tapered surface portion 27a of the valve rod 27, the outer diameter of the floating roller member 25 and the valve shaft roller member 23, and the initial position (the position when the on-off valve body 18 is separated from the annular valve seat 15) are as follows. It is determined as follows. That is, when the operating member 26 moves toward the valve shaft assembly 24 and the valve shaft 22 moves toward the annular valve seat 15 via the tapered surface portion 27a, the idle roller member 25, and the valve shaft roller member 23, the operating member 26 Valve shaft 2 for the unit travel of
These are set so that 2 moves by a movement amount smaller than the unit movement amount. For example, the moving amount of the operating member 26: the moving amount of the valve shaft 22 = 1: 0.2 or 1:
Determined as 0.1. In any operation state, the tapered surface portion 27a, the floating roller member 25, and the valve shaft roller member 23 maintain the contact state, and even when the operating member 26 moves to the valve shaft assembly 24 side at the maximum, the floating roller member The shaft position 25 does not move outside the shaft position of the valve shaft roller member 23. Reference numeral 24a is a weak compression spring that urges the valve shaft assembly 24 toward the valve opening side.

Therefore, in the booster on / off valve having the above-described structure, when the pilot pressure is not introduced into the valve-opening pressure chamber 31, the operating member 26 is moved by the force of the compression spring 37 to the valve shaft assembly 24.
Move to the side. This moving force (valve closing force) is transmitted to the valve shaft 22 via the tapered surface portion 27a of the valve rod 27, the floating roller member 25, and the valve shaft roller member 23, and the valve shaft 2
2 moves the on-off valve body 18 to the annular valve seat 15 side, and FIG.
The communication between the flow paths 12a and 13a is cut off via the metal diaphragm 16 as shown in FIG.

Looking at the transmission path of this force, the tapered surface 2
7a, when the valve closing force of the operating member 26 is transmitted to the valve shaft 22 via the floating roller member 25 and the valve shaft roller member 23, the valve shaft 22 is moved by a moving amount smaller than the unit moving amount of the operating member 26. Because of the movement, a large valve closing force can be obtained with a small compression spring 37 force. In the above example, a valve closing force 5 times or 10 times the force of the compression spring 37 is obtained.

When the valve is opened, the open / close control valve 35 is opened, and the pilot pressure of the pilot pressure source 36 is applied to the axial passage 33a and the radial passage 33b of the valve rod 27.
Through the valve opening pressure chamber 31. When the pilot pressure overcomes the force of the compression spring 37, the operating member 26 rises and the force for holding the on-off valve body 18 in the closed position disappears, and as a result,
The metal diaphragm 16 is deformed by the pressure in the flow path 12a, and the flow paths 12a and 13a communicate (FIG. 4).

The above opening / closing operation (valve opening operation) is performed by the pilot pressure introduction port (female screw) 3 of the upper housing 21b.
This is possible only when the pilot pressure source 36 is connected to 4, and the valve opening operation cannot be performed in a place where the pilot pressure source 36 does not exist.

The present invention has the following configuration in order to enable a manual valve opening operation even in a place where the pilot pressure source 36 does not exist. At the outer end of the valve rod 27, a female screw hole 41 is formed so as to communicate with the end of the axial passage 33a, and on the outer surface of the upper housing 21b, the outer periphery of a pilot pressure introduction port (female screw) 34 is formed. In position, a nut housing seat 43 having a detent hole 42 is formed.

The female screw hole 41 and the nut housing seat 4
3, the manual operation unit 50 shown in FIGS. 1 and 2 is detachable. The manual operation unit 50 includes a nut housing 51 that can be attached to and detached from the nut housing seat 43, a rotary operation body 52 screwed to a shaft of the nut housing 51 with screws 51 a, 52 a, and a shaft of the rotation operation body 52. And a connecting rod 53 slidably inserted into the connecting rod 53. A locking pin 54 that can be inserted into and removed from the locking hole 42 integrally or detachably with the nut housing 51.
Is provided at the protruding end of the connecting rod 53 from the rotary operation body 52.
A head 55 is formed to regulate the relative movement of the rotary operation body 52 and the rotary operation body 52 in the axial direction. Connecting rod 53
Has a male screw 5 which can be screwed into the female screw hole 41 at its tip.
6 is provided. The detent pin 54 may be provided in advance integrally with the upper housing 21b.

When the valve is manually opened in a place where the pilot pressure source 36 does not exist, the detent pin 54 is fitted into the detent hole 42 of the upper housing 21b, and the nut housing 51 is seated on the nut housing seat 43. The rotation operating body 52 is fully screwed into the nut housing 51, and the male screw 56 of the connecting rod 53 is screwed into the female screw hole 41 of the valve rod 27.

From this set state, the nut housing 5
When the rotary operation body 52 is rotated in a direction protruding from the nut housing 51 while holding the first operation member 1 so as not to be separated from the nut housing seat 43, the relative rotation with the rotation operation body 52 is free and the rotation operation is performed by the head 55. The connecting rod 53 that moves together with the body 52 in the axial direction is pulled out together with the rotary operation body 52. For this reason, the compression spring 3
7, the actuating member 26, ie the piston body 29
Is raised. FIG. 2 shows a state in which the piston body 29 is pulled up most against the force of the compression spring 37, and this state is the same as the valve-opened state by the pilot pressure in FIG. Therefore, the valve can be manually opened. Of course, the valve opening can be adjusted between the state shown in FIG. 1 and the state shown in FIG. 2 according to the amount of rotation operation of the rotary operation body 52.

Since the manual operation unit 50 is always separate from the housing 21 (opening / closing valve), the opening / closing valve itself does not increase in size. 41, detent hole 42 (or projection) of upper housing 21b, and nut housing seat 4
3, the configuration of the on-off valve itself does not become complicated.

In the above embodiment, the amount of movement of the valve shaft 22 (valve shaft assembly 24) that actually opens and closes the flow path is
Although the present invention is applied to a booster on-off valve in which the amount of movement of the valve rod 27 (piston body 29) is much larger, it is needless to say that a direct connection type in which the valve shaft 22 and the valve rod 27 are integrally connected. The present invention is applicable. Further, the present invention can be applied not only to a normally-closed on-off valve that obtains a valve closing pressure by a spring pressure as in the illustrated embodiment, but also to a normally-opening on-off valve that obtains a valve closing pressure by a pilot pressure.

[0023]

According to the present invention, an on-off valve operated by fluid pressure can be operated even in a place where no fluid pressure exists. Further, since the valve can be mounted on the on-off valve only when necessary, the on-off valve itself does not increase in size.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a valve closing state showing a mounted state of an on-off valve according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the valve opening state.

FIG. 3 is a longitudinal sectional view of the booster on-off valve in a closed state before the forced drive device according to the present invention is mounted.

FIG. 4 is a vertical cross-sectional view of the valve opening state.

FIG. 5 is a perspective view showing a relationship between a tapered surface portion, a floating roller member, and a valve shaft floating member of the booster on / off valve shown in FIGS. 1 to 4;

FIG. 6 is a perspective view similar to FIG. 3, showing another example of the shape of the tapered surface portion of the booster on / off valve shown in FIGS. 1 to 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Flow path block 15 Annular valve seat 16 Metal diaphragm 18 On-off valve body 20 Boosting on-off valve 21 Housing (cylinder) 22 Valve shaft 23 Valve shaft roller member 24 Valve shaft assembly 25 Floating roller member 26 Operating member 27 Valve rod 27a2 Wedge surface 29 Piston body 30 Fixed partition 31 Valve opening pressure chamber 32 Stopper surface 33a Axial passage 33b Radial passage 34 Pilot pressure introduction port (female screw) 35 Opening / closing control valve 36 Pilot pressure source 37 Compression spring (biasing means) 38 Atmospheric release chamber 41 Female thread hole 42 Detent hole 43 Nut housing seat 50 Manual operation unit 51 Nut housing 52 Rotating operation body 51a 52a Screw 53 Connecting rod 54 Detent pin 55 Head 56 Male screw

Claims (3)

[Claims] 1. A valve rod for operating a valve element which opens and closes a flow path by coming into contact with and separating from a valve seat; spring means for urging the valve rod in a direction in which the valve element closes or opens the flow path; and this spring means A fluid driving means using a fluid pressure for moving a valve rod against the valve; a manual operation mechanism for moving the valve rod against a spring means independently of the fluid driving means. A forced drive device for the on-off valve. 2. A forcible drive device for an on-off valve according to claim 1, wherein the fluid drive mechanism includes a piston body integrated with the valve rod; a housing in which the piston body is slidably fitted; A pressure chamber defined by the housing; and a working fluid supply means for guiding a working fluid to the pressure chamber. The manual operating mechanism is coaxially screwed to the valve rod and protrudes from the housing in a screwed state. A rotating operation body supporting the connecting rod so as to be freely rotatable relative to each other and moving together in the axial direction; and screwing the rotating operation body to restrict rotation on the housing coaxially with the connecting rod. A forcible drive of an on-off valve comprising: a provided nut housing; 3. The forcible drive device for an on-off valve according to claim 2, wherein the connecting rod, the rotary operation body, and the nut housing are detachable from the piston body and the housing.