JPS61282674A - Valve-body supporting apparatus in ball valve - Google Patents

Abstract

PURPOSE:To facilitate the demounting of a valve body and replacement of a valve seat by pressurizing or decompressing the inside of a fluid chamber formed by a guide hole on a valve box and the outer peripheral surface of a retainer. CONSTITUTION:When the fluid pressure in a fluid chamber 21 increases and the force acting onto the inner edge surface 8a of a flange 8 increases a retainer 6 shifts outwardly against the springy force of a compressing spring 16. A valve seat 12 is separated from a valve body 17 by the shift. When the retainer 6 shifts outwardly over the depth of the inner-edge hole 11 of the retainer 6, a holding member 13 can be demounted from the hole 11. Assembly of the holding member 13 and the valve body 17 for the retainer 6 is facilitated by returning the fluid in the fluid chamber 12 into a pressurizing device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ball valve that has a ball-shaped valve body in a valve box that opens and closes a fluid flow path. The above-mentioned valve body holding device is particularly concerned with annular valve seats that support the valve body by being in pressure contact with symmetrical positions on the circumferential surface of the valve body, so that the annular valve seats can be retracted from the valve body using fluid pressure.

The present invention relates to a valve body holding device that allows the valve body to be easily attached to and removed from the valve body and the valve seat to be replaced.

[Conventional technology]

In the conventional general pol valve shown in Part 4, (51)
is the valve box, (52) is the fluid inlet/outlet, (53) is the valve box (
The assembly hole (54) provided at the upper center of the valve body (51) closes the assembly hole (53) and is secured to the valve body (5) by a bolt (55).
1) Valve i fixed to ! , (56) is a ball-shaped valve body, (57) is a valve rod that penetrates the valve cover (54) from above and whose lower end is fixed to the valve body (56), and (58) is an O-ring. (59) and the valve cover (
54) are shown, and the valve lever (54) is shown.
At the top of 7), there is a handle (not shown) with a key (62).
It is installed through. The shaft (60) provided at the bottom of the valve body (56) is.

It is pivotally attached to the lower part within the valve box (51).

A large diameter guide hole (63) coaxial with the entrance/exit (52) is formed at the inner end of each entrance/exit (52). An annular leaf spring (64) is inserted into the guide hole (63) from the outside.
and a cylindrical retainer (65) are fitted in this order.

As shown in FIG. 3, an annular holding member (67) having a valve seat (66) at its inner end is provided between the retainer (65) and the valve body (56). The valve seat (66) is a disc spring (
64) is in pressure contact with the spherical surface (56a) of the valve material (56). The outer surface (67a) of the holding member (67) and the guide hole (6
3) O-rings (6g) for seals that come into contact with each
(69) are provided respectively.

The above-mentioned ball valve has various guide holes (
63), fit the leaf spring (64) and retainer (65) in this order, and with the holding member (67) in contact with the valve body (56), attach the valve body (56) and the retaining member (67) to each other. The valve cover (54), in which the valve rod (57) is forcibly inserted between the retainers (65) and inserted therethrough, is assembled by attaching it to the valve box (5 steps).

Disassembly of the ball valve is performed by reversing the above procedure.

In addition, the above-mentioned ball valve has a valve box (51) and a valve cover (54).
If the pressure difference between the fluids at the inlet and outlet (52) is large, the valve seat (66) on the low pressure side
This will cause the pressure contact between the valve body (56) and the valve body (56) to become unstable.

The valve body (56) is supported by the valve seat (66), and the valve body (56)
can move slightly to the side.

When the valve seat (66) becomes worn and no longer functions properly due to long-term use of the ball valve, it is necessary to disassemble and assemble the ball valve and replace the valve seat (66) with a new one. be.

To remove the holding member (67) for this replacement, the valve cover (
54), and while keeping the first holding member (67) in contact with the valve body (56), remove the valve body (56) and the valve seat (66).
) is pulled out upwardly from both retainers (65).

Both retaining members (6) with replaced new valve seats (66)
5) and assembling the valve body (56) into the valve body (51).

Use an appropriate jig to widen the gap between the two retainers (65) and hold them, and then hold the two retainers (67) in contact with the valve body (56) at a predetermined position. - Insert between both retainers (65) together.

[Problem that the invention seeks to solve]

In the conventional ball valve, the single retainer (56) is always urged inward by the leaf spring (64), and the holding member (67) cannot be moved in or out between the retainers (65) when replacing the valve seat. , use an appropriate jig to attach the retainer (
65) must be displaced outward, which is troublesome and takes a long time.

Furthermore, when assembling the holding member (65), it is difficult to position both holding members (65) at appropriate locations on the valve body (56). One more car holding member (65)
When the retainer (67) is inserted, the outer surface of the holding member (67) slides against the inner surface of the retainer (65), which causes a problem in that the sealing O-ring (67) is damaged.

[Means for solving problems]

In the present invention, mounting holes are formed at key points on the side of the valve box to form holes at the inner ends of the fluid inlets and outlets facing each other in the valve box. A compression spring and a cylindrical retainer having an annular valve seat at the inner end and an outward flange at a suitable position on the outer periphery are fitted in order from the outside into a guide hole coaxial with the entrance and exit, and the valve seats facing each other are fitted in order from the outside. In the ball valve, the ball-shaped valve body is held between the valve body and the assembly hole is closed with the valve cover, and the inner end of the valve rod is engaged with the valve body. , an annular fluid chamber is formed by the outer circumferential surface of the retainer and the flange, and the retainer is displaced outwardly by pressurizing or depressurizing the fluid chamber through a flow path provided at an appropriate location in the valve box. The purpose of this study is to solve the above problems.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.

In FIG. 1, the flange (52a) is attached to the inner end of the fluid inlet/outlet (2) provided at a key point on the side of the valve box (1).
A guide hole (4) is formed through a flange (3) similar to the above. The outer peripheral surface (6a) of the cylindrical retainer (6) is loosely fitted into the annular guide member (5) screwed into the inward opening of the guide hole (4). It is sealed by an O-ring (7).

An outward flange (8) that loosely fits into the guide hole (4) is formed at a suitable location on the outer periphery of the retainer (6), and an O-ring (9) for sealing is provided on the outer periphery.

A holding member (13) having an inward valve seat (12) is loosely fitted into a hole (U) provided at the inner end of the retainer (6). (14) shows an O-ring embedded in the inner end surface of the retainer (6) 6 Inside the plurality of holes (15) provided in the outer end of the retainer (6), the inner end of the compression spring (16) is inserted and the compression spring (
The outer end of 15) is in pressure contact with the inner surface of the flange (3).

A retainer (6) and a valve seat (12) similar to those described above are also provided in a guide hole provided at a key point on the other side of the valve box (1). The valve body (17) is supported by bringing a pair of opposing valve seats (12), which are urged inwardly by a compression spring (16), into pressure contact with the spherical valve body (17). (18) is a valve cover that closes an assembly hole (19) provided in the upper center of the valve box (1).

Outer peripheral surface (6a) and flange (8) of retainer (6)
The inner end surface (8a) of the guide hole (4) and the guide member (
5), a fluid chamber (21) is formed. A screw hole (22) formed at a proper location in the valve box (1) communicates with the oil chamber (21) via a flow path (23).

A threaded portion (25) of an injector (24) shown in FIG. 3 is screwed into the threaded hole (22).

The injector (24) shown in FIG. 3 has a fluid chamber (21)
The upper part of the main body (26) which has a threaded part (25) at the lower part is used for supplying fluid into the interior of the body.
A flange-like engagement portion (27) is formed.

A stepped hole (28) with a large diameter at the top drilled in the main body (26)
A compression spring (29) and a ball (31) are inserted in this order. The ball (31) is pressed against the inner edge of the hole (32a) of a ring (32) fixed to the upper part of the main body (26).

A pressurizer (33) is attached to the upper part of the injector (24) for feeding fluid into the injector (26) with one operation. When the fluid is oil such as grease, a grease gun, for example, is used as the pressurizer (33).

The fluid pressure in the fluid chamber (21) increases and the flange (8
) increases the force acting on the inner end surface (8a).

The retainer (6) is displaced outwardly against the elasticity of the compression spring (16). This displacement causes the valve seat (12) to move away from the valve body (17).

When the retainer (6) is displaced outwardly beyond the depth of the hole (11) at the inner end of the retainer (6), the retaining member (13) can be removed from the hole (11).

When the retainer (6) is in the above displacement position, the pressurizer (
When the pressurizing action of 33) is stopped, the check action of the balls (31) prevents the fluid from returning to the pressurizer (33), and the retainer (6) is held at the above-mentioned displaced position.

When the retainer (6) is held in the outwardly displaced position as described above, the holding member (13) is removed from the retainer (6).
), and the valve body (17) and holding member can be easily removed from the valve box (1). This makes it easy to replace the valve seat (12) of the holding member (13) with a new one.

Note that the holding member (13) and the valve body (17) are assembled to the retainer (6) when the holding member (I3) is fitted into the hole (11) of the retainer (6), and then the fluid chamber (21) is assembled. ) can be easily carried out by returning the fluid in the pressurizer (35).

FIG. 2 shows a modification of the fluid chamber (38).

The outward facing flange (39) provided on the outer circumferential surface of the retainer (6) is formed at a position further inward than the inner opening of the flow path (23), contrary to the state shown in FIG. .

The fluid chamber (38) includes a guide hole (4a) into which the flange (39) loosely fits, a wall surface (41) on the outside thereof, and a retainer (
6) and the outer end surface (39a) of the flange (39), and the O-ring (42) (43
) is sealed.

A check valve device (44) that acts in the opposite direction to that of the injector (24) is provided in the threaded hole (22) that communicates with the flow path (23).
is installed.

By discharging the fluid in the fluid chamber (38) by an appropriate pressure reducing device connected to the check valve device (44), the pressure in the fluid chamber (15) is reduced, and the outer end surface (
39a) is sucked outward. This suction causes the retainer (6) to move and be displaced outwardly.

When the retainer (6) is displaced by the required amount, the holding member (13) and the valve body (17) can be easily removed and assembled from the retainer (6), as in the case of FIG. It can be carried out.

In addition, as the fluid supplied to and discharged from the fluid chambers (21) (38), gases such as air and nitrogen gas are used in addition to liquids such as general oil for hydraulic equipment, grease, and water.

〔Effect of the invention〕

Book a! According to Akira, a fluid chamber is formed by a guide hole of a valve box and an end face of an outward flange provided at a proper location on the outer periphery of a retainer and loosely fitted into the guide hole, and a flow path provided at a proper location of the valve box. By supplying and discharging fluid through the valve body to pressurize or depressurize the fluid chamber, the retainer is displaced and held outward from the valve body. The holding member to be mounted and the valve body held by this,
It can be easily removed from the valve box or assembled, and maintenance such as replacing the valve seat with respect to the holding member is easy.

[Brief explanation of drawings]

1 is a longitudinal cross-sectional view of the main part of a valve body support device in a ball valve showing one embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the present invention, and FIG. , a vertical cross-sectional view of an injector; FIG. 4 is a vertical cross-sectional view showing an example of a conventional ball valve;
5 is an enlarged vertical sectional view of the section (A) in FIG. 4.

Claims (3)

[Claims] (1) A compression spring is inserted from the outside into a guide hole coaxial with the inlet/outlet, which is drilled at the inner end of each of the fluid inlet/outlet facing each other in the valve box, from an assembly hole provided at a key point on the side of the valve box. and a cylindrical retainer having an annular valve seat at the inner end and an outward flange at a suitable position on the outer periphery,
A ball valve in which a ball-shaped valve body is held between mutually opposing valve seats, the assembly hole is closed with a valve cover, and the inner end of a valve rod is engaged with the valve body, comprising: An annular fluid chamber is formed by the guide hole of the box, the outer circumferential surface of the retainer, and the flange, and by pressurizing or depressurizing the fluid chamber through a flow path provided at an appropriate location in the valve box, the retainer is moved to the outside. 1. A valve body support device for a ball valve, characterized in that the valve body support device is adapted to be displaced in the direction. (2) Claim (1) characterized in that the flange of the retainer is formed outwardly from the opening of the flow path, and the retainer is displaced outwardly by pressurizing the inside of the fluid chamber. A valve body support device in a ball valve according to. (3) Claim (1) characterized in that the flange of the retainer is formed inwardly from the opening of the flow path, and the retainer is displaced outwardly by reducing the pressure in the fluid chamber. Valve body support device in the ball valve described in 2.