JPS6250713B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to ball valves, and more particularly to a seat between the ball and seat of a ball valve.

In conventional ball valves, the method of bringing the seat into contact with the ball is to install an adjustment screw that receives the seat, and by tightening the adjustment screw with a certain torque, a predetermined surface pressure is applied between the ball and the seat to hold the seat. Was.

For example, in a large ball valve, if the diameter of the flow path formed in the ball is about 500 mm or more, it becomes difficult to operate the adjustment screw when installing or removing the ball, and the part of the seat that comes into contact with the ball becomes difficult. Since the diameter of the adjustment screw becomes large, a large torque is required to turn the adjustment screw in order to apply a predetermined contact pressure, which poses a problem in terms of workability.

The present invention aims to solve the above problems.

The present invention solves the above object by creating a ball valve with a structure in which the seat is pressed against the ball by fluid pressure such as water pressure or oil pressure, using an adjustment ring that is pressed by hydraulic pressure in the part corresponding to the conventional adjustment screw. did.

The details of the present invention will be explained with reference to embodiments shown in the figures.

In FIG. 1, inside a main body 3 having an inlet 1 and an outlet 2, a first guide surface 4 having a cylindrical inner wall surface communicating with the inlet 1 and a cylindrical inner wall surface communicating with the outlet 2 are provided. The second guide surface 5 is formed concentrically opposite to the second guide surface 5 . A first sliding surface 6 having a cylindrical inner wall surface having a diameter larger than that of the first guide surface 4 continues to the first guide surface 4 via a stepped wall portion 7 . The first sliding surface 6 is formed concentrically with the first guide surface 4. Similarly, on the second guide surface 5, a second sliding surface 8 having a cylindrical inner wall surface having a larger diameter than the second guide surface 5 that is formed concentrically has a stepped wall portion 9.
continues through. A first adjustment ring 10 is fitted into the first guide surface 4 , and a second adjustment ring 11 is fitted into the second guide surface 5 .

The first adjustment ring 10 and the second adjustment ring 1
The first adjustment ring 10 has an inner ring portion 10a that slides on the first guide surface 4, an outer ring portion 10b that slides on the first sliding surface 6, and an inner ring 10. It has a disk portion 10c that connects the ring portion 10a and the outer ring portion 10b. Similarly, the second adjustment ring 11 is
1a, an outer ring portion 11a, and a disk portion 11c, the inner ring portion 11a slides on the second guide surface 5, and the outer ring portion 11b slides on the second sliding surface 8. Each inner ring part 10a, 11a and outer ring part 1
Seal rings 12 and 13 are attached to 0b and 11b, respectively, to seal between the guide surfaces 4 and 5 and the sliding surfaces 6 and 8.

Outer ring portion 10b of the first adjustment ring 10
A sheet receiver 16 is slidably fitted into the cylindrical inner wall surface 14 of the second adjustment ring 11 and the cylindrical inner wall surface 15 of the outer ring portion 11b of the second adjustment ring 11 in a sealed state with a seal member 38, respectively. Adjustment ring disc parts 10c, 11c and seat receiver 1
A spring, for example a disc spring 17, is arranged between the end face of the spring 6 and the end face of the spring 6.

A ring-shaped seat 20 having a spherical recess that circumscribes the spherical surface of a ball 19 that is incorporated into the interior space of the main body 1 through an opening 18 is fixed to the seat receiver 16 . The seat 20 can also be constructed integrally with the seat receiver 16.

The inner through holes of the adjustment rings 10, 11 and the sheet receiver 16 are formed as flow paths communicating with the inflow port 1 or the outflow port 2. A hole 21 is formed in the ball 19 and communicates with the flow path.
By rotating the hole 9, the hole 21 is switched between a position where the flow path communicating with the inlet 1 and a flow path communicating with the outlet 2 are cut off and a position where the flow path is communicated with each other.

The rotation of the ball 19 manually or mechanically rotates a stem 23 that is removably engaged with a shaft portion 22 formed on the ball 19 by a known method. The stem 23 is supported in a sealed state by a gland packing 26 on a gland housing 25 that is fixed to or integrally formed with a lid 24 that covers the opening 18 of the main body 3.

The sliding surfaces 6 and 8 of the main body 1 and the adjustment ring 1
Between the outer peripheral surfaces of the inner rings 10a, 11a of the main body, the stepped wall portions 7, 9 of the main body and the adjusting rings 10, 1
The space formed between the disc parts 10c and 11c of the main body 1 is formed as sealing regulating fluid chambers 27 and 28, and as shown in FIG. Supply channel 2 to open
Fluid is introduced from 9.

The supply path 29 has a nipple 30 screwed onto its inlet and a hose 32 connected to a pump 31 (which may be a fluid supply pump already installed in the factory). The nipple 30 has a structure of a kind of check valve, for example, has a ball and a spring, and has a structure that allows fluid to flow in but prevents fluid from flowing out, and is configured so that the hose 32 can be easily attached to and detached from the nipple 30. Once the hose 3 is
2, and there is no need to fixedly arrange a hose and a pump to each ball valve, eliminating the need for unnecessary piping.

An indicator 33 is fixed to the main body 3 in communication with one of the supply paths 29 through a branch path. In the illustrated example, the indicator 33 is formed to communicate with the opening of the supply passage 29, and the nipple 30 is formed so as to communicate with the supply passage 29 through a branch pipe, but it is also possible to form the indicator 33 in the opposite manner.

Indicator 33 is piston 3 as an indicator
The piston 34 is slidably housed in the casing 35 and integrally has an opening that communicates with the supply passage 29 when attached to the main body 1. A spring 36 is arranged to press against the end having the opening. The casing 35 is provided with a sealed viewing window 37 through which the inside can be seen.
is marked with a scale. Fluid leakage can be detected by the relative position of the end face of the piston 34 in the casing 35 or the indicator scale drawn on the outer peripheral surface of the piston 34.

The strength of the spring 36 of the indicator 33 is set depending on the sealing surface pressure of the seat 20 against the ball 19 of the ball valve, i.e. the fluid supplied by the pump pushes the piston 34 and the spring 36 is pushed up to the scale indicating the initial position of the piston. The lower limit of the piston is maintained so that the pressure exerted by the fluid on the seat 20 when the piston is pushed in by compressing the piston becomes a predetermined surface pressure, and even if the fluid leaks, the piston 34 is pushed by the spring 36. The strength of the spring 36 is set so that the fluid pressure is maintained at approximately a predetermined pressure while the piston moves to the scale position indicating .

In this way, even if fluid leaks within the ball valve, the sealing surface pressure of the seat 20 can be maintained. By checking the indicator sight glass and replenishing the fluid appropriately before the piston reaches its lower limit position, the seat can always maintain the optimum surface pressure.
There is no need to worry about a drop in surface pressure due to leakage.

When assembling the ball 19, adjust the adjustment ring 10,
The ball 19 is inserted into the main body 3 with the ball 11 pushed in, and fluid is injected into the sealing regulating fluid chambers 27 and 28 by the operation of the pump 31. In this case, fluid may be supplied to each chamber 27, 28 individually from each supply path 29, or in some cases, fluid may be supplied to both chambers 27, 29 from either one of the supply paths 29 at the same time.
It is also possible to supply fluid to the

With the seat 20 being pressed against the ball 19 with a predetermined pressure through the elastic force of the disc spring 17, the adjustment ring 11 on the outlet side can be locked to the main body 3 by a locking ring 39 fixed with a screw or the like. can.

As a result, whereas conventionally it required a lot of time and force during assembly to adjust the pressing force of the seat against the ball by turning the adjusting screw, the present invention allows the adjusting screw to be adjusted in a short time by supplying fluid. can be brought into a predetermined pressed state. Moreover, there is no need for the operator to apply great force.

During long-term use, the seat may wear out, and the wear compensation provided by the disc spring 17 may not be sufficient. In this case, conventionally it was necessary to turn the adjusting screw with a large torque, but with the present invention, the desired sealing state can be easily maintained by simply connecting a hose to the nipple and replenishing fluid by operating a pump. . A drop in seal pressure or leakage of fluid due to wear of the seat due to use can be easily detected by the indicator 33, and a predetermined seal pressure can be maintained at all times simply by replenishing the body with the pump. Expansion and contraction of the fluid is compensated by movement of the indicator piston.

During use, when the adjustment ring on the outflow side is locked, it is sufficient to replenish only the adjustment fluid chamber for the seat for the adjustment ring on the inlet side, but it is also possible to replenish both. In this case, both sealing regulating fluid chambers are communicated with each other within the main body,
If the fluid is supplied from one of the supply channels by a pump, both chambers can be replenished at the same time.

According to the present invention, it has become possible to always maintain a predetermined seal reliably with a simple structure and without requiring much labor.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a ball valve according to the present invention, and FIG. 2 is a partial view showing an example of the structure of a fluid supply section and an indicator using a pump. 1... Inlet, 2... Outlet, 3... Main body, 1
0,11...adjustment ring, 16...seat holder,
17... disc spring (spring), 19... ball, 20
... Seat, 27, 28 ... Seal regulating fluid chamber, 29 ... Supply path, 30 ... Nipple, 31 ...
...Pump, 33...Indicator.

Claims (1)

[Claims] 1 A main body having an inlet and an outlet, a ball rotatably incorporated into the main body, a sheet pressed against the ball, a spring pressing the sheet against the ball, and the spring held in a predetermined position. In the ball valve having an adjusting member for holding, the adjusting member is formed as an annular adjusting ring slidably mounted on the body, and a space sealed between the adjusting ring and the body serves as a sealing adjusting fluid chamber. A ball valve comprising: a supply passage formed in the main body and communicating with the space; a fluid supply pump connectable to the supply passage; and an indicator communicating with the supply passage.