JPS5821963Y2 - Ball valve body support device for spherical valves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ball valve body support device for a spherical valve, which allows a ball valve body having a fluid flow path in the center to be accurately supported on a valve body.

Conventionally, as shown in FIGS. 1 and 2, a pole holder 5 is attached with a pin 6 between ears 7, 7 of closures 2, 2' of a spherical valve body V.

The upper and lower shaft bodies 9, 9' of the ball valve body 4 are rotatably mounted on the upper and lower ball holders 5, 5, and in the final stage of assembly, the intermediate body 9, 9' is mounted between the closures 2', 2'. are welded at weld line 3.

In this case, the welding shrinkage is generally 1.5±0.5m,
It is about 1 m, and there is a variation of about 1 m at maximum.

Therefore, the distance between the left and right ear portions 7, 7 varies by approximately 1 m, depending on the upper and lower portions.

As a result, the length of the ball receiver 5 is taken as the shrinkage allowance for welding.
For example, if the distance between the left and right ears 7, 7 is assumed to be 1.5 m, then the welding shrinkage is 1.5 m.
If it is larger than m, m, it becomes a restrained weld and defects such as cracks are likely to occur in the welded part.

On the other hand, if the shrinkage margin is smaller than 1.5 m, the end face of the ear part 7 and the end face of the pole holder 5 do not come into contact with each other, and therefore the ball valve body 4 is moved in the flow path direction. In addition, it becomes movable, and as a result, the sealing performance of the seat ring device S of the spherical valve deteriorates.

Further, the sealing material 16 provided on the stem cover 14 through which the stem 13 of the ball valve body 4 is inserted also applies to the ball valve body 4.
The slight movement of the stem 13 causes a seal failure, and the stem 13
This causes an increase in operating torque due to poor rotation.

The present invention was developed based on the fact that such defects are caused by not taking measures to absorb variations in the shrinkage margin of welding. The purpose is to eliminate the above-mentioned defects by absorbing them.

This will be explained with reference to FIGS. 3, 1 and 4, which are one embodiment of the present invention.

Ears 7 of the left and right closures 2, 2' of the spherical valve body V
, 7 with a pin 6, an inclined surface is formed on one end surface 5' of the upper and lower ball holders 5, 5, and a wedge-shaped space T' is formed between the end surface 5' of the corresponding ear part 7. .

Note that this inclined surface may be formed toward the end surface of the ear portion 1,
Furthermore, it may be formed on both end surfaces of the ear part 7 and the pole receiver 5.

A wedge 10 is pushed into this wedge-shaped space 7' in the direction toward the center of the flow path.

A dovetail groove 10' is provided on the upper end surface of the wedge 10, and this dovetail groove 1
The lower end of the push bolt 11 is rotatably attached to 0'.

The push bolt 11 is screwed into the closure 2 of the valve body V.

Reference numeral 12 denotes a blind plug that is disposed above the push bolt 11 and screwed onto the closure 2.

A through hole 10" larger than the outer diameter of the pin 6 is formed in the middle of the wedge 10.
is bored so that the vertical movement of the wedge 10 itself is not restricted by the pin 6.

The intermediate body 1 is welded to the weld line 3 between the closures 2 and 2', and the lower protruding surface 14' of the stem cover 14 is fitted into the fitting hole 1' drilled in the center of the upper part of the intermediate body 1. The stem cover 14 is fixed to the intermediate body 1 with bolts or the like.

In this case, the lower part 1i 4'117 of the stem cover 14)
The stem cover 14 is attached so as to be movable and adjustable in the flow path direction by making the outer diameter smaller than the diameter of the fitting hole 1' of the intermediate body 1.

A stem 13 fixed with a pin 15 to an upper shaft body 9 of a ball valve body 4 having a fluid flow path 4' is inserted through the center of the stem cover 14.

16 is the sealing material.

8 is a bearing, 17 is a bearing for supporting the weight of the ball valve body 4, and S is a seat ring device.

I will describe its effects.

When welding intermediate body 1 to closures 2 and 2',
Remove the wedge 10 and then remove the stem cover 14.

After welding them together at the welding line 3, the wedge 10 is pushed in by tightening the push bolt 11, and the movement of the upper and lower ball receivers 5, 5 in the flow path direction is restrained.

Then, the stem cover 14 is fixed to the intermediate body 1 so that the center line of the stem cover 14 and the center line of the ball valve body 4, that is, the center line of the stem 13 are aligned.

As described above, according to the present invention, there is a fluid flow path 4 in the center.
Upper and lower shaft bodies 9, 9' are provided on the upper and lower sides of the ball valve body 4 having a ball valve body 4 having a ball valve body 4. Side end face 5. ' and weld line 3
, 3 to form a wedge-shaped space 7' between the intermediate body 1 and the end surface of the ear part 1 of the closure 2 welded in the middle, and push the wedge 10 into this space 7'. Since the stem cover 14 on which the stem 13 fixed to the upper shaft body 9 of the ball valve body 4 is fitted is movable and adjustable in the direction of the flow path, the wedge 10 pushed into the wedge-shaped space 7' is removed. By adjusting the push-in amount, the effects of welding shrinkage or its variations are completely eliminated, and the welding between the intermediate body 1 and the closures 2, 2' does not become constrained welding, and the welding after welding Ball receiver 5,
5 is fixed in the direction of the flow path, the center of rotation of the ball valve body 4 is always constant, improving the sealing performance of the IJing device S, etc., and furthermore, the stem cover 14 can be moved and adjusted in the direction of the flow path. By attaching the intermediate body IK to the stem 130, the center of rotation of the stem 130 is always constant, so the sealing material 1
The sealing performance of 6 is also improved, and there is no increase in operating torque due to poor rotation, and the rotational operation can always be performed stably.

[Brief explanation of drawings]

Figure 1 is a vertical side view of the spherical valve showing the conventional device, Figure 2 is a cross-sectional plan view thereof, Figure 3 is a vertical side view of the device of the present invention, and Figure 4 is an enlarged vertical side view of its main parts. It is a diagram. 1... intermediate body, 2... closure, 2'...
・Closure, 4... Ball valve body, 4'... Fluid flow path, 5... Pole holder, 7... Ear part, 7'... Wedge-shaped space, 9... Upper shaft Body, 9'...lower shaft body, 1
0... Wedge, 13... Stem, 14... Stem cover.

Claims (1)

[Scope of utility model registration request] Upper and lower shaft bodies 9, 9' are provided on the upper and lower sides of the ball valve body 4 which has a fluid flow path 4' in the center, and each of the shaft bodies 9, 9' is fitted into the ball holders 5, 5, and the ball holder 5, one end surface 5 of 5
' and the end surface of the ear part 7 of the closure 2 to which the intermediate body 1 is welded in the middle at the welding lines 3, 3, a wedge-shaped space 7' is formed, and the wedge 10 is pushed into this space T',
In addition, the upper shaft body 9 of the ball valve body 4 is attached to the intermediate body 1.
A pole valve body support device for a spherical valve in which a stem cover 14, into which a stem 13 fixed to a stem 13 is fitted, is attached so as to be movable and adjustable in the flow path direction.