JP2849668B2 - Ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve which is used for controlling the flow of water, oil, gas and the like in a pipe, and which can be detachably mounted on a handle without leaking internal fluid.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional view showing an example of a conventional ball valve having a stem having a projection preventing structure, and is integrated with the stem 22 so that the stem 22 does not jump out due to the internal pressure of the valve 21. A collar 22a is provided, and a nut 23 screwed into the outer end of the stem 22 fixes the handle 24 to the stem 22 and tightens the packing 25 to prevent fluid leakage from inside the body 26 of the valve 21. To prevent it. In addition, 27 is a ground, 28 is a disc spring, and 29 is a spring washer.

In this structure, when the handle 24 is removed to prevent an erroneous operation or a mischievous operation, the pressure contact of the packing 25 is released only by loosening the nut 23 and the body 26 is removed.
Fluid leaks from the inside of the device. Further, the handle 24
In order to remove the handle for a long time, a spacer instead of the handle 24 must be mounted between the spring washer 29 and the disc spring 28. Also, when the handle 24 is mounted again, the nut 23 is loosened, and fluid leakage from the inside of the body 26 occurs.

[0004]

The problem to be solved by the present invention is that the conventional ball valve having the stem having the structure for preventing protrusion as described above originally removes the handle in order to prevent erroneous operation and mischievous operation. It is not structured so that fluid can leak from the inside of the valve just by loosening the nut to remove the handle.
In order to remove the handle for a long period of time, it is necessary to prepare a separate spacer, and when the handle is mounted again, fluid leaks from the inside of the valve.

[0005]

The present invention has the following configuration in order to solve the above-mentioned problems. The connector was non-rotatably and non-detachably attached to the stem having the pop-out prevention structure, the packing was pressed against the connector and the body, and the handle was non-rotatably and detachably attached to the connector.

In this case, the mounting of the connector to the stem and the mounting of the handle to the connector are both performed by inserting a shaft having a non-circular cross section into a hole having a shape adapted to the shaft. It is good to make it impossible to rotate,
It is preferable that the stem has a non-circular cross section having a shape in which two parallel sides are provided by cutting a circle, and the shaft of the connector preferably has a shape in which a square is provided by cutting a circle.

[0007] A split ring may be provided between the hole of the handle and the shaft of the connector inserted in the hole to make the handle and the connector detachable.

[0008]

[Function] Since the connector is mounted on the stem of the anti-protrusion structure in a non-rotatable and non-detachable manner and the packing is pressed against the connector and the body, the packing is always compressed between the connector and the body. No fluid leakage from inside. Further, since the handle is non-rotatably and detachably attached to this connector, even if the handle is removed from the connector to prevent erroneous operation or tampering, the packing is still compressed between the connector and the body. There is no change in the compressed state, and no fluid leaks from inside the body.

The attachment of the connector to the stem can be achieved by inserting a shaft having a non-circular cross section, such as a shape having a circular cross section and two parallel sides, into a hole having a corresponding shape. Since the handle was mounted by inserting a shaft with a non-circular cross section, such as a shape with a square cross section and a square side, into a hole of a corresponding shape, the handle was mounted and the rotation was disabled. Easy and reliable processing and assembling of the mounting part.

In addition, since a split ring is provided between the hole of the handle and the shaft of the connector inserted therein to make the both detachable, the processing of attaching and detaching the detachable mounting portion is easy and reliable. It is. In the ball valve of the present invention, a connector suitable for the present invention is mounted on the stem of the ball valve shown in FIG. 5 as a conventional example, and the handle is modified so as to be compatible with the connector. By doing so, it can be easily made.

[0011]

1 is a longitudinal sectional view showing an embodiment of a ball valve according to the present invention, FIG. 2 is a partially enlarged sectional view of FIG. 1, and FIG. 3 is a sectional view shown in FIGS. FIG. 4 is an exploded view showing an exploded view of an attached part of the ball valve to the stem, and FIG. 4 is a plan view of the connector shown in FIGS.

1 to 4, 1 is a ball valve, 2 is a body, 3 is a stem, 4 is a connector, 5 is a handle, 6 is a packing, 7 is a split ring, 8 is a ball, 9 and 10 are Seat ring, 11 is a seat holder,
12 is a thrust washer, 13 is a gland, 14 is a disc spring, 15 is a spring washer, and 16 is a nut.

The stem 3 has an integral flange 3a and has a projection preventing structure mounted from the inside of the body 2. The stem 3 is provided with two flat surfaces 3b. The connector 4 has a shape provided with two sides, and the hole of the connector 4 has a shape adapted to the sectional shape of the stem 3. The connector 4 is mounted on the stem 3 and provided at the outer end 3 c of the stem 3. A nut 16 is screwed into the screw and fixed, so that the stem 3 and the connector 4 are non-rotatably and non-detachably assembled. At the same time, the packing 6 is mounted between the connector 4 and the body 2, and the packing 6 is compressed via the gland 13 and the disc spring 14.

The connector 4 is provided with four flat surfaces 4a on its outer surface, the cross section of which is formed by cutting a circle to provide four square sides, and the flat portion 5a provided in the hole of the handle 5 is formed by a flat surface 4a of the connector 4. The handle 5 is attached to the connector 4 and the handle 5
A split ring 7 was provided between the hole and the shaft of the connector 4 inserted in the hole to make the structure as shown in the figure, and attached detachably.

The above-described shape of the connector 4 can be easily understood by making the plan view of the connector 4 of FIG. 4 correspond to the longitudinal section of the connector 4 shown in FIG.

Next, the operation will be described based on the embodiment shown in FIGS. As described above, the connector 4 is non-rotatably and non-detachably attached to the stem 3 having the protrusion preventing structure, and the packing 6 is provided between the connector 4 and the body 2.
, The packing 6 is always compressed between the connector 4 and the body 2, and no fluid leaks from inside the body 2. Further, since the handle 5 is non-rotatably and detachably attached to the connector 4, even if the handle 5 is removed from the connector 4 to prevent erroneous operation or tampering operation, the packing 6 is still between the connector 4 and the body 2. , And there is no change in the compressed state, and no fluid leaks from inside the body 2.

The attachment of the connector 4 to the stem 3 is performed by inserting a shaft having a shape of a circular cross section with two parallel sides into a corresponding hole, and mounting the handle 5 to the connector 4. Was made non-rotatable by inserting a shaft with a cross section of a circular shape and four square sides into the corresponding holes, making it easy and reliable to machine and mount these non-rotatable mounting parts. is there.

Further, since a split ring 7 is provided between the hole of the handle 5 and the shaft of the connector 4 inserted in the handle 5 so that both can be detached, the processing of the detachable attachment portion and the operation of detachment can be performed. Easy and reliable. This split ring 7 is
Using the expansion and contraction of the ring, the split ring 7 is always expanded and
The dollar 5 is locked, and the handle 5 is pulled in the stem axis direction.
When lifted, the split ring 7 shrinks and the handle 5 can be removed.
When the ring 7 returns to the original state and the handle 5 is fitted
It is fitted in the same way. In addition, the ball valve 1 of the present invention
Is a ball valve 21 shown in FIG.
If the connector 4 shown in FIG. 1 to FIG. 4 which is suitable for the present invention is mounted on the stem 22 of the present invention, the handle 24 is modified into the same shape as the handle 5 and mounted on the connector 4 to easily manufacture.

[0019]

As described above, in the ball valve of the present invention, it is extremely easy to remove the handle in order to prevent erroneous operation or mischievous operation. When removing the handle, after removing the handle, and after removing the handle, No fluid leaks from the interior of the valve during any installation. Further, a conventional ball valve can be modified and made.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a ball valve of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is an exploded view showing an exploded view of a mounting part of the ball valve shown in FIGS. 1 and 2 to a stem.

FIG. 4 is a plan view of the connector shown in FIGS. 1 to 3;

FIG. 5 is a longitudinal sectional view showing an example of a conventional ball valve.

[Explanation of symbols]

 1 ball valve 2 body 3 stem 4 connector 5 handle 6 packing 70 split ring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-135664 (JP, A) JP-A-49-51634 (JP, A) JP-A 1-165370 (JP, U) JP-A 62-135 163372 (JP, U) JP-A 57-90975 (JP, U) JP-A 3-49472 (JP, U) JP-A 4-22678 (JP, U) JP-B 47-2586 (JP, B1) 57-23753 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16K 5/06 F16K 31/60

Claims (4)

(57) [Claims] The present invention is characterized in that a connector is non-rotatably and non-detachably attached to a stem having a protrusion preventing structure, a packing is pressed against the connector and a body, and a handle is non-rotatably and detachably attached to the connector. And ball valve. 2. The mounting of the connector on the stem and the mounting of the handle on the connector, both by inserting a non-circular cross-section shaft into a correspondingly shaped hole, thereby rotating the shaft. 2. The ball valve according to claim 1, wherein the ball valve is disabled. 3. The non-circular cross section of the stem has a shape in which two parallel sides are formed by cutting a circle, and the non-circular cross section of the shaft of the connector has a shape in which a square is formed by cutting a circle. The ball valve according to claim 2, wherein: 4. A split ring is provided between the hole of the handle and the shaft of the connector inserted into the hole, so that the handle and the connector are detachable. 4. The ball valve according to any one of claims 1 to 3.