JPH0886367A - Ball valve - Google Patents

Abstract

PURPOSE: To remove a handle without leaking an inside fluid between a body and a stem, in the case of a ball valve having a jumping-out preventive structure. CONSTITUTION: A connector 4 is fitted to a stem 3 so as to be unable to be rotated and attached/detached, and a packing 6 is pressurecontacted between the connector 4 and a body 2, and a handle 5 is fitted to the connector 4 so as to be unable to be rotated and attached/detached, and either of the connector 4 fitting to the stem 3 and the handle 5 fitting to the connector 4 is made unrotatable by inserting a non-circular section shaft into a hole whose shape is suitable for it, and by providing a division ring 7 between the handle 5 hole and the connector 4 shaft inserted into it, the handle 5 and the connector 4 are made to be unable to be attached/detached.

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 or the like in a pipe, and in which a handle can be attached and detached without leakage of internal fluid.

[0002]

2. Description of the Related Art FIG. 5 is a vertical cross-sectional view showing an example of a conventional ball valve having a stem having a pop-out prevention structure, which is integrated with the stem 22 so that the stem 22 does not pop out due to the internal pressure of the valve 21. A collar 22a is provided, and a nut 23 screwed into the outer end portion of the stem 22 fixes the handle 24 to the stem 22 and tightens the packing 25 to prevent fluid leakage from the inside of the body 26 of the valve 21. It is designed to prevent it. In addition, 27 is a gland, 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 packing 25 is released from the pressure contact only by loosening the nut 23, and the body 26
Fluid leaks from inside. Furthermore, the handle 24
In order to remove the handle for a long period of 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 attached again, the nut 23 is loosened, and fluid leaks from the inside of the body 26.

[0004]

The problem to be solved by the present invention is that the conventional ball valve having the stem of the pop-out preventing structure as described above originally removes the handle in order to prevent erroneous operation or tampering operation. It does not have a structure that allows it, and just loosening the nut to remove the handle causes fluid leakage from the inside of the valve.
It is necessary to prepare a separate spacer in order to remove the handle for a long period of time, and also when the handle is attached again, fluid leakage from the inside of the valve occurs.

[0005]

In order to solve the above problems, the present invention has the following constitution. A connector is non-rotatably and non-detachably attached to the stem of the pop-out prevention structure, a packing is pressure-welded between the connector and the body, and a handle is non-rotatably and detachably attached to the connector.

In this case, the attachment of the connector to the stem and the attachment of the handle to the connector are both carried out by inserting a shaft having a non-circular cross section into a hole having a shape adapted to the shaft. It ’s good to make it non-rotatable,
It is preferable that the non-circular cross section of the stem has a shape obtained by cutting a circle to provide two parallel sides, and the non-circular cross section of the shaft of the connector has a shape obtained by cutting a circle and providing four square sides.

A split ring may be provided between the hole of the handle and the shaft of the connector inserted in the hole so that the handle and the connector can be attached to and detached from each other.

[0008]

[Function] Since the connector is attached to the stem of the pop-out prevention structure in a non-rotatable and non-detachable manner, and the packing is pressure-contacted between the connector and the body, the packing is always compressed between the connector and the body, No fluid leakage from inside. Furthermore, since the handle is attached to this connector in a non-rotatable and removable manner, 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 the inside of the body.

The attachment of the connector to the stem is also accomplished by inserting a shaft of non-circular cross section, such as a cross section cut into a circular shape with parallel sides, into a hole of a corresponding shape. Since the handle was attached by inserting a shaft having a non-circular cross section, such as a shape in which the cross section was cut into a circular shape and square four sides were provided, into a hole of a corresponding shape, the rotation was impossible. Easy and reliable processing and assembly of various attachment parts.

Further, a split ring is provided between the hole of the handle and the shaft of the connector inserted in the handle so that the both can be attached and detached. Therefore, the operation of attaching and detaching the detachable attaching portion is easy and reliable. Is. In the ball valve of the present invention, a connector suitable for the present invention is attached to the stem of the ball valve shown in FIG. 5 as a conventional example, and the handle is modified to fit the connector and attached to this connector. By doing so, it can be easily made.

[0011]

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

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,
Reference numeral 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 brim 3a and is of a structure for preventing popping out mounted from the inside of the body 2. The stem 3 is provided with two planes 3b and its cross section is cut into a circular shape to be parallel. The connector 4 has a shape with two sides, and the hole of the connector 4 has a shape adapted to the cross-sectional shape of the stem 3. The connector 4 is mounted on the stem 3 and is provided on the outer end portion 3c of the stem 3. The nut 16 is screwed and fixed to the screw, and 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 outer surface of the connector 4 is provided with four flat surfaces 4a, and the cross section has a shape obtained by cutting a circle to provide four square sides. The flat surface portion 5a provided in the hole of the handle 5 is the 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 of FIG. 1 and the shaft of the connector 4 inserted in the hole to form a structure as shown in the figure, and the detachable ring was attached.

The above-mentioned 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 pop-out prevention structure, and the packing 6 is provided between the connector 4 and the body 2.
Since the packing 6 is pressed, the packing 6 is always compressed between the connector 4 and the body 2, and the fluid does not leak from the inside of the body 2. Further, since the handle 5 is non-rotatably and detachably attached to the connector 4, even if the handle 5 is detached from the connector 4 in order to prevent erroneous operation or tampering, the packing 6 still remains between the connector 4 and the body 2. Since it has been compressed, the compressed state does not change, and fluid leakage from the inside of the body 2 does not occur.

The connector 4 is attached to the stem 3 by inserting a shaft having a circular cross section with parallel two sides into a corresponding hole, and also to attach the handle 5 to the connector 4. Was made non-rotatable by inserting a shaft having a square cross section and a square four sided shape into the corresponding holes, so that the machining and installation of these non-rotatable mounting parts are easy and reliable. is there.

Further, since a split ring is provided between the hole of the handle 5 and the shaft of the connector 4 inserted in the handle so as to be attachable / detachable, it is easy to process and attach / detach the attachable / detachable attachment portion. And certain. In the ball valve 1 of the present invention, the stem 22 of the ball valve 21 shown in FIG. 5 as a conventional example is fitted with the connector 4 shown in FIGS. If it is modified into the same shape as 5 and attached to this connector 4, it can be easily manufactured.

[0019]

As described above, according to the ball valve of the present invention, it is extremely easy to remove the handle in order to prevent erroneous operation and mischievous operation. When removing the handle, after removing the handle, and removing the handle. No fluid leaks from the inside of the valve during installation. It can also be made by modifying a conventional ball valve.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an 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 of a mounting part of the ball valve shown in FIGS. 1 and 2 on a stem.

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

FIG. 5 is a vertical 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

Claims (4)

[Claims] 1. A connector having a non-rotatable and non-detachable attachment to a stem having a pop-out prevention structure, a packing being pressed against the connector and the body, and a handle attached to the connector in a non-rotatable and detachable manner. And a ball valve. 2. The attachment of the connector to the stem and the attachment of the handle to the connector are both carried out by inserting a shaft of non-circular cross section into a correspondingly shaped hole, whereby rotation is achieved. 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 obtained by cutting a circle to provide two parallel sides, and the non-circular cross section of the shaft of the connector has a shape obtained by cutting a circle to provide four square sides. The ball valve according to claim 2, which is characterized. 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 can be attached to and detached from each other. The ball valve according to any one of claims 1 to 3.