JPS59113374A - Fluid valve unit - Google Patents

Abstract

PURPOSE:To reduce the cost of a fluid valve unit and make it compact, by providing a fluid passage in a ball valve and inserting a check valve and a check valve drop-off prevention member in the fluid passage. CONSTITUTION:A ball valve 2 is provided with a fluid passage 10 whose cross- sectional area is larger on the downstream side than on the upstream side. A check valve 12 made of a small ball is inserted in the fluid passage 10 so that the check valve can be seated on an upstream step 11. A member 13 for preventing the check valve 12 from flowing out of the fluid passage 10 is secured by a screw in the downstream open part of the passage. Since the check valve 12 does not need to be installed in a pipe passage separately from a fluid valve unit, its cost is reduced and it is made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid valve, and particularly to a fluid valve with a check function.

As is well known, water stop valves used in waterworks, etc. are required to have a check function to prevent sewage from flowing back even in the event of a downstream water pipe bursting accident. be. Conventionally, measures such as incorporating a small check valve on the downstream side of the water stop valve have been taken in order to meet such requests. Equipment costs are extremely high.

In order to solve the above-mentioned conventional problems, the present invention aims to obtain a fluid valve with a check function. In a fluid valve in which the ball valve is opened and closed from the outside with a spindle connected to the ball valve, a flow path having a larger cross-sectional area on the downstream side than the upstream side is bored in the ball valve, and small balls are formed in this flow path. The present invention proposes that a check valve be installed in the flow path, and a member for preventing the check valve from being pulled out is placed in the same flow path.

Embodiments of the invention will now be described in detail with reference to the drawings.

FIG. 1 shows a fluid valve according to a first embodiment of the present invention, in which a base material 1t/'i and a circle fm are connected to a fluid pipe (not shown).
A shaped sleeve 1a and plug screws lb screwed into both ends of the sleeve 1a.

1C. That is, the plug screw 1b is connected to the upstream side of the fluid pipe, and the plug screw 1c is connected to the downstream side of the fluid pipe, and a seal ring on which the ball valve 2 is seated is attached to the inner end of the plug screw 1b. 3 and 4, respectively.

The sleeve 1aKFi is also formed with a diametrical through hole 5, in which a spindle 7 having a protrusion 7a which is connected to a slot 6 of the ball valve 2 is rotatably positioned. The outer end 7b of the spindle 7 Kl! An external operating handle 8 is attached with a nut 9, thus
The ball valve 2 can be opened and closed by manually operating the external operating handle 8.

A passage 10 is penetrated through the inside of the ball valve 2 and can communicate between the plug screw 1b and the plug screw IC. The cross-sectional area of the flow path 10 is larger on the downstream side than on the upstream side, and a check valve 12 made of a small ball that can be seated on the step surface 11 on the upstream side is located inside the flow path 10. Then, a check valve extraction prevention member 13 that prevents the check valve 12 from flowing out from the flow path 10 is screwed to the downstream opening of the flow path 10 . That is, the check valve extraction prevention member 13ri of the illustrated embodiment is molded from a suitable synthetic resin material, and the opening screw 10a of the flow path 10.

It consists of a ring 13a screwed into the ring 13a, and an abutment protrusion 13c supported by a plurality of lips 13b integrally formed in the centripetal direction of the ring 13a.

However, the reverse eleven valve pull-out prevention member 1 in the present invention
3 is not limited to such a structure; for example, as shown in the second figure, a support body 13A formed with a spherical seat 14 for receiving the check valve 12 is integrally molded on the centripetal part of the lip 13B, and the non-return valve 12 is The phenomenon of "dancing" of the valve 12 may be prevented.

As is clear from the above explanation, since the fluid valve of the present invention has the above structure, the manufacturing cost is lower than the conventional case where a check valve separate from the fluid valve is incorporated into the pipeline. Since the check valve is much cheaper and the inside of the ball valve is used as the space for installing the check valve, the overall size can be reduced, and it can be easily installed in spaces with limited space.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a fluid valve according to a first embodiment of the present invention, and FIG. 2 is a sectional view of a fluid valve according to an embodiment of fAλ of the present invention. DESCRIPTION OF SYMBOLS 1...Base material, 2...Ball valve, 7...Spindle, 8...External operation handle, ]0...Flow path,
12... Check valve, 13... Check valve removal prevention member. Patent applicant: Roku Giken Co., Ltd.

Claims (1)

[Claims] 1) In a fluid valve in which a ball valve is located in a base material connected to a fluid pipe, and the ball valve is opened and closed from the outside by a spindle connected to the ball valve, the ball valve has a disconnection on the downstream side rather than the upstream side. A fluid valve characterized in that a flow path with a large area is bored, a check valve made of a small ball is placed in the flow path, and a member for preventing the check valve from being pulled out is placed in the flow path.