JPH03213795A - Check valve - Google Patents

Abstract

PURPOSE:To prevent the breakage of a pipe due to the impact force in the case when a valve body is opened, by forming a stop part of the valve body and a connection part for other pipe through the pipe contraction work from outside the pipe, on the valve body, in a check valve in which the valve body can be attached and separated from a valve seat by the fluid pressure difference. CONSTITUTION:The outer peripheral surface of a pipe 8 in which a valve body 3 which is attached and separated from a valve seat 21 is built in is applied with the rolling work, and a projecting ring-shaped stop part 5 for fixing the valve seat 2 is formed on the inner peripheral surface of the pipe 8. An inclined stop part 9 for the valve body 3 and a connection part 10 having an arbitrary pipe diameter are formed through the contraction pipe work from outside the pipe 8 on the downstream side of the valve body 3. Accordingly, the destruction of the pipe by the valve body impact force in the case when the valve is opened is prevented. Further, the fitting to the arbitrary connection pipe diameter is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a check valve in which a valve body is brought into contact with and separated from a valve seat by a fluid pressure difference within a pipe.

2. Description of the Related Art Conventionally, the stop portion of a check valve has been formed by rolling the outer circumferential surface of the pipe to form a protruding ring-shaped stop portion on the inner circumferential surface of the pipe. Therefore, a U-shaped groove is formed on the outer peripheral surface of the pipe.

An example of the conventional check valve described above will be described below with reference to FIG.

FIG. 2 is a sectional view of a conventional check valve.

1 includes a valve body 3 that approaches and separates from the valve seat 2, and a stopper 5 that fixes the protruding ring-shaped valve seat 2 to the inner circumferential surface of the pipe 4 by rolling the outer circumferential surface of the pipe 4. The valve body 3
This is a check valve consisting of a stop portion 6.

The check valve configured as described above is a check valve in which the square body 3 is brought into contact with and separated from the valve seat 2 by a fluid pressure difference within the pipe.

Problems to be Solved by the Invention However, with the above configuration, the valve body 3 receives an impact force when the valve is opened, and its rear portion may bite into the stopper 6, resulting in malfunction.In order to avoid this, the stopper 6 is The inner diameter is made smaller by increasing the amount of protrusion into the pipe 4. However, at this time, the wall thickness of the pipe 4 becomes too thin, causing the pipe 4 to break and become impregnated.Also, if the connecting pipes have different diameters, However, there were problems in that the pipe diameter needed to be made to match the connecting pipe, or a separate pipe for the joint was required.

The present invention solves the above-mentioned conventional problems, and aims to provide a check valve that does not cause the pipe to burst due to the impact force when the valve body opens, and that allows connecting pipes with different diameters. It is something to do.

Means for Solving the Problems In order to achieve the above object, the check valve of the present invention has an inclined valve stopper formed on the downstream side of the valve body by pipe shrinking from the outside of the pipe, and further includes a connecting pipe. It is formed to a pipe diameter that matches the pipe diameter.

Effect: According to the above structure, the inclined valve body stopper formed by the contraction of the pipe has almost no difference in thickness from the original wall thickness of the pipe, and the pipe does not burst due to the impact force when the valve body is opened. The pipe diameter can be adjusted to match the connecting pipe.

Example An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of a check valve according to the present invention.

Reference numeral 7 denotes a valve body 3 that approaches and separates from the valve seat 2, a stop portion 5 that fixes the protruding ring-shaped valve seat 2 to the inner circumferential surface of the pipe 8 by rolling the outer circumferential surface of the pipe 8, and the valve. body 3
This is a check valve in which an inclined valve body 3 stopping portion 9 and an arbitrary pipe diameter 1o are formed by pipe shrinking from the outside of a downstream pipe 8.

The operation of the check valve configured as described above will be explained below.The valve body 3 is brought into contact with and separated from the valve seat 2 by a fluid pressure difference in the pipe 8.When the valve is opened, the valve body 3 The pipe 8 on the downstream side of the body 3 is stopped at an inclined stop 9 which is made by contracting the pipe 8 . Also, by constricting the pipe, connect the pipe at an arbitrary pipe diameter of 1° that matches the diameter of the connecting pipe.

As described above, according to this embodiment, the pipe 8 behind the valve body 3
By forming a sloped stop part from the outside by shrinking the pipe, it is possible to prevent the pipe 8 from bursting due to the impact force of the valve body 3 when the valve is opened. It is possible to make the pipe diameter 1o.

Effects of the Invention As described above, by forming the inclined stop portion due to pipe contraction and the pipe diameter matching the connecting pipe diameter, pipe rupture due to the impact force of the valve body when the valve is opened can be prevented, and Since it can be matched to the diameter of the connecting pipe, it is possible to create an excellent check valve that is compatible with the same model.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a check valve showing one embodiment of the present invention, and FIG.
The figure is a sectional view of a conventional check valve. 2... Valve seat, 3... Valve body, 8...
... Pipe, 9... Stop part, 1o...
connection pipe.

Claims (1)

[Claims] In a check valve in which a valve body is brought into contact with and separated from a valve seat by a fluid pressure difference in a pipe, an inclined stop portion of the valve body is formed downstream of the valve body by pipe shrinking from the outside of the pipe, and A check valve characterized by forming a connection part with another pipe.