JPH0135113Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention is based on the fluid pressure difference within the pipe.
Regarding the check valve in which the valve seat 2 is moved toward and away from the valve seat 2,
In particular, this check valve is designed to significantly reduce costs by reducing the thickness of the pipe.

[Prior Art] Conventionally, as shown in FIG. 2, the band stopper of a check valve is formed by rolling the outer circumferential surface of the pipe to form protruding ring-shaped band stoppers 4 and 6 on the inner circumferential surface of the pipe. was forming.

Therefore, a U-shaped groove was formed on the outer peripheral surface of the pipe.

[Problems to be solved by the invention] In this conventional check valve 7, the valve body 3 receives an impact force when the valve is opened, and the rear portion of the valve body 3 may bite into the band stopper 6, resulting in malfunction. In order to avoid this, increase the amount of protrusion of the band stopper into the pipe,
Although the inner diameter was made smaller, there was a problem that the pipe wall thickness became too thin and the pipe could burst.

[Means for Solving the Problems] An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a longitudinal cross-sectional view of a check valve 7 according to the present invention, in which a pipe 1 and a valve seat 2 are airtightly fixed by a strap 4. As shown in FIG.

The valve body 3 is installed in the pipe so that it approaches and separates from the valve seat 2 due to the fluid pressure difference within the pipe. Behind the valve body 3, there is a U-shaped groove formed by rolling from the outside of the pipe. A thick band fastening part 5 is formed by applying pressure and crushing in the axial direction of the pipe so that the left and right ends are in close contact with each other, and this band fastening part is configured to serve as a stopper for the valve body 3. .

[Effects of the invention] As explained above, the present invention can prevent the pipe wall thickness at the strapping part from becoming thinner by simply pressing the conventional U-groove pipe itself in the axial direction. This is a practical idea that allows the pipes to be made thinner than the pipes used in check valves, which in turn has the effect of reducing costs and weight.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the check valve of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional check valve. 1 is a pipe, 2 is a valve seat, 3 is a valve body, 4, 5, 6
is a belt stopper, and 7 is a check valve.

Claims (1)

[Scope of utility model registration request] In a check valve in which the valve body 3 is brought into contact with and separated from the valve seat 2 by a fluid pressure difference within the pipe, the left and right ends of a U-shaped groove formed by rolling from the outside of the pipe are in close contact with the rear of the valve body. A check valve characterized in that a thick-walled band stopper part 5 is formed by pressurizing and crushing a pipe in the axial direction.