JP2569950Y2 - Check valve - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention is based on the idea that two semi-disc-shaped valve elements are pivotally supported on a single valve shaft in a main body defining a cylindrical flow path, and the valve elements are always held by a spring. The valve is biased to the closing position, and the valve is opened against the spring by the positive flow pressure flowing through the pipe, and when the backflow occurs, the valve is closed by the spring force of the spring. The present invention relates to a check valve, and more particularly, to a check valve configured to prevent a valve body and a valve body from being broken by an abnormal back pressure generated in a flow rate.

[0002]

2. Description of the Related Art Conventionally, two semi-disc-shaped valve bodies are hingedly supported on a single valve shaft in a main body defining a cylindrical flow passage and wound around the valve shaft. To urge the two valve bodies to the normally closed position, and open the valve body against the spring with the positive flow pressure flowing through the pipeline, and when the reverse flow occurs, the valve is opened by the spring force of the spring. Dual-plate check valves adapted to close the body are known.

In such a check valve, the valve body shifts in the valve closing direction due to the backflow pressure. However, when an abnormal backflow pressure is generated in the pipeline, the abnormal backflow pressure can be absorbed and released. Since it is not possible, abnormal backflow pressure is applied to the valve body, and there is a possibility that the valve body and the valve body may be broken. If it is broken, broken pieces of the valve body and valve body may fall into the pipes, damaging the pipes and various devices attached to the pipes, causing serious accidents, and taking a long time to recover. And had the problem of cost.

[0004]

The problem to be solved by the present invention is that, when an abnormal backflow pressure is generated in a pipeline, the backflow pressure is absorbed and escaped to the downstream side, thereby destroying the valve element and the valve body. Is to prevent.

[0005]

Means for Solving the Problems To solve the above-mentioned problems, a means adopted by the present invention is to provide two semi-disc-shaped valve elements in a valve body having a cylindrical flow path. A check groove which is hinged to the valve shaft and is always urged in the valve closing direction by a spring wound around the valve shaft, and a guide groove extending in the pipe direction is formed in the valve body. The valve shaft is movably supported in the guide groove, and the valve shaft is constantly urged to the upstream side of the backflow by a spring disposed in the guide groove, so that the valve shaft is located downstream of the backflow for a certain distance. A pressure relief groove is formed on the inner peripheral surface of the valve body so that the outer peripheral edge of the valve body is not in contact when the valve body is moved.

[0006]

[Operation] When abnormal backflow pressure is generated in the pipeline, the valve shaft moves in the pipeline direction together with the valve body against the spring, and when the valve reaches the pressure relief groove on the inner surface of the valve body, the backflow pressure is released. Escapes downstream through

[0007]

According to the check valve of the present invention, the abnormal pressure generated in the pipeline is absorbed by the valve shaft moving in the pipeline direction while the valve shaft compresses the spring together with the valve body, and the pressure relief groove. The valve body and the valve body do not break due to abnormal backflow pressure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. In the figure, (1) is a main body having a cylindrical flow path formed therein, and (2) is a main body (1).
There are two semi-disc-shaped valve bodies which are pivotally supported by a single valve shaft (3). Reference numeral (4) denotes a spring which is wound around the valve shaft (3) and urges the two valve elements (2) to a normally closed state. When a positive flow flows through the pipe, the two valve bodies (2) are rotated against the spring (4) by fluid pressure as shown in FIG. 4, and the flow path in the main body (1) is opened. The valve is opened. When a backflow occurs in the pipeline, as shown in FIG. 5, there is no rotating force due to the positive flow pressure, so that the valve element (2) is rotated in the valve closing direction by receiving the resilient force of the spring (4). The flow path in (1) is closed.

A check valve of the dual plate type having two semi-disc-shaped valve bodies is conventionally known, but the present invention relates to such a check valve in which a valve shaft (3) is connected to a valve body (1). Along the guide groove (5) formed on the inner peripheral surface of the valve and extending in the pipe direction, and urges the valve shaft (3) to always move to the upstream side of the backflow. When the valve shaft (3) is moved to the downstream side by a counterflow pressure for a certain distance while compressing the spring (6) on the inner peripheral surface of the valve body (1), the valve body is extended. (2) is characterized in that a pressure relief groove (7) is formed such that the outer peripheral edge is not in contact with the outer peripheral edge.

A guide groove (5) for allowing the valve shaft (3) to move in the direction of the pipeline has a valve body for receiving the upper and lower ends of the valve shaft (3).
The guide groove (5) is formed on the opposed inner wall, and is stretched around the valve shaft (3) with the spring (6) housed in the guide groove (5). The spring (6) has a greater resilience than the designed normal backflow pressure, and the normal backflow pressure does not cause the movement of the valve shaft (3). When an abnormal backflow pressure exceeding the design value is generated in the pipeline, the backflow pressure is applied to the valve body (2) as shown in FIG. 6, and the valve shaft (3) is moved together with the valve body (2) by the spring ( 6) is moved downstream along the guide groove (5) while compressing (6). When the valve shaft (3) moves a fixed distance and the outer peripheral edge of the valve body (2) reaches the pressure relief groove (7), the backflow pressure is discharged downstream through the pressure relief groove (7). You. After the abnormal backflow pressure escapes, the valve shaft (3) is returned to the original position together with the valve body (2) by receiving the elastic force of the spring (6).

In this way, when an abnormal backflow pressure is generated in the pipeline, the valve shaft which moves by compressing the spring (6).
The pressure can be absorbed by the movement of the valve (3) and the valve body (2), and the backflow pressure can be released from the pressure relief groove (7). ) And the valve element (2) also return to the original state by the elastic force of the spring (6), and the function as a normal check valve is restored.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view along a pipeline

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a perspective perspective view of a main part.

FIG. 4 is a diagram showing a time of a forward flow operation;

FIG. 5 is a diagram showing a state at the time of backflow operation.

FIG. 6 is a diagram showing an operation when an abnormal backflow pressure is generated.

[Explanation of symbols]

 (1) Valve body (2) Valve body (3) Valve shaft (4) Spring (5) Guide groove (6) Spring (7) Pressure relief groove

Claims (1)

(57) [Scope of request for utility model registration] In a valve body having a cylindrical flow path, two semi-disc-shaped valve elements are hingedly supported on one valve shaft in a hinge shape, and are always wound by a spring wound around the valve shaft. In a check valve for urging a valve body in a valve closing direction, a guide groove extending in a pipe direction is formed in a valve body, and a valve shaft is movably supported in the guide groove, and the guide groove is The valve shaft is always urged to the upstream side of the backflow by a spring arranged in the valve body. A check valve formed on a peripheral surface.