Pressure opening and closing valve

Abstract

To provide a pressure opening and shutting valve capable of controlling occurrence of beating noises without blocking smoothness of operation. The opening and shutting valve (1) comprises a housing (a housing body 3 and a housing cap 5) having first port (a fluid passage 6) and a second port (hose connecting nozzle 4), and a valve body (positive pressure valve body 7), which is housed in the housing, normally blocking the first port by urging with a spring (a coil spring 8 with a large diameter) and opening when differential pressure between the first port and the second port exceeds a designated value. An axis of urging force for closing a valve by means of the valve body is set to be non-parallel to an axis of a valve seat (a positive pressure valve seat 13) that brings into contact with the valve body.

Description

technical field [0001] The present invention relates to a pressure switching valve, the valve body is arranged in the pipeline, and the valve body is automatically opened and closed according to the pressure difference between the front and rear of the valve body. Range and set the pressure switch valve of the two-way valve between the fuel tank and the tank. Background technique [0002] In order to keep the pressure in the fuel tank of automobiles within a specified range, a pressure switch valve with two-way check function is provided between the fuel tank and the tank of the automobile. The pressure switch valve works like this: when the tank internal pressure rises during oil supply, it can detect the full tank state and close in two directions at the same time. When the temperature rises, etc., when the tank internal pressure exceeds the specified value, Open the valve in the direction that the evaporated gas on the tank is adsorbed to the tank, and open the valve in ...

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned existing pressure switching valve, between the inner peripheral surface of the housing containing the positive pressure valve body and the outer peripheral surface of the positive pressure valve body, turbulent flow will occur when the fluid flows in the positive pressure inside the tank, so that , the vibrating positive pressure valve body collides with the inner peripheral surface of the shell and generates noise

In addition, due to the influence of the vibration of the vehicle body, the positive pressure valve body in the casing jumps, which will also generate noise.

[0006] In order to prevent the occurrence of the above-mentioned noise, although it is conceivable to reduce the fitting gap between the two so that the positive pressure valve body does not jump in the housing, on the basis of ensuring the smooth movement of the positive pressure valve body, the gap is reduced to avoid It's a difficult thing to have this level of noise

That is, it is difficult to prevent the generation of noise while ensuring smooth operation of the conventional pressure switch valve.

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