Pressure reducing valve having shutoff mechanism

Abstract

A high-pressure side primary pressure chamber communicates with a secondary pressure chamber on the side of a pressure receiving device through a communication hole. A diaphragm which receives the pressure in the secondary pressure chamber is provided, and a valve body is connected to the diaphragm. The diaphragm is biased by a spring in a valve opening direction. The area S (mm2) of the pressure receiving surface of the diaphragm and the spring constant k (N / mm) of the spring are set so as to satisfy the following equations (1) and (2). P1S-k[Delta]L>C (1) P1<P2 (2) where P1 denotes the pressure (MPa or N / mm2) of the secondary pressure chamber, [Delta]L denotes the displacement (mm) of the spring, C denotes the minimum closing load (N) of the valve body, and P2 denotes the allowable maximum pressure (MPa or N / mm2) of the pressure receiving device.

Description

technical field [0001] The present invention relates to a pressure reducing valve that depressurizes high-pressure fluid on the supply source side to a predetermined pressure and supplies it to a low-pressure passage where a pressure receiving device exists. A pressure reducing valve with a shut-off mechanism capable of side leakage of high-pressure fluid. Background technique [0002] In a fuel cell, a hydrogen storage tank filled with high-pressure hydrogen is sometimes used as a fluid supply source on the anode side. In systems dealing with such high-pressure fluids, a pressure reducing valve is installed between the supply source of the high-pressure fluid and the pressure-receiving device, and the high-pressure fluid from the fluid supply source is decompressed to a predetermined pressure by the pressure-reducing valve and then supplied to the pressure-receiving device. [0003] As a pressure reducing valve used in such an application, there is known a structure in whi...

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned conventional pressure reducing valve, since various valve mechanisms are incorporated in the pressure reducing valve unit, the internal structure becomes complicated, resulting in an increase in product size and cost.

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