Valve element assembly of pilot-controlled check valve

Abstract

The invention discloses a valve element assembly of a pilot-controlled check valve. The valve element assembly comprises a screw sleeve, a liquid inlet sleeve, a valve seat, a valve sleeve, a large valve element arranged inside the valve sleeve, a small valve element arranged inside the large valve element, a differential valve element movably arranged inside the valve sleeve and used for controlling the large valve element to move, and a pressure adjusting mechanism arranged inside the valve sleeve and used for applying elastic acting force to the differential valve element. According to thevalve element assembly of the pilot-controlled check valve, by arranging the differential valve element inside the valve sleeve, automatic pressure relief of the pilot-controlled check valve can be realized; by arranging the pressure adjusting mechanism, the working pressure of the pilot-controlled check valve can be adjusted so that the pilot-controlled check valve can meet the working requirements of the different pressure, and universality of the pilot-controlled check valve is improved; and the pressure adjusting mechanism is arranged inside the valve sleeve, thus the compactness of the overall structure of the valve element assembly is improved, the integration level of the valve element assembly is high, and disassembly and assembly are convenient.

Description

technical field [0001] The invention relates to a hydraulic component in a hydraulic circuit of a coal mine hydraulic support, in particular, the invention relates to a valve core assembly of a hydraulic control check valve. Background technique [0002] At present, the hydraulically controlled one-way valve used in fully mechanized mining hydraulic supports can only realize the single-cavity liquid inlet blocking and return liquid pressure relief of the matched oil cylinder or column jack. When the pressure rises beyond the working pressure setting value of the hydraulic control check valve, it can only rely on the external overflow valve (ie safety valve) to relieve the pressure, and the outflowing liquid is discharged outside the hydraulic system, which not only pollutes the underground environment, but also causes waste . Moreover, the working pressure of the existing hydraulically controlled one-way valve cannot be adjusted, cannot adapt to the working requirements of ...

AI Technical Summary

Problems solved by technology

When the pressure rises beyond the set value of the working pressure of the hydraulic control check valve, it can only rely on the external relief valve (ie safety valve) to relieve the pressure, and the outflowing liquid will be discharged outside the hydraulic system, which will pollute the underground environment and cause waste

Moreover, the working pressure of the existing hydraulic control check valve cannot be adjusted, and cannot adapt to the working requirements of different pressures, and has poor versatility.

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