Hydraulic control check valve capable of being automatically unloaded

Abstract

The invention discloses a hydraulic control check valve capable of being automatically unloaded. The hydraulic control check valve comprises a valve body, a thread sleeve, a liquid inlet sleeve, a valve seat, a valve sleeve, a large valve core arranged in the valve sleeve, a small valve core arranged in the large valve core, a differential-motion valve core movably arranged in the valve sleeve andused for controlling the large valve core to move and a pressure regulating mechanism used for applying elastic acting force to the differential-motion valve core. According to the hydraulic controlcheck valve capable of being automatically unloaded, through arrangement and cooperation of the differential-motion valve core and the pressure regulating mechanism, automatic pressure relief of the check valve can be achieved, the working pressure of the check valve can be regulated so that the check valve can adapt to working requirements of different pressure, and the universality of the checkvalve is improved.

Description

technical field [0001] The invention relates to a hydraulic component in a hydraulic circuit of a coal mine hydraulic support, in particular to an automatic unloading hydraulic control check valve. Background technique [0002] At present, the hydraulically controlled one-way valve used in the coal mine fully mechanized mining hydraulic support can only realize the single-cavity liquid inlet blocking and return liquid pressure relief to the matching 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 different pre...

AI Technical Summary

Problems solved by technology

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 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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