Safety valve

Abstract

The invention discloses a safety valve, which comprises a valve pocket, a spring seat, a liquid inlet joint, and also comprises a valve core assembly and a push rod, wherein the liquid inlet joint is provided with a liquid inlet hole; the valve core assembly is movably arranged in the valve pocket and is further used for controlling the opening and the closing of the liquid inlet hole; the push rod is located between the valve core assembly and the spring seat; the valve pocket is provided with a liquid discharge hole. According to the safety valve provided by the invention, by arranging the movable valve core assembly inside a valve body, the valve core assembly can be used for controlling the on / off of an oil way from the liquid inlet hole to the liquid discharge hole; the mass-flow overflow can be realized after the valve core assembly is far away from the liquid inlet joint; the flow of the safety valve is greatly improved; the axial displacement of the valve core assembly can be shortened by short-time quick overflow; the axial deformation of a reset spring can be reduced when the axial displacement of the valve core assembly is shortened; finally, the pressure fluctuation can be decreased.

Description

technical field [0001] The invention belongs to coal mine fully mechanized mining hydraulic support, in particular, the invention relates to a safety valve. Background technique [0002] With the large-scale implementation and development of coal mine fully mechanized mining hydraulic supports, fully mechanized mining work has more and more stringent requirements for hydraulic supports, so there are further requirements for the safety valve of the hydraulic cylinder of the protection support, especially for the safety valve There are further requirements for the service life and reliability of the hydraulic support. When the pressure from the top of the hydraulic support causes passive force, whether the safety valve can unload in a short time, fully and stably under the condition of high pressure directly affects the service life of the support. and support security. It will not only damage seals, pipes and hydraulic components, but also cause vibration and noise; sometime...

AI Technical Summary

Problems solved by technology

[0004] The overflow channel of the existing safety valve adopts the liquid passage hole arranged around the side wall of the valve core. The diameter of the liquid passage hole is small, resulting in small discharge flow and large flow loss. The seat bears the axial force exerted by the return spring, which leads to poor stress on the valve core and large pressure fluctuations during the working process, which leads to generally unsatisfactory closing pressure of the safety valve, and eventually leads to failure of the hydraulic components connected to the safety valve. Such as excessive loss of oil in the high-pressure cylinder, resulting in waste

The sealing effect between the spool and the valve sleeve is not ideal, and the processing accuracy of the groove on the surface of the spool for installing the seal is not easy to control

In addition, the spring cavity inside the valve housing is in an open state, and the dustproof, waterproof and rustproof effects are poor, which reduces the service life of the safety valve

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