Safety valve

Abstract

The invention discloses a safety valve. The safety valve comprises a valve body, a liquid inlet connector with a liquid inlet hole, a spring seat and a reset spring and further comprises a valve element assembly which is movably arranged inside the valve body and used for controlling the liquid inlet hole to be opened and closed, the valve body is provided with a liquid discharging hole, the valve element assembly comprises a sliding base, a threaded sleeve arranged inside the sliding base and a valve gasket arranged inside the threaded sleeve, and the spring seat is provided with a first boss inserted into the reset spring. Through arranging the movable valve element assembly inside a valve shell, the valve element assembly can be used for controlling on-off of an oil path from the liquid inlet hole to the liquid discharging hole; when the valve element assembly gets away from the liquid inlet connector, large-flow overflowing can be achieved, the flow of the safety valve is greatly improved, and rapid overflowing within short time can reduce the axial displacement of the valve element assembly; in this way, axial deformation of the reset spring can be reduced, and finally pressure fluctuations can be reduced.

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 chamber inside the valve housing is in an open state, the stability of the spring seat is poor when moving, and the dustproof, waterproof and rustproof effects in the spring chamber are poor, which reduces the service life of the safety valve

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