Safety valve

Abstract

The invention discloses a safety valve, comprising a valve shell and a liquid incoming connector having a liquid inlet and also comprising a valve element component movably disposed in the valve shell and used for controlling the liquid inlet to open or close. The valve shell is provided with a liquid outlet. The valve element component comprises a nut and a valve washer disposed in the nut, and the valve washer has a recessed structure. The overflow safety valve of the invention is provided with the valve element component movably disposed within the valve shell, the valve element component may be used for controlling connection and disconnection of an oil circuit from the liquid inlet to the liquid outlet, high-capacity overflow may be provided when the valve element component is far away from the liquid incoming connector, safety valve flow is greatly increased, short-term quick overflow may reduce axial displacement of the valve element component, the reduction in the axial displacement of the valve element component may reduce axial deformation of a return spring, and finally pressure fluctuation may 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 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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