Valve core assembly of overflow safety valve

Abstract

The invention discloses a valve core assembly of an overflow safety valve. The valve core assembly comprises a nut and a valve pad which is arranged in the nut and is used for being matched with a liquid inlet joint of the overflow safety valve. The valve core assembly disclosed by the invention is applied to the overflow safety valve and can be used for controlling the opening and closing of an oil line from a liquid inlet hole to a liquid drainage hole. After the valve core assembly is far away from the liquid inlet joint, the large flow overflow can be realized, and the flow of the safety valve is greatly increased. The rapid overflow within a short time can reduce the axial displacement of the valve core assembly, the reduction of the axial displacement of the valve core assembly enables the reduction of axial deformation of a reset spring, and ultimately the pressure fluctuation 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 valve core assembly of an overflow 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 ...

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

Images