Hard sealing safety valve

Abstract

The invention discloses a hard sealing safety valve which comprises a valve shell and a liquid inlet connector as well as a valve element component, wherein a liquid inlet is formed in the liquid inlet connector; the valve element component is arranged inside the valve shell; a liquid discharge hole is formed in the valve shell; the valve element component comprises a valve seat and a valve element made of a metal material; a liquid through hole for communicating the liquid inlet and the liquid discharge hole is formed in the valve seat; the valve element is moveably arranged inside the valve seat and is used for controlling opening and closure of the liquid through hole. As the valve element and the valve seat of the hard sealing safety valve disclosed by the invention are both made of the metal material, metallic annular hard sealing contact of the valve element and the valve seat is achieved, the sealing reliability is greatly improved, and the sealing property is good; moreover, due to adoption of the valve element component, on / off of an oil path from the liquid inlet to the liquid discharge hole can be controlled, large-amount overflowing can be achieved, the flow of the hard sealing safety valve is greatly increased, the axial displacement of the valve element component can be reduced due to rapid overflowing within a short time, the axial deformation of a return spring can be reduced when the axial displacement of the valve element component is reduced, and ultimately 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 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

Moreover, the sealing reliability of the existing safety valve is relatively poor, the sealing effect between the valve core and the valve seat is not ideal, and the processing accuracy of the groove for installing the seal on the surface of the valve core 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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