safety valve

Abstract

The invention discloses a safety valve which comprises a valve body, a sealing assembly and a spring assembly, and the sealing assembly and the spring assembly are installed in the valve body. The sealing assembly comprises a valve seat and a piston, a sealing seat matched with the valve seat is arranged in the valve body, the sealing seat is provided with an outer conical sealing surface, the valve seat is provided with a pit matched with the sealing seat, and the interior of the pit is provided with an inner conical surface matched with the outer conical sealing surface. According to the safety valve, condensate water and other impurities generated by moist air in the valve body at the ultralow temperature can not be deposited on the valve seat, and meanwhile the low-temperature leakage caused by low-temperature shrinkage distortion of sealing materials can be avoided.

Description

technical field

[0001] The invention relates to the field of valves, in particular to a safety valve. Background technique

[0002] According to the structural form, the safety valve can be divided into pendant type, lever type, spring type and pilot type (pulse type); according to the structure of the valve body, it can be divided into two types: closed type and non-closed type. The closed safety valve means that the discharged medium does not leak out, and all of it is discharged to the designated place along the outlet, and is generally used in toxic and corrosive media. For air and steam safety valves, non-closed safety valves are mostly used. The selection of safety valve products should be determined according to the actual sealing pressure.

[0003] For spring direct load safety valves, due to the small molecular weight of LNG, low viscosity, strong permeability, and easy leakage and diffusion, cryogenic valves are extremely important for the safe and reliable opera...

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