Anti-leakage low-temperature valve

Abstract

The invention discloses an anti-leakage low-temperature valve, comprising a main body mechanism and an anti-bursting mechanism. The main body mechanism comprises a valve body, a flange, a feeding channel, a discharging channel, a valve cover, a first connecting piece, a valve rod and a clamping ring; the feeding channel and the discharging channel are formed in the valve body; the anti-bursting mechanism is connected with the bottom of a valve plate assembly; and the anti-bursting mechanism comprises a pressure relief rod, an air inlet hole, a cavity, an exhaust hole, an exhaust channel, a pressure relief pipeline, a rubber block, a spring and a pressure relief valve. The anti-leakage low-temperature valve is provided with an anti-leakage plate, the anti-leakage plate can block a circulating medium leaked from a gap between the valve plate and the clamping ring when the valve plate shrinks and deforms when encountering cold, namely when the outer wall of the valve plate cannot make contact with the clamping ring, so that the anti-leakage effect can be achieved to a certain extent; meanwhile, a motor and a cam are arranged, the motor can drive the cam to rotate to be clamped with the clamping ring, so that the stability of the valve plate is improved conveniently, and the phenomenon that the valve plate vibrates due to too large pressure during use is prevented conveniently.

Description

technical field [0001] The invention relates to the technical field of cryogenic valves, in particular to an anti-leakage cryogenic valve. Background technique [0002] Cryogenic valves refer to valves with a medium temperature between -40°C and -196°C. Common low-temperature valves are divided into low-temperature butterfly valves, low-temperature gate valves, low-temperature ball valves, low-temperature globe valves, low-temperature check valves, low-temperature throttle valves, etc., and the output Liquid low-temperature media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, and liquefied petroleum products are not only flammable and explosive, but also gasify when the temperature rises. When gasified, the volume expands hundreds of times. Existing cryogenic valves tend to deform and shrink the valve plate due to the low temperature of the circulating medium during use, which is prone to leakage of the circulating medium. On the other hand, due to ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-leakage low-temperature valve to solve the problem that the existing low-temperature valve proposed in the above-mentioned background technology is prone to deformation and shrinkage of the valve plate due to the low temperature of the circulation medium during use, and the flow medium is easy to appear. The phenomenon of leakage, on the other hand, due to the expansion characteristics of the circulating medium, it is easy to cause excessive pressure inside the valve body, which easily leads to the problem of device rupture

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