Vacuum jacket low-temperature pneumatic emergency cut-off valve

Abstract

The invention discloses a vacuum jacket low-temperature pneumatic emergency cut-off valve, and belongs to the technical field of valves. The pressure relief valve comprises a valve body, a valve element assembly is arranged in the valve body, the valve element assembly blocks the valve body, the valve element assembly further conducts pressure relief protection on a pipeline, a transmission assembly is arranged on the upper portion of the valve body, an air cylinder assembly is arranged on the upper portion of the transmission assembly, and the transmission assembly connects the valve element assembly and the air cylinder assembly. A small valve element is installed in a large valve element, a piston spring and a valve element spring are arranged in the valve element, a vacuum clamping sleeve is arranged outside the valve element and used for heat insulation between the valve element and the outside, butt joint assemblies are arranged at the input end and the output end of the valve element correspondingly, and the butt joint assemblies are used for connection between the valve element and a pipeline system. After the valve is emergently cut off, the valve is locked through the pressure of backflow liquid, pressure relief is conducted in time when the pressure of a pipeline system reaches a dangerous range, and the pipeline system is protected.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a low-temperature pneumatic emergency shut-off valve with a vacuum jacket. Background technique [0002] Liquefied natural gas is a very common combustion raw material in daily life. In areas where the population is not densely populated, liquefied natural gas enters every household through filling and transmission. Nowadays, liquefied natural gas stations can carry out production and operation efficiently and safely. It is a special safety cut-off valve, that is, the low-temperature emergency cut-off valve. The low-temperature emergency cut-off valve is a very important valve part in the liquid filling machine. Because the working temperature of the low-temperature emergency cut-off valve is low, the outer side of the valve is often isolated by a vacuum sleeve. However, the output low-temperature liquid often vaporizes, causing the low-temperature liquid to flow back. After the e...

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Problems solved by technology

[0002] Liquefied natural gas is a very common combustion raw material in daily life. In areas where the population is not densely populated, liquefied natural gas enters every household through filling and transmission. Nowadays, liquefied natural gas stations can carry out production and operation efficiently and safely. It is a special safety cut-off valve, that is, the low-temperature emergency cut-off valve. The low-temperature emergency cut-off valve is a very important valve part in the liquid filling machine. Because the working temperature of the low-temperature emergency cut-off valve is low, the outer side of the valve is often isolated by a vacuum sleeve. However, the output low-temperature liquid often vaporizes, causing the low-temperature liquid to flow back. After the external check valve is connected in series, it cannot be insulated through the vacuum jacket at the same time. The vaporized low-temperature liquid makes the pressure of the pipeline system continue to rise, not only It increases the installation cost, and at the same time greatly weakens the protection ability of the pipeline system

[0003] When installing the valve manually, the tightness of the connection between the valve and the pipeline is judged based on the experience of the workers, but there is a sensory error in the manual judgment, which often leads to tooth shape damage caused by too tight rotation of the connecting bolts, or insufficient pressure on the butt joint surface. Uniform, can not guarantee the accuracy of the seal

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