An ultra-low temperature electromagnetic pneumatic globe valve

Abstract

The invention discloses an ultra-low temperature electromagnetic pneumatic shut-off valve, comprising a valve body, a valve stem, a valve seat, a cylinder and an electromagnetic reversing valve. As an outlet channel; a sealing ring is installed on the lower end of the valve stem, a sealing band is arranged on the valve body at the outlet end of the intake channel, the cylinder has a cylinder body and a piston assembly, and the upper end of the valve stem penetrates from the lower end of the cylinder body into the cylinder body and The piston assembly is fixedly connected, and the piston assembly divides the inner cavity of the cylinder into a sealing chamber I and a sealing chamber II located below the sealing chamber I, and the sealing chamber I and the sealing chamber II are respectively connected with the electromagnetic reversing valve; the electromagnetic reversing valve It is used to supply air to the sealing chamber I or the sealing chamber II, thereby driving the piston assembly and the valve stem to move up and down to open or close the stop valve. The invention has the advantages of compact structure, small volume and high reliability, and is suitable for transportation, storage and pipeline use of cryogenic media such as liquid oxygen, liquid nitrogen and liquefied natural gas (LNG).

Description

technical field [0001] The invention belongs to the field of valves, and more particularly, relates to an ultra-low temperature electromagnetic pneumatic shut-off valve. Background technique [0002] With the development of technology, the pipeline system for transportation, storage, and use of cryogenic media such as liquid oxygen, liquid nitrogen, and liquefied natural gas (LNG) has gradually become intelligent, and the valves required for control switches are gradually replaced by low-temperature manual valves by low-temperature globe valves. , Low temperature globe valve is usually used in the working environment where the temperature is lower than -40 ℃, such as: petrochemical, air separation, natural gas and other industries. Therefore, the low temperature globe valve needs to achieve the effect of long working time and good sealing performance under the temperature suitable for the surrounding environment. [0003] When the cryogenic globe valve is under pressure and...

AI Technical Summary

Problems solved by technology

Therefore, leakage incidents occur from time to time when the cryogenic medium storage and transportation tank truck is running, especially the valves arranged in the operation box are high-risk parts of the cryogenic medium storage and transportation tank truck. If the sealing performance is not good, it will There is a great risk in the storage and transportation of cryogenic medium

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