A Bellows Type Ultra-low Temperature Pneumatic Globe Valve

Abstract

The invention discloses a bellows type ultra-low temperature pneumatic stop valve, which comprises a valve body, a valve cover, a valve seat, a valve core, a valve stem, a bellows and a guide cylinder. Intake channel, the side wall of the valve body is provided with an outlet channel; the lower part of the valve stem is connected to the valve core, and the upper part of the valve stem extends into the inner cavity of the guide cylinder; the guide cylinder has a shoulder A, and the inner arm of the valve seat has Limiting platform; the upper end and the lower end of the bellows are respectively sealed and connected with the valve seat and the valve stem; the valve cover is provided with a control air inlet and outlet, and the control air inlet and outlet communicate with the inner cavity of the guide cylinder. The control air inlet and outlet of the present invention can be connected to the air source through the reversing valve. By passing the control air into the stop valve, the control air can enter the inner cavity of the guide cylinder to exert force on the valve stem, so that the valve core The sealing ring on the top realizes reliable contact with the sealing belt of the valve body to achieve reliable sealing of the intake passage, thereby effectively preventing the leakage of cryogenic medium.

Description

A bellows type ultra-low temperature pneumatic globe valve technical field The invention belongs to the field of valves, and more particularly, relates to a kind of ultra-low temperature pneumatic shut-off valve. Background technique With the development of technology, the transportation, storage, and use of cryogenic media such as liquid oxygen, liquid nitrogen, and liquefied natural gas (LNG) The road system is gradually becoming intelligent, and the valves required for the control switch are gradually replaced by low-temperature manual valves by low-temperature shut-off valves. The check 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. When the low temperature cut-off ...

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

Images