Overview of cryogenic valves

The valve suitable for medium temperature -40℃~ -196℃ is called cryogenic valve. Mainly used in ethylene, liquefied natural gas plants, natural gas LPG LNG storage tanks, receiving bases and satellite stations, air separation equipment, petrochemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide cryogenic storage tanks and tank trucks, pressure transformation On devices such as adsorbing oxygen. The output liquid cryogenic medium, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., is not only inflammable and explosive, but also vaporizes when the temperature rises, and the volume expands hundreds of times when it is vaporized.

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Material analysis, PMI Material analysis. Chemical analysis. Low temperature test, Tensile Test ,Impact test, Hardness test. Wall thickness test, roughness test. Torque test. NDT Inspection (MT,PT,UT,RT). HIC test ,SSC test . Intercrystalline corrosion Test ,Uniform corrosion Test.

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We are one of the member unit of China Valve Association as well as China Gas Association, member unit of first class supplying network of CNPC and member unit of fittings supplying network of State Power Corporation.

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The structure design of the drip plate of the cryogenic valve

Since the transmission in the valve is a low-temperature medium, in order to avoid or reduce the transmission of medium temperature to the valve stem and the filling material at the upper end, and prevent these materials from failing due to freezing, a drip plate structure can be added to the valve.

Cryogenic valve material selection:

1. The valve body and bonnet adopt: LCB (-46℃), LC3 (-101℃), CF8 (304) (-196℃).
2. Ram: stainless steel surfacing cobalt-based cemented carbide.
3. Valve seat: stainless steel surfacing cobalt-based cemented carbide.
4. Stem: 0Cr18Ni9.

Installation requirements for cryogenic valve

Because of the special structure of the cryogenic valve, the installation of the cryogenic valve also has its special requirements. Because of the structural characteristics of the long-neck bonnet of the cryogenic valve, the direction of the stem of the cryogenic valve must be within a vertical angle of 45 degrees during installation, and installation on vertical pipelines should be avoided as much as possible. Otherwise, the low temperature medium will fill the extended part of the valve cover, causing the valve packing to fail, and will transfer the cold to the valve handle, causing personal injury to the operator. For cryogenic valves with pressure relief structure, when installing the valve, pay special attention to the requirements of the valve pressure relief direction.

The structure design of the valve cover of the cryogenic valve

The design of the extended bonnet structure is mainly to keep the valve operating handle and stuffing box structure away from the low temperature area, which can not only avoid the frostbite of the operator due to too low temperature, but also ensure that the stuffing box and compression sleeve are used at normal temperature to prevent the packing from being damaged. The sealing performance is reduced and the service life of the packing is prolonged.

Frequently Asked Question

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The main reason for the internal leakage of the valve is the deformation of the sealing pair in the low temperature state. When the temperature of the medium drops to a phase change of the material, the volume changes, and the sealing surface with high grinding accuracy is warped and deformed, resulting in poor low-temperature sealing.

Valve leakage: First, when the valve and the pipeline are connected by flanges, leakage occurs due to the unsynchronized contraction of gaskets, connecting bolts, and connecting parts at low temperatures. Therefore, the connection method between the valve body and the pipeline can be changed from flange connection to welding structure to avoid low temperature leakage. The second is leakage at the valve stem and packing.

This is because the plasticity and sealing of the low temperature valve packing will become worse as the temperature drops, leakage and icing will occur at the packing, which will affect the low cooling capacity loss, and the valve cover must adopt a long neck structure. The cross-sectional area of the long neck portion should be small, generally cylindrical, and the gap between the inner wall and the valve stem should also be small. In order to reduce the cold transfer upwards. The length of the neck is related to temperature and caliber. The lower the temperature and the larger the caliber, the longer the length.

It must be on the high pressure side. The purpose is to maintain the pressure balance between the upstream and the valve ball flow passage cavity when the ball valve is closed, to prevent the cryogenic liquid in the ball valve cavity from instantaneous vaporization and expansion, causing the valve body to burst.

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