Cryogenic valve such as Cast Iron Gate Valve refers to the valve can be used  for low temperature conditions, usually the valve will be regarded as cryogenic  valve when the operating temperature will be lower than -40 degrees c cryogenic  valve is usually used for oil and gas, air separation, natural gas industry,  etc., if it can work the quality determines the safety, economy, continue. With  the development of modern technology, the demand for cryogenic valves is  increasing and the range of use is increasing.

For temperatures above -50 degrees, do not use extended stem generally, for  temperatures below -50 degrees, the length of the extended stem depends on the  specific temperature. Cryogenic valve is mainly used for transmission like  ethylene cryogenic medium, liquid oxygen and liquid hydrogen, liquefied natural  gas, liquefied petroleum, etc., not only easy to explode, flammable, but also  become a gas in the temperature, gasification, volume will expand hundreds of  times.

Cast Iron Gate Valve Manufacturer thinks the low temperature valve material  is very important, if not correct, will lead to the valve body shell and sealing  surface inside and outside leakage, parts of the comprehensive mechanical  ability, strength and hardness is not qualified, will cause fracture. If the  liquefied natural gas leaks, it will explode. Therefore, material is the main  problem in the design and manufacture of LNG valves. The valve body and bonnet  consist of LCB (-46 Deg C), LC3 (-101 Deg C), CF8 (SS304) (-196 Deg C).

Long stem cryogenic valve designed to reduce heat from outside into the  valve; And ensure that the packing gland temperature above 0 degrees Celsius,  ensure that the packing is not affected; Finally, it prevents the stem and parts  above the bonnet from freezing or frosting as packing temperatures drop.