As is known to all, suitable for medium temperature - 40℃～- 196 ℃ valve called cryogenic valves, and this kind of valve is generally USES the long neck cover. Cryogenic valves with long neck cover regulation of cryogenic valves, including emergency cut-off valve at low temperature, low temperature cut-off valve, check valve in low temperature, special LNG cryogenic valve, NG for cryogenic valve, etc. , mainly for the three hundred thousand tons of ethylene, such as liquefied natural gas chemical industry device. Output of the cryogenic liquid medium, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. , not only the flammable and explosive, and in to gasification temperature, gasification, the volume expansion of hundreds of times. Cryogenic valves with long neck cover because: ( 1) Long neck cover has the function of protection cryogenic valves stuffing box because of the stuffing box is one of the keys to cryogenic valve sealing. The stuffing box if leakage, will reduce the cooling effect, lead to liquefied gas gasification. Under low temperature condition with lower temperature, packing elastic gradually disappear, leakproof performance drops, caused by leakage of medium ice packing and the valve stem, affect the normal operation the valve stem will also move up and down because of the Industrial Valves stem and pulp packing damage, cause serious leakage. So to ensure the packing made the temperature of the parts in more than 8 ℃. ( 2) Long neck cover structure is convenient for winding insulating material, can prevent cryogenic valves cold damage. ( 3) Cryogenic valve long neck structure to facilitate the valve main parts by the cover to be removed for quick replacement. The equipment often cold period of the process piping and valves installed in the 'cold box, long neck cover can cross the cold box wall stretched out. Replacement of valve is the main thing, only the cover for conversion, without having to remove the body. The valve and pipe welding as a body, as much as possible to reduce the leakage of the cold box, ensure the sealing of the valve.
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