Cryogenic valve regulation with long neck cover, because: ( 1) Long neck structure is convenient for winding cold insulation materials, prevent cold energy loss. （ 2) Long neck cover has the function of protection stuffing box because of the stuffing box is one of the keys to cryogenic valve sealing. It 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 Industrial Valves stem will also move up and down because of the valve stem and pulp packing damage, cause serious leakage. So to ensure the packing made the temperature of the parts in more than 8 ℃. （ 3) Long neck structure to facilitate the valve main parts through the cover to be removed for quick replacement. The equipment often cold period of the process piping and valves installed in & other; Cold box & throughout; Long neck cover can through & other; Cold box & throughout; The wall stretched out. Replacement of Industrial Valves 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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