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The long neck valve cover low-temperature gate valves
Cryogenic valves are suitable for medium temperature - ℃ ~ 196 ℃ valve, low temperature gate valve, globe valve, ball valve low temperature low temperature such as cryogenic valves use long neck valve cover.
Industrial cryogenic valves including low temperature emergency cut-off valve, low temperature cut-off valve, low temperature check valve, LNG special cryogenic valve, LNG special cryogenic valve is mainly used for three hundred thousand tons of ethylene, liquefied natural gas chemical device. The 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 warms up to gasification, gasification, volume expansion hundreds of times.
Cryogenic valve under the long neck valve cover because:
(1) long neck valve cover with the protection of the cryogenic valves gland function, because gland sealing is one of the keys to cryogenic valve. This gland place if leakage, will reduce the cold insulation effect, resulting in liquefied gas gasification. In the low temperature condition with lower temperature, packing elastic gradually disappear, leakage-proof performance fall subsequently, due to the medium leakage caused by packing and stem place ice, influence the normal operation of valve stem for stem will also move up and down and pulp packing scratches, cause serious leakage. So to ensure the packing whose parts of the temperature in 8 ℃ above.
(2) the long neck valve cover design allows for easy winding cold insulation materials, prevent cryogenic valves cold energy loss.
(3) cryogenic valve long neck structure for main parts of the valve by valve cover dismounting rapid change. Due to the equipment cold segment of the process piping and valves often installed in 'frige', long neck valve cover can through the 'frige' wall stretched out. Major parts of the valve replacement, only through the valve cover for conversion, and does not need to remove the body. The body and pipe welding together, as far as possible to reduce the leakage of the cold box, to ensure the sealing of the valve.
