Pneumatic valve forged steel cold unique characteristics and design requirements

forged steel cryogenic pneumatic valve is mainly applied to medium in - C - - Low temperature medium in the system. Forged steel cryogenic pneumatic valve sealing gasket bolt connection coil and threaded all-welded sealed, full size or reducing, seal with a steady pressure hole ( Used for brake pneumatic valve, pneumatic ball valve) , integral seal seat, stem scaffolding, anti-static, self-centering clamp pressure shell.

and work in low temperature materials to ensure the low temperature performance, main is to ensure that the cold shock strength. Pneumatic valve internal parts must pass the correct material, make its have enough cold impact strength, to prevent rupture. C and Cr alloy steel under - ℃ when soon lose impact strength, so use temperature limit - respectively ℃ and - ℃. For Ni content. % of nickel steel can be used to - ℃, Ni content % nickel steel can be used to - ℃. Austenitic stainless steel, nickel, monel alloy, hartz alloy, titanium, aluminum alloy and bronze can be used to lower temperature ( - ℃) 。 Ming bao pneumatic valve co. , LTD. Remind cryogenic pneumatic valve gasket, also must pay attention to the material selection of packing. As the temperature is reduced, fluorine plastic shrinkage is very big, can make the sealing performance, easy to cause leakage. Asbestos packing is inevitable permeable leakage. Rubber is swelling for liquefied natural gas (LNG), cannot be used in low temperature. At low temperature in the design of pneumatic valve, on the one hand, by the structural design to ensure that the packing work is close to the ambient temperature.

forged steel cryogenic pneumatic valve design of six requirements:

, pneumatic valve should be in the medium at low temperature and ambient temperature should have the ability to work long hours.

, in order to be kept in - Use ℃ low temperature, the pneumatic valves are designed to be extended type pneumatic valve cover.

, work under low temperature of the pneumatic valve assembly does not lubrication, so you need to take structure measures, in order to prevent the friction abrasion.

and low temperature medium should not produce harmful to the hand wheel operation and packing seal performance.

and direct contact with the low temperature medium pneumatic valve assembly should have explosion and fire prevention structure.

and pneumatic valves should not be a low temperature system of a significant source of heat. This is because the heat flow in addition to the lower thermal efficiency, such as flow too much, still can make internal fluid evaporation rapidly, produce abnormal booster, dangerous.