What is cryogenic valves and manufacturer
As the temperature of working medium drops, the material and structure of cryogenic valve, especially ultra-cryogenic valve, should be differed with regular valves. There should be some distance between the operating part and valve body, equipped with adiabatic device, to reduce the heat flux from outside. So cryogenic valves usually have a long-neck cover.
Ultra-cryogenic valves work in a more complicated condition, from outside to the ultra-low temperature, and also are functioning continuously. Contact Pressure from sealing rings guarantee the seal of closing parts. But if the gear’s force is fixed, the strength, and the materials’ performance of sealing rings, especially polymers, may vary with the temperature. Therefore, ultra-cryogenic valves require strictly on the seal rings. STL is preferred.
As for ultra-cryogenic valve, the starting speed of its closing part is fairly limited. Even though heat insulation has been applied to it, there is still heat flux in a limited scope, which leads to the liquid formation in several parts. As a result, when the valve open rapidly, the liquid will get a great speed , and once it meets an obstacle like the valve, surge will be caused, which should be noted in use.
Iron valves, whose applied temperature from -28℃ to 150℃, used to be adopted to refrigeration, using nitrogen or Freon as refrigerant , but it is now used less. The use of ferrite nodular iron remains on a positive growth instead, as a result of its great impact toughness, and corrosion-wear resistance.
The applied temperature range of WCB valves is -29℃~150℃, and the lowest applied temperature of LCB, LC1 & LC2 is -46℃~-73℃. Austenitic stainless steel (304, 316), known as a kind of low-temperature steel with good performance, can be used under -196℃, some even -254℃.
Cryogenic valve application :-
Liquefied gases LNG , such as liquid nitrogen and liquid helium, are used in many cryogenic valve applications. Liquid nitrogen is the most commonly used element in cryogenics and is purchasable around the world. Red Point Alloys considers temperatures below minus 20°C (4°F) as low temperature service and less than minus 73°C (100°F) as cryogenic service and offers an extensive range of type tested valves.
Cryogenic valves Standard :-
Designed in accordance to industrial standards like BS6364, MSS SP-134 and ISO28921-1, depending on customer requirement, service condition, material, pressure and temperature rating and other technical- or environment requirements.