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Cryogenic valves are designated as those valves that are designed for use in applications below -150 deg C. Commonly used gases such as Oxygen, Helium, Hydrogen, Nitrogen and LNG are compressed for ease of transportation and storage. This compression forces the temperature to drop to what is known as cryogenic temperatures.
They are easily identified externally as they have a much longer stem than a normal valve to extend the distance between the packing material and the cold product. Typical designs include: