Cryogenic valves are intended for very cold applications. The term "cryogenic" refers to temperatures below -50゜C.

Valve materials for cryogenic service are required for good ductility. Sealing parts, gaskets and other fittings should also be adapted to these extremely cold conditions on demand.

Industries associated with liquefied and compressed natural gas, as well as liquid oxygen, nitrogen or helium, rely on these special valves for the frequent, safe and reliable transport of cryogenic liquids and gases.

Special Cleaning Needs & Concerns To Be Stressed

The valve manufacturers are required to remove grease and all organic contaminants from the valve with a special solvent, keeping the valve clean. Ultrasonic cleaning is a common choice.

Some cleaning gases such as oxygen or chlorine require a very high level of cleanliness to ensure that no organic material or fiber breaks remain on the valve after the cleaning. The cleaned and certified valves are placed in double-sealed polyethylene bags to ensure that the valves are stored in a clean environment until they are installed and used.

Operators should perform a thorough inspection when installing cryogenic valves. This is critical to ensure that no lubricants or grease are accidentally introduced into the valve. Some specialty lubricants are available for use in cryogenic environments, and whether or not they are allowed should depend on the specific application requirements.

As mentioned earlier, cryogenic valves must avoid staining with fiber breaks. As a general rule, fibers longer than 1/8 inch are not allowed in the valve. In many cases, fibers or breaks of any length are not allowed in the valve.

Finally, inspectors should regularly check cryogenic valves and oxygen systems to see if there are internal or external leaks. Internal valve leaks can be prevented by installing the valve properly and a reliable seal design. Cryogenic service requires robust and stable seals to ensure long-lasting and reliable operation of the equipment.

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