Cryogenic valves refer to stainless steel globe valves, pressure reducing valves, check valves, and ball valves designed for temperatures between -40°C and 196°C. They are primarily used in ethylene and liquefied natural gas (LNG) plants, LPG and LNG storage tanks, receiving bases and satellite stations, air separation plants, petrochemical off-gas separation equipment, cryogenic storage tanks and tank trucks for liquid oxygen, liquid nitrogen, liquid argon, and carbon dioxide, and pressure swing adsorption oxygen generators.
Extension rod functions:
1. Prevent freezing. Liquid media can freeze easily in low-temperature environments. If the valve comes into direct contact with the media, internal components may be damaged by freezing. Extension rods increase the distance between the valve and the media, reducing the likelihood of freezing.
2. In cryogenic pipelines, which are covered with a thick insulation layer, the extended rod bonnet design facilitates insulation installation and positions the packing gland outside the insulation layer, facilitating ready tightening of the gland bolts when needed and eliminating the need to break the insulation layer when adding packing.
3. Reduce heat loss. Heat loss is rapid in low-temperature environments, and direct contact with valve operating components can cause frostbite to hands. Extension rods effectively isolate operators from low-temperature environments, reducing heat loss.
4. Reduce valve load pressure. In some cases, valves must withstand high pressure. Extension rods can distribute the pressure on the valve, reducing the load and extending its service life.
5. Improve operational safety: In low-temperature environments, operators need to wear heavy cold-weather clothing, which may affect operational accuracy and dexterity. Extension rods allow operators to maintain a safe distance while operating, improving operational safety.