Cryogenic Ball Valve -198 Deg C,Cryogenic Trunnion Type Ball Valve
Temperature Range: -198 Deg C
Operation: Lever / Handwheel, or gear operated, Pneumatic or Electric Actuated. Etc.
Material: Austenitic Stainless steel, ASTM A351, ASTM A182, Etc.
Standards: API 6D, API 607 for fire safe design, API600 / API603 for Gate valve, BS 1873, BS1868, Etc.
End Connections: RF, RTJ. FF, Butt Welded, Extended Butt Welded, Etc.
Application: Air separation plants, LNG storage and distribution, LNG Transportation, Liquid and Gaseous Oxygen for steel production, Etc.
Technical Summary
Szie Range: 1/4"~24"(DN6~DN600)
Series in Range: Standard bore, reduced bore; Ball valve, Gate valve, Check Valve, Globe valve, Etc.
Pressure Range: 150LB ~ 2500LB, PN10~PN64
Cryogenic Definition:
As a general rule, use of the valve below 101C, before finishing the main part for cryogenic. But if the user requires, above-101.C working temperature valve parts for cryogenic.
Low-temperature parts into liquid nitrogen tank insulation a certain length of time, to reduce its due to temperature differences andmetallographic changes resulting from the deformation,which increases when the low-temperature valve sealing performance of a processing method.
Cryogenic method: soak the parts to be processed into liquid nitrogen tank for cooling, when parts of 198 degrees centigrade temperature reaches-, start insulation 1 ~ 2 hours, then remove the carton natural treatment to room temperature, repeat cycle twice.
Austenitic stainless steel in Martensitic transition temperature, part of austenite into martensite changes causing the resulting volume parts deformation is an important reason for the valve sealing surface leakage. Moreover, as the temperature decreases parts produces shrink and thermal stress caused by the valve irregular parts of deformation caused by low leakage is also one of the reasons. To this end, before finishing of parts (e.g. sealing surface grinding) on main parts such as: the valve body, valve covers, plate (disc), the valve stem fasteners such as below the operating temperature of cryogenic treatment.
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