API6D Standard Cryogenic Valve
CRYOGENIC BALL VALVE, CRYOGENIC GATE VALVE, CRYOGENIC GLOBE VALVE, CRYOGENIC CHECK VALVE 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. Application: Air separation plants, LNG storage and distribution, LNG Transportation, Liquid and Gaseous Oxygen for steel production, Etc. Pressure Range: 150LB ~ 2500LB, PN10~PN64 Temperature Range: -196 Deg C Material: Austenitic
CRYOGENIC BALL VALVE, CRYOGENIC GATE VALVE, CRYOGENIC GLOBE VALVE, CRYOGENIC CHECK VALVE
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.
Application: Air separation plants, LNG storage and distribution, LNG Transportation, Liquid and Gaseous Oxygen for steel production, Etc.
Pressure Range: 150LB ~ 2500LB, PN10~PN64
Temperature Range: -196 Deg C
Material: Austenitic Stainless steel, ASTM A351, ASTM A182, Etc.
End Connections: RF, RTJ. FF, Butt Welded, Extended Butt Welded, Etc.
Standards: API 6D, API 607 for fire safe design, API600 / API603 for Gate valve, BS 1873, BS1868, Etc.
Operation: Lever / Handwheel, or gear operated, Pneumatic or Electric Actuated. Etc.
| Ball Valve Type | Design and Manufacture | Face to Face/End to End | Flange Dimensions | Pressure Temperature Rating | Inspection and Test |
| Split Flange ball valve | BS5351 | ANSI B16.10 | ANSI B16.5 | ANSI B16.34 | API6D |
| Fixed flange ball valve | API6D/API608 | API6D | ANSI B16.47 | ANSI B16.34 | API598 |
Main Material
| Body material | Trim material | Seal material | Gasket/Packing |
| CF8/CF8M/CF3/CF3M,ETC. | SS304, SS316,ETC | PCTFE, ETC. | GRAPHITE.PCTFE, ETC. |
Cryogenic Definition:
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.
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.
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.
Cryogenic method: soak the parts to be processed into liquid nitrogen tank for cooling, when parts of 196 degrees centigrade temperature reaches-, start insulation 1 ~ 2 hours, then remove the carton natural treatment to room temperature, repeat cycle twice.
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