Cryogenic Ball Valve Trunnion Mounted Extend Stem for -196 °C Service

Product Description

ARAN manufacture high performance cryogenic ball valves ranges of different international standards.The trunnion mounted ball valve( TM ball valve) is used for bigger size and higher pressure class,the valve is split body 2 or 3pcs, the material can be forged steel or cast steel,lever and gear operated or actuator type of electric, pneumatic, hydraulic and gas over oil.

● Production Range Cryogenic ball valves low temperature to -196 ℃

● Size NPS 1/2"~24" (50mm~600mm)

● Pressure ASME Class150~1500LBS (PN16~PN250)

● Design& MFG code BS6364/ SHELL SPE 770200

● Test & Inspection ISO 15848/SHELL SPE 77/312 Low temperature leakage test ,API 598, API 6D,ISO5208/ISO 5208/EN12266/GOST 9544

● Low Temperature Carbon Steel -40~0℃ (ASTM A350 LF2/LF3, ASTM A352 LCB/LCC)

● Austenitic Stainless steel -100~-40℃ (ASTM A182 F316/F316L/F304/F304L DUAL GRADE, ASTM A351 CF8M/CF3M,CF8/CF3)

● Austenitic Stainless steel -196~-100℃ (ASTM A182 F316/F316L/F304/F304L DUAL GRADE, ASTM A351 CF8M/CF3M,CF8/CF3)

● Packing and gasket material suitable for low temperature

● Double Block and Bleed Design (DBB)

● Metal Seated or Soft Seated

● Double piston effect downstream & upstream – DIB I

● Double piston effect downstream & single piston effect upstream – DIB II Seat sealing injection

● Sealing material choose PCTFE -200℃~130℃

● All metal parts in contact with low temperature medium need to be cryogenic treated with liquid nitrogen at -196 C degrees before finishing, and the treatment time is normally maintained for 2-3 hours.

● The cryogenic valves designed with extended stem and water drip pallet in stem.The drip pallet can prevent the water vapor in the air from liquefying and then water flows to the valve surface and freezing, causing valve damage.They are applied to ensure the sealing performance of packing box and normal operation of ball valves . It also reduces the heat transferred from the outside to the inside of the device.

● Extend stem calculation according to SHELL SPE77/200/BS6364. The extend stem which is related to the thermal conductivity of the material, the thermal conductivity area, the surface heat dissipation coefficient and the heat dissipation area. The extend stem allows enough space for insulation material and ensures the stem packing sound sealed above 0℃. Normally less lower than 50℃ will need extend stem.

● Body Relief Structure. The LGN gasification generates a high pressure in the valve body, it destroys the ball and valve seat components, so one-way valve is added at the inlet end of the ball to ensure the pressure balance between the cavity and the inlet pipeline and prevent the cavity from abnormally boosting pressure.

● cryogenic valves low fugitive emission test upon order request