Cryogenic top-entry trunnion ball valve

Cryogenic top-entry trunnion ball valve introduction
Cryogenic top-entry trunnion ball valve is suitable for medium temperature -40℃ ~ -196℃,cryogenic ball valve is called low temperature ball valve,Cryogenic top-entry trunnion ball valve is mainly used for ethylene, liquefied natural gas (LNG) plant, gas LPG, LNG storage tanks to accept base and goonhilly, air separation equipment, oil chemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide cryogenic storage tank and tank lorry, psa oxygen generating device, etc.The output of liquid low-temperature media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, not only flammable and explosive, but also in the heating to gasification, gasification, the volume expansion of hundreds of times.

Cryogenic top-entry trunnion ball valve performance
Size: 1/2 ~ 24 "(DN15 to 24"))
Pressure grade: 150~2500LB(PN16~PN420)
Connection: Flanged, welded, threaded.
Cryogenic ball valve materials: LCB, LC3, CF8.
Working temperature: -46℃, -101℃, -196℃.
Applicable medium: liquefied natural gas, ethylene, propylene, etc.
Driving mode: manual,gear, bevel gear, electric,pneumatic.

Cryogenic top-entry trunnion ball valve design feature
Cryogenic top-entry trunnion ball valve is divided into low-temperature cryogenic floating ball valve  and low-temperature cryogenic trunnion ball valve. For the temperature is higher than -50℃, the long-neck structure is generally not adopted. For the ball valve with the temperature lower than -50℃, the neck length is generally 250mm, or determined by the design and calculation of our company.Low temperature ball valve is mainly used to output liquid low temperature medium such as ethylene, liquid oxygen, liquid hydrogen, liquid nitrogen, liquid ammonia, liquid propane, liquefied natural gas, liquefied petroleum products, etc., not only flammable and explosive, and in the heating to gasification, gasification, the volume expansion of hundreds of times.
Material selection
The material of liquefied natural gas valve is very important, the material is not qualified, will cause the outer leakage or inner leakage of the shell and sealing surface;The comprehensive mechanical properties, strength and steel degree of the parts can not meet the use requirements or even fracture.Causes the liquefied natural gas medium to leak causes the explosion.Therefore, in the development, design and development of liquid natural gas valve process, material is the primary key problem.Valve body and bonnet: LCB(-46℃), LC3(-101℃), CF8 (304) (-196℃).
Low temperature treatment
Our factory to the production of low-temperature cryogenic ball valve through special low-temperature treatment, the rough machining parts in the cooling medium for several hours (2-6 hours), to release the stress, to ensure the low-temperature performance of materials, to ensure the precision machining size, in case of the valve in low-temperature working conditions, caused by temperature deformation caused by leakage.

Cryogenic top-entry trunnion ball valve main part material

No	Part name	AS to ASTM		SS to ASTM
1	Body	Type A352 LCB	Type A352 LC3	Type F304(L)	Type F304(L)
2	Bonnet	Type A352 LCB	Type A352 LC3	A182 F304(L)	A182 F304(L)
3	Bolt	A193L7	A193 3 B8	A193 B8	A193 B8M
4	Nut	A193L7	A194 8	A194 8	A194 8M
5	Seal ring/Gasket	RTFE+Cu/Nylon/1010/PPL
6	Ball	A182 F304	A182 F304（L）	A182 F304(L)	A182 F316(L)
7	Shaft	A182 F304	A182 F304（L）	A182 F304(L)	A182 F316(L)
8	Packing	RTFE+Cu/Nylon1010/PPL/Graphite
9	Gland	A105N	A351 CF8
10	Lever	A193 L7	A193 B8	A193 B8	A193 B8
11	Suitable temperature	≥-40°C	≥-101°C	≥-196°C

Cryogenic top-entry trunnion ball valve characteristics:
1. An extended bonnet to the cryogenic ball valve can make the packing gland in the valve and the actuator further away from the cold process so the valve can open and close properly, protect it from freeze-damage caused by low temperature fluid.
2. Low operating torque for smoother operations.
3. Excellent seat and seal design minimizes leakage.
4. Fire-safe design.
5. Rigid body construction minimizes thermal shrinkage.
6. By adopting different materials, the cryogenic ball valve is applicable to different working temperature and medium. The minimum temperature for the ball valve is -196ºC.