Suitable for medium temperature - 40℃～ - 196 ℃ of the Industrial Valves is called cryogenic valves. Cryogenic valves including low temperature ball valve, gate valve at low temperature, low temperature cut-off valve, safety valve, check valve at low temperature in low temperature, low temperature butterfly valve, needle valve at low temperature, low temperature throttle valve, cryogenic valve, etc. , 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. Output of the cryogenic liquid medium, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. , not only the flammable and explosive, and in to gasification temperature, gasification, the volume expansion of hundreds of times. The application of cryogenic valves, control the temperature, prevent the explosion, leakage etc.

typical cryogenic valves structure: commonly used cryogenic valves have low temperature gate valves, globe valves at low temperature, low temperature check valve, ball valve at low temperature, low temperature butterfly valve, etc. Low temperature gate and cryogenic ball Industrial Valves lumen between ram and a sphere, both has 'pressure relief hole'. All cryogenic valves are one-way seal, and the body cast out to the flow direction of medium or annotations.

1。 Minimum wall thickness: cryogenic valves in the valve body, valve cover broken 'minimum thickness', such as shell does not accept ASMEB16. The wall thickness and standard. 'Minimum wall thickness' gate valves shall not be less than API600, cut-off valve of the minimum wall thickness shall not be less than BS1873, check the 'minimum wall thickness shall not be less than BS1868 standards such as' minimum wall thickness '; The diameter of the stem should be accord with the requirement of API 600 or BS 1873 standard.

2。 Seat: cryogenic valves product seal according to the working temperature and nominal pressure of the medium, can design into the metal - PTFE soft seal or metal - PTFE metal hard seal, but only suitable for the working temperature is higher than medium - 73 ℃ ', because of low temperature PTFE will become fragile. Level of PTFE and should not be used for pressure is greater than or equal to CL1500, because pressure exceeds CL1500, PTFE will produce 'cold flow', affect the Industrial Valves seal. Hard seal of low temperature of gate valve, check valve, globe valve seat is Co - directly in the body Cr- W tungsten carbide. Make seat and body as a whole, to prevent leakage caused by seat deformation at low temperature, to ensure the reliability of the seal between the seat and body.

3。 Anti-static: when used for flammable and explosive medium at low temperature, if the valve packing and sealing gasket or two the insulation materials such as ptfe, valve opening and closing would produce electrostatic, and electrostatic for flammable and explosive of low temperature medium is very terrible, so, the valve should be antistatic device is designed. Body and bonnet adopts: LCB ( - 46℃) 、LC3( - 101℃) 、CF8 ( 304). ( - 196℃) 。 Ram: stainless steel welding cobalt cemented carbide. Seat: stainless steel welding cobalt cemented carbide. Stem: 0 cr18ni9. Routine inspection and test of valve: according to standard API598. Cryogenic valve inspection and test: according to JB/T7749. Drive mode: manual, bevel gear drive and electric drive. Seat: the seat structure of welding, sealing surface surfacing cobalt-based hard alloy, ensure the sealing performance of valve. Ram adopt elastic structure, in into the pressure side design pressure relief holes. One-way seal with flow mark on the valve body. Low temperature ball valve, gate valve, globe valve, butterfly valve USES the long neck structure, in order to protect the packing. Cryogenic ball valve standard: JB/T8861 - 2004.

keywords: cryogenic valves of wall thickness, seat, antistatic design and manufacturing standards
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