First, an overview of low temperature valve

There are two kinds of low-temperature valve cover design. The first is a bolt-type bonnet, according to this design of the valve, the valve body and the valve cap bolts and nuts, wound gasket (316 clip flexible graphite). Customers can also use special metal ring connection. The second design is welded bonnet, according to this design of the valve, the valve body and the valve cap screwed, all-welded seal. Customers have special requirements can also be used when welding penetration.
 

Second, low temperature valve technical requirements

 1, the design, manufacture and acceptance according to JB / T 7749-95 
 2, the main material: LCB, LF1, LF3, LC3, CF8, F304, etc. 
 3, the structure length according to GB / T 12221-1989 standard 
 4, JB / T 79-1994 standard 
 5, temperature: -46 ~ 196 ° C  
 6, the valve test and test according to JB / T 9092-1999 standard
 

Third, the main components of low temperature valve material

 1, valve body, bonnet: stainless steel 
 2, stem: 1Cr18Ni9Ti 
 3, gate, valve seat sealing surface: surfacing carbide 
 4, stem nut: aluminum bronze 
 5, gaskets: asbestos, wax asbestos rubber Plate 
 6, packing: flexible graphite, PTFE, PTFE asbestos roving 
 7, hand wheel: ductile iron or steel forging
 

Fourth, the main specifications size