SS316L VIM-VAR MELTED Material is for ultrpurity applications. Internally electro-polished finish with a surtace roughness of up to Ra 5 μin Cut off volume samllized to intercepting Purge and blow flexible, and high flow traffic gurantee Provide Diaphragm spring made from Hastalloy C-22 and UNS R30003 Corrosion Resistance and high strensile The fully enclosed valve seat design has the following advantages Excellent anti-expansion and anti-pollution ability Improved helium leak test performance Rarely produces particles ,long service life Suitable assemble and pack for the semiconductor industry that requires ultra-high purity. Every product undergoes helium leak test before being released to market. High pressure valves ensure optimal performance and safety under extreme conditions.