1.Max. working pressure up to 4500psig (310bar) 2.Metal seal metal sealing, providing no leakage services in the vacuum to high pressure range. 3.The internal volume is small, which can be completely blowing the runner. 4.The design of the full wrapping valve seat has superior anti -expansion and anti -pollution ability. 5.Nickel cobalt alloy film, has higher durability and corrosion resistance. 6.The standard rough is RA0.25 μm (BA), or electrolyte polishing RA0.13μm(EP) optional. 7.The leakage rate of the qi test <1 × 1 0-9 s t d d c m 3 / s 8.Pneumatic actuator is Optional. 9.The life span