The Bray Tri Lok Triple Offset Butterfly Valve is well suited for operation in vacuum to high pressure as well as cryogenic to high temperature applications. The standard, non-rubbing, metal-to-metal sealing system is inherently firesafe. Applications requiring absolute zero leakage are ideally suited for triple offset technology. Pressure rating: ASME Class 150, 300, 600, 900 at -320°F to 842°F (-196°C to 450°C).