Bray Tri Lok®: Proven Isolation Valves for High-Pressure and High-Temperature Service The Bray Tri Lok® valve is a high-performance triple offset butterfly valve designed for extreme service applications. Its cam-like triple offset geometry eliminates rubbing between seat and seal ring, reducing wear and extending service life, while the torque-seated metal-to-metal seal ensures reliable bi-directional zero leakage shutoff.