Tyco manufactures high pressure butterfly valves that offer zero leakage, accurate control of the medium, and are available in resilient or metal seat. Their K-Lok metal seat, firesafe butterfly valves are pressure rated up to ANSI cl. 1500, temperature rated from -253 to 815°C, and come in sizes up to 1800mm. Their Zero Leakage Quarter Turn high pressure butterfly valve is designed for abrasive services and extreme temperatures with pressure ratings of ANSI 150 to ANSI 900, temperature rated from -253 to 816°C, and come in sizes of 80 to 2100mm.