Double offset metal seat high performance butterfly valves to suit API standards class 150 Rating

■Features and Benefits
●Designed as an inherently fire safe metal seated butterfly valve. Certified to Fire Safe Test as per API 607 4th Edition.
●Seals flow in both directions. The valves can be used even if the flow changes direction.
●These designs successfully reduce thermal expansion and provide a constant sealing performance against any change in temperature or pressure of the fluid.
●The axis of disc rotation is double offset to the seat ring. When the disc rotates, it unseats at a small turning angle by its cam effect. This prevents seat wear and provides reliable sealing performance over long periods.
●The resilient metal seat ring with coil spring compensates for thermal expansion or contraction of the body or disc. The ball lock method is adopted to facilitate replacement of the seat ring.
●By minimising the effect of friction and the special hard facing of the seating, the reliability of this metal seat butterfly valve is dramatically improved. The key connection of the disc and stem will prevent the direct effect of heat transaction from the stem to the disc as well as provide an anti-blow-out facility on the stem.