Highlight: ·Full Vulcanized liner enhance the life circle from, prevent body from corrosion ·Low weight and short laying length saves initial cost, requires less space, and is easier to install ·Independent springs provide quick-closing, non-slam shut off for reduced water hammer potential ·Lightweight, spring-loaded discs have low cracking pressure for energy efficient operation. ·Contoured body provides a short and straight flow path with minimal turbulence.