... disk: Forging or Casting Zhengyu Sanitary Flange Butterfly Valve with clamp and flange1 .Material :SS304 ... machine ,high polished,Ra less than 0.6μm.Material:304,304L,316,316LWorking principle: remote- ... for butterfly valve,clamp butterfly valvewelded butterfly valvemale-weld butterfly valveQuick-install butterfly valvesampling valvecheck valvemale butterfly valvethree piece flange butterfly ...