... WCB Disc: ductile iron, stainless steel Stem: stainless steel Sealing ring: EPDM, NBR, VITON 5.Operation Mode: Level ... electric and pneumatic. Company Profile: Tianjin Tanggu Tianshun Valve Co., Ltd., have manufactured butterfly valves for over ... valve), D343(double eccentric flanged butterfly valve), Grooved end type, Double disc wafer check valve, Resilient flapper check valve, Eccentric plug valve, ...