As one of the leading gear operated flange butterfly valve,Website: , flanged butterfly valves, worm gear flange butterfly valve, cast iron flange butterfly valve manufacturers and suppliers in China and equipped with a productive factory, Shanghai Hugo Valve Co.,Ltd is always at your service. Gear operated flange butterfly valve Description 1,compact and lightweight, easy for disassemble and maintenance and can be installed anywhere.  2, simple structure,and operate a small torque, 90 ° turn to open quickly.  3, the flow characteristics of linear trend, adjusting performance.  4, the use of spherical butterfly plate cylindrical shape, to improve the sealing performance and extended service life of valves, pressure head stock with more than 50,000 remain zero leakage.  5, seals can be replaced, and sealed to achieve reliable two-way seal.  6, the valve connecting flange can be designed and connected to the folder.  7, center line design Valve materials of construction Body Materials: Cast Iron, Ductile Iron, WCB , Stainless Steel  Seat Materials: NBR, EPDM, VITON Disc Materials: Ductile Iron, WCB, CF8,CF8M, Al-bronze C958 (with pin, single stem & no-pin,double stem & no pin)  Stem Materials: SS416, SS304, SS316   Applicable standard  Size Range: 2~48"(DN50~DN1200） Pressure: PN10, PN16, Class125, Class 150 Standard : ANSI,DIN,JIS  End Connection: flange Operate: Manual, worm gear, double acting & spring return pneumatic actuated and electric motorized.