... professional butterfly Valve manufacture directly suppling:dn150 worm gear operated cast iron wafer butterfly valveFlange Drilling:Universal ... : NBR ( Buan-N), EPDM, VITON, PTFEShaft & Pin: SS410, SS416, SS304, SS316Actuator: Lever,Worm Gear, Pneumatic and Electric ... installation and maintenance.4. Minimized operating torque. Lever, gear, pneumatic and electric actuators can be chosen.5. Special ...