... professional butterfly Valve manufacture directly suppling:dn150 worm gear operated cast iron wafer butterfly valveFlange Drilling:Universal ... & Pin: SS410, SS416, SS304, SS316Actuator: Lever,Worm Gear, Pneumatic and Electric ActuatorProduct characters:1. Rubber backed seat with ... flow rate and low flow resistance.6. Suitable medium: water, sewage, sea water, air, steam, food, medicament, oils, acids, ...