... Silicon, EPDM, Viton , NBR, FPM, which all confirm to standard of FDA. Connection: Weld, clamp, thread, single weld single thread, flange ... for food, beverage, brewage, dairy, pharmacy and chemical industry area. Operating Principle: It can be either remote-controlled by an actuator or ... and air/air activated (A/A). The actuator push piston of axial movement into 90 degree so that it controls butterfly ...