The butterfly valve series consists of medium type and threeeccentric butterfly valves and electric or pneumatic actuator.The electric and pneumatic actuators include requlating typeand switching type. The requlating type receives 4-20MADCcontrol signal and feeds back 4-20MADC valve positionsignal. The switching type(electric)is allocated inside with theresistance signal and optional dry contact. The switchingtype(pneumatic)can be equipped with solenoid valve, limitswitch and other accessories.