This series of products are single-seat, the sleeve, two-seater, three structures; diaphragm actuators, piston two; the role of a vacuum type with a pressure regulator valve （B type） and pressure relief valve before the pressure regulator （K）. Nominal grade products are PN16, 40,64; body diameter range of DN20 ~ 300; leakage levels are level II, IV and VI grade level third gear; flow characteristics for the quick; pressure from sub-regulation 15 ~ 2500Kpa. Users may need to combine to meet the working conditions.
