ZHD series (electric/pneumatic) minimum flow control valve adopts multi-stage cage symmetrical small hole sleeve into flow channel regulating valve, completely controls the flow rate of the medium flowing through the valve, greatly reduces the noise generated by high-pressure gas or steam in the valve, stable multi-level pressure reduction effectively makes the liquid will not produce cavitation, is used in high-pressure medium places stable performance control valve, can choose multi-spring pneumatic membrane mechanism or electric actuator, etc.