The ZZMP Self-Operated Steam Pressure Regulating Valve,It’s no need an external power supply or air source, and uses the pressure of the medium of the controlled pipeline as a power source to control the position of the valve spool,  so as to change the pressure difference and flow at both ends, to achieve the purpose of controlling the pressure stability at outlet side (B-Modle) or pressure relief at inlet side (K-Modle). It has the advantages of quick response, good sealing performance, small pressure fluctuation, etc., Widely used in various industrial pipeline for gas, liquid and steam media pressure relief (pressure reduction) automatic control.