This valve is applicable to steam pipelines with operating temperature ≤200°C and 350°C, and the inlet pressure can be reduced to a certain required outlet pressure through regulation. When the inlet pressure and flow change, the outlet pressure can be automatically kept within a certain range by the energy of the medium itself, but the difference between the inlet pressure and the outlet pressure must be ≥0.2MPa, and a Y-type filter must be installed in front of the valve.