Proportional pressure reducing valve works: Under the action of the inlet pressure P1, the floating piston is pushed open and the medium passes. Due to the cross-sectional area of ​​the piston at both ends of the pressure difference caused by changes in the pressure after the valve, that is, the pressure in the pipeline case, the ratio of the area of ​​the piston at both ends of the valve before and after the composition of the pressure ratio. No matter how the pressure changes before the valve, the static pressure and dynamic pressure after the valve can be reduced to the corresponding pressure value.