(1) Pressure regulating range: it refers to the adjustable range of the output pressure P2 of the pressure reducing valve, within which the specified accuracy is required. The pressure regulating range is mainly related to the stiffness of the pressure regulating spring.

(2) Pressure characteristics: it refers to the characteristics of output pressure fluctuation caused by input pressure fluctuation when the flow G is a fixed value. The smaller the output pressure fluctuation, the better the characteristics of the pressure reducing valve. The output pressure must be lower than the input pressure - the fixed value is not changed with the input pressure.

(3) Flow characteristics: it refers to the input pressure - timing, output pressure changes with the output flow G. When the flow g changes, the smaller the change of output pressure, the better. Generally, the lower the output pressure, the smaller the fluctuation with the output flow.