The pressure reducing valve group is suitable for the steam and air compression system of ships, as a device for adjusting the pressure of the pipeline medium. It is generally composed of adjustable pressure reducing valve, pressure gauge, globe valve, globe check valve, Y-type filter, pressure gauge valve, safety valve and seamless steel pipe and other pipeline accessories. The nominal diameter is DN15~DN100, and the nominal pressure is 0.6MPa~4.0MPa. After adjustment, the outlet pressure can be adjusted to 0.2~2..5MPa.