Steam pressure reducing valves regulate the flow of media by controlling the opening of the valve body's opening and closing parts, reducing the media pressure. At the same time, with the help of the pressure after the valve, the opening of the opening and closing parts is adjusted to maintain the pressure after the valve within a certain range. This ensures that the outlet pressure remains within the set range even with fluctuating inlet pressure, protecting subsequent domestic and production equipment. Multiple pilot valves can be installed and interchanged on the same valve body to achieve temperature control, upstream pressure control, and remote on/off control while stabilizing pressure.