The operation of a pressure reducing valve is straightforward yet effective. Typically, the valve consists of a diaphragm that responds to the changes in pressure. When the inlet pressure exceeds the set point, the diaphragm moves, causing the valve to open and allow some fluid to escape, thereby reducing the pressure downstream. Conversely, when the outlet pressure drops below the desired level, the diaphragm closes, restricting flow and allowing pressure to build up. This automatic adjustment ensures that the downstream pressure remains constant, regardless of fluctuations in the upstream pressure.