At their core, pressure reducing regulators operate on the principle of controlling the flow of fluids through a system. They accomplish this by utilizing a mechanism that adjusts the valve position based on the output pressure readings. Typically, a diaphragm is employed, which responds to the changes in output pressure. When the output pressure drops below a set threshold, the diaphragm moves to open the valve, allowing more fluid to flow through and thus increasing the pressure. Conversely, if the output pressure rises above the desired level, the diaphragm closes the valve to reduce flow and bring the pressure back within acceptable limits.