Adjustable diaphragm pressure regulator valve is installed in high-rise buildings to the drainage system piping, the inlet pressure is reduced to a desired outlet pressure of specialty valves. The valve outlet pressure rely on its own energy to maintain stability in the set value, the outlet pressure is not due to changes in the inlet pressure and flow rate changes, and the inlet valve control system is equipped with a self-cleaning filter, the use of fluid properties, so that the proportion of larger diameter larger suspended particles will not enter the control system to ensure unimpeded circulation. so that the valve can operate safely and reliably. System quick action and long service life.