YX741X Diaphragm-Type Adjustable Pressure Reducing and Sustaining Valve The diaphragm-type adjustable pressure reducing and sustaining valve is a special valve installed in the water supply pipelines of high-rise buildings, which reduces the inlet pressure to a required outlet pressure. The valve relies on its own energy to keep the outlet pressure stable at the set value, i.e., the outlet pressure does not change with variations in inlet pressure or flow rate. A self-cleaning filter screen is i