There are two types of water pressure reducing valves, direct acting and pilot operated; both of which use globe or angle style bodies, with new developments available in an Axial flow configuration. Valves used on smaller piping diameter units are normally cast from brass; while larger piping diameter units are made from ductile iron or steel. Direct acting valves, the more popular type of water pressure reducing valves, consist of globe-type bodies with a spring-loaded, heat-resistant diaphragm, which is connected to the outlet of the valve (which acts upon a spring). This spring holds a pre-set tension on the valve seat installed with a pressure equalizing mechanism for precise water pressure control.
Installed in series directly after the water meter in homes, commercial buildings, and manufacturing plants, a water pressure reducing valve automatically reduces the pressure from the water supply main to a lower, more sensible pressure.
Water entering the system is constricted within the valve body and directed through the inner chamber, controlled by an adjustable spring-loaded diaphragm and disc. Even if the supply water pressure fluctuates, the pressure reducing valve ensures a constant flow of water pressure, as long as the supply pressure does not drop below the valve’s pre-set pressure.
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