GA Industries Figures 4700-D and 4700-U self-contained, pilot-operated, differential piston actuated pressure reducing and sustaining valves reduce a higher, fluctuating inlet pressure to a lower, steady downstream pressure regardless of variations in demand, providing the inlet pressure is above a pre-determined minimum.
Should the inlet pressure fall to the minimum, the sustaining function will override the reducing function and throttle as needed to sustain the minimum inlet pressure. The valve will close if the inlet pressure falls below the minimum.
The valve's unique V-port trim provides a semi-linear flow characteristic for excellent control during periods of minimum demand plus full port capacity to handle peak demand such as fire flow.
The main valve can be supplied with an OPTIONAL "stop-check" piston to prevent return flow should the inlet pressure fall below the outlet pressure.
GA Figure 4500:
Pressure Reducing Valve, Flanged, Piston-Operated
GA Figure 4700:
Pressure Reducing & Sustaining Valve, Flanged, Piston Operated
GA Figure 4900:
Pressure Reducing & Check Valve, Flanged, Piston Operated
GA Figure 5450:
Pressure Reducing Valve, Series 5000 Diaphragm Operated
GA Figure 5470:
Pressure Reducing and Sustaining Valve, Series 5000 Diaphragm Operated
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From the raw water intake to the filtration plant to the finished waster distribution and storage system, GA Industries valves have been providing dependable service in large and small water systems. GA Industries pump control, check and relief valves mitigate damaging pressure surges and eliminate slam and bang that can result from the operation of water pumps.
Our full range of pilot operated control valves regulate distribution system pressure and prevent overflow of storage tanks and reservoirs. Air trapped in water pipelines can reduce system efficiency and exacerbate pressure surges. Our wide range of automatic air valves ensures we have the right valve to maintain an air free system.
And when it’s necessary to isolate a pump, process or section of pipeline, you can depend on GA Industries butterfly valves for reliable flow shutoff.