Maintains constant pre-set inlet pressure for use in conjunction with the Williams “High Head” Through/Around The Pump (or comparable) foam systems. Allows any firewater pump to produce suction side foam at virtually ANY positive inlet pressure. As such, the WPRV eliminates need for operator intervention to adjust intake gate valves due to suction pressure fluctuations as a result of changes in pump discharge flow. Thus, the added burden of assuring a maximum pump intake pressure (based on pump discharge pressure) associated with traditional suction side foam systems simply goes away.
Got a CAFS or Balanced Pressure system? The WPRV can provide reduced pump inlet pressures to allow increased engine/PTO speed to maintain higher compressor or foam pump output when operating with positive pump inlet pressures. Installed within a discharge line, the WPRV maintains a preset pressure for hand lines or ground monitors independent of higher pump discharge pressures.
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