The RAF 20 is applicable, with slightly different layout and switching, for either vertical [deep well} or horizontal [booster] pumps.
ln both configurations, the RAF 20 is connected electrically to the pump’s control panel. For booster pumps control the RAF 20 is installed on the main line downstream of the pump. Generally the valve protects the booster pump and its engine by sustaining the pressure in starting and shutoff, and function as a check valve otherwise. The valve protects the pump in case of power shutdown by sustaining the pressure downstream the pump.
ln deep well configurations, the RAF 20 is installed on a tee branch off the main line. lt functions basically as a pressure relief. Letting a low pressure in starting and shut-off, and closes other wise to enable a gradual pressure buildup. In case of emergency shutdown, the RAF 20 opens to relieve pressure from the vertical pump.
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