The RP must be installed 12" above grade with adequate drainage. If the RP is installed indoors, it must have an air gap drain for the relief valve that connects to a floor drain.When Inspecting the RP with a set of Differential Pressure Gauges, we are looking for the first check to hold above 5.0, the relief valve to open above 2.0, and the second check to hold tight.
The Double Check Valve Assembly can be installed below grade. If installed below grade it must have adequate drainage. The Double Check Valve looks a little bit like the RP, but does not have a relief vlave. It is low hazard.When testing the Double Check Valve Assembly with Differential Pressure Gauges, we are looking for both check valves to hold tight at above 1.0
The Pressure Vacuum Breaker must be installed 12" above the tallest head or piping. This device must be tested upon installation or repair, and annually.When testing the PVB with Differential Pressure Gauges, we are looking for the air inlet to open above 1 lb of Pressure. The Check valve must hold above 1 Lb of Pressure.
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