PRINCIPLE OF OPERATION

In its normal mode of operation, a Q-VAC Priming System operates automatically to establish and maintain a prime on all the pumps connected to it.  This is accomplished by piping a vacuum line from the Q-VAC system to a priming valve installed in the suction piping and housing of each pump.  The differential pressure created by the vacuum priming system draws water up the suction line, lifting it into the pump.   As air is removed and the vacuum level increases, the water level will rise until the pump is fully flooded and the float actuated priming valve closes.   Should the water level drop at any time the priming valve will immediately open and vacuum within the air receiver will restore the water level to its fully primed state.   It is important to note that during automatic operation the priming system operates independently from the pumps being served and will cycle on only when needed to maintain a preset vacuum range.

To provide verification that a pump is primed and ready to run, a water level control switch provides a signal from the priming valve to the pump controller.  In the unlikely event that a priming valve fails and water begins to flood the system, a high water level switch installed in the air receiver will signal an audible and visual alarm while shutting down the priming system.   Dry alarm contacts are provided in the Q-VAC control panel to allow remote monitoring.   

 Q-VAC Priming Systems increase water pump efficiency by removing entrained air while eliminating the possibility of a pump becoming air bound.  Automatic operation of a Q-VAC Priming System ensures that every pump connected is always primed.