PRIVATE WATER SYSTEMS - Installation - Control Units - Shallow Piston Pumps

Shallow Piston Pumps

For a shallow-well piston pump with pressure tank, a shallow-well float-type control will be needed.

Tank and Pump Back Arrow When the water level in the pressure tank gets too high, the float riding on the water surface inside the tank is high enough to open the air valve in the control. This allows the pump to draw outside air into the air-control volume, past the air valve and into the tube that connects to the suction side of the pump. From there it is drawn into the pump where it mixes with the water into the pressure tank. The air then separates from the water and rises to the top of the tank.

As air accumulates in the tank the water level lowers due to the increasing pressure. The float rides at a lower position, and a point is finally reached where the float will not open the air valve at any time during the pumping period. This shuts off air to the pump until the water level in the tank rises high enough to again open the valve.

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