Force Pump, Double Acting
     This pump is more efficient that a single-acting force pump such as a simple Lift Pump or a hand-operated Bilge Pump. 
     Each stroke of the piston fills one chamber and empties another, which nearly doubles the flow rate (less the volume of the piston rod) over a single-acting force pump. It also smooths the flow.
     From the outside this pump can take many forms, but the basic principal of operation will be identical.
These are still representations and possibly also low-resolution images of fully animated pumps.
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