The water supply comes in on the suction side of the fire pump and is controlled by the supply control valve. This is the main water shutoff for the entire system.

On traditional "bottom-up" automotive engine coolant systems, the lower hose runs to the water pump's suction side. As on any fluid system, suction results in negative pressure, aka vacuum. The ...

The use of hard suction provides an unobstructed 6-inch waterway from the 4 1/2-inch hydrant outlet directly into the pump suction manifold using the large side intakes, guaranteeing minimum ...