Cast Iron External Gear Pumps 

Introduction of 3.5APF**  3.5APF** series external gear pumps have a floating busing with automatic axial clearance compensation. Gear pumps are the most common type of positive displacement pump used. Typically, a rotating assembly of two gears (a drive gear and an idler) moves to create suction at the pump inlet and draw in fluid. The liquid is then directed between the teeth of the gears and the walls of the casing to the discharge point. Volume decreases as the liquid travels from inlet to outlet, causing a buildup of pressure. Pressure relief valves are typically built-in to the pump to protect the pumping system from a closed valve in the discharge piping. Flow in gear pumps is determined by the size of the cavity (volume) between the gear teeth, the speed of rotation (rpm) of the gears, and the amount of slippage (reverse flow). Slip increases as the pump wears. Specifications Dimensio…