How High Lifters
WorkHigh Lifter Pumps  How Do They Work?The High Lifter is a doubleacting, reciprocating differential piston, fluidpowered pressure intensifier. It transfers the energy from a larger volume of lowpressure liquid to a smaller volume of liquid, imparting to it higher pressure. This pumps the smaller volume under high pressure. The degree of pressure intensification that the High Lifter provides depends on the volumetric ratio of the pump: the ratio of the area of its large piston to the area of its small piston. 
The High Lifter works as a kind of hydraulic lever.

Your specific needs will
determine the pump ratio selected. This ratio will in turn determine the percentage of
inlet flow being pumped. High Lifter model H74 is available in volumetric ratios from 2:1
to 22:1. The smaller models H44 or H49 are 4.5:1 and 9:1, respectively. Because of their design, High Lifter pumps can be readily converted from one ratio to another. 