The high efficiency (HE) unit offers superior performance, more than any other conventional beam pumping unit. In addition to clockwise and counterclockwise operation, it provides 186 degrees of rotation in the clockwise direction instead of the usual 180 degrees. This additional crank upstroke provides more pump fillage than other units of comparable size.
The Liberty Lift enhanced geometry (EG) unit provides 192 degrees of crank rotation, providing the optimum mechanical efficiency during upstroke. The optimized design promotes higher load ranges of the polished rod without causing torque overload.