Balance hydraulic pumping unit

摘要: A balanced hydraulic well pumping unit for actuating an underground pump in which the weight of downstroke is utilized to store energy accumulator then used assist upward stroke pump. working rod passes through first and second vertically positioned cylinders connected pistons cylinders, respectively. Hydraulic power means are cylinder alternately supplying fluid opposite sides piston moving upwardly downwardly. An ends whereby downward movement causes on unit. Preferably, sucker extends into thereby allowing be close surface. Various controls provided admitting replenishing air cylinder, but limiting amount fluid.