HYDRAULIC RAM Russian patent published in 2013 - IPC F04F7/02 

FIELD: engines and pumps.

SUBSTANCE: hydraulic ram comprises pressure pipeline, air chamber with inlet valve communicated with said pipeline, piston fitted in casing and piston stroke limiter. Said piston is secured to rod. Hydraulic ram comprises hydraulic drive composed of interconnected piston-type one-way servo-motor and throttle valve. Piston fitted in cylinder is arranged parallel with pressure pipeline. Impact valve hinge pin is located between pipeline axis and pipeline wall.

EFFECT: higher efficiency of hydraulic rams.