MANUAL TWO-CYLINDER HYDRAULIC PUMP Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: first and second pistons are located in cylinders for motion in anti-phase by means of common operating handle mounted in the housing in pumping axis and located between them. Distribution devices include suction valve for periodic connection of first cylinder with reservoir for the liquid being handled and discharge valve for connecting the second cylinder with delivery hydraulic line of the pump. First cylinder is brought in communication with second cylinder by means of check valve which opens towards second cylinder. Effective area of first cylinder is more than that of second cylinder by 1.1 to 2.0 times. EFFECT: enhanced efficiency. 3 dwg