PRESSURE BOOSTER Russian patent published in 1999 - IPC

FIELD: plants requiring heavy forces at small size of hydraulic power units. SUBSTANCE: booster case 2 mounts in its bore 3 two round-section flexible rings 8 with stop 9 in- between which supports sealing lugs of cups 4; stop 9 is free to move in axial direction when its side surface 10 is actuated by ring 8 mounted on side of high-pressure (P₁) cavity 5; side surfaces 10 are concave torus-shaped structures; placed between flexible ring 8 and end of L-shaped cup 4; installed on side of drain cavity 7 is washer 11 having concave torus-shaped surface 12 facing flexible ring 8. Plunger starts displacing at minimal force applied to it. EFFECT: improved efficiency, reduced size and weight, improved speed and service life of booster. 3 dwg