PUMPING STATION FOR HYDRAULIC DRIVE Russian patent published in 1994 - IPC

FIELD: manufacture of pump. SUBSTANCE: pumping station has pump 1, control hydraulic device 5 made in form of overflow valve, safety valve 8, throttle valve 9 and hydraulic lines connecting them. Overflow valve outlet is brought in communication with suction hydraulic line 2 of pump 1 by means of return hydraulic line 7. Throttle valve 9 is fitted in hydraulic return line 7 of the overflow valve. Before throttle valve 9, hydraulic return line 7 of the overflow valve is brought additionally in communication with spring chamber 6 of overflow valve and with suction hydraulic line 2 of pump 1 by means of safety valve 8. EFFECT: enhanced efficiency. 1 dwg