PUMP WITH MUSCULAR DRIVE Russian patent published in 1994 - IPC

FIELD: pumping engineering. SUBSTANCE: piston rigidly coupled with a plunger is received within a case to form working chambers. Suction and delivery valves connect the working chambers with a tank filled with fluid to be pumped and delivery pipe line correspondingly. Additional piston is received within the case to form a space which accumulates fluid of high pressure and is coupled with the working chamber of the plunger through the delivery valve. Three- positioned hydraulic distributor connects the space with the delivery pipe line and the working chambers with the tank filled with fluid to be pumped additionally. EFFECT: enhanced efficiency. 1 dwg