HYDRAULIC-DRIVEN PUMP SET Russian patent published in 2013 - IPC F04B47/08 

FIELD: engines and pumps.

SUBSTANCE: main pump 1 is made in the form of a stemless cylinder 8 with a doubled piston 9 filled with a sealant 10 and comprises an elastic element 11 for pressing of the sealant 10. Movement of the piston 9 during suction is carried out with a well fluid. The working fluid compensator 6 is also made in the form of a stemless cylinder 18 with a doubled piston 19 filled with a sealant 20 and comprising an elastic element 21 for pressing of the sealant 20.

EFFECT: expanded operational parameters, simplified design and increased reliability of hydraulic-driven pump sets.

5 dwg, 2 cl