ARRANGEMENT OF VALVES, COMBINATION OF TWO SUPPORT LEGS AND PUMP CYLINDER FOR SAID ARRANGEMENT Russian patent published in 2010 - IPC E21D23/16 F15B11/02 F15B13/01 

FIELD: engines and pumps.

SUBSTANCE: arrangement of valves of support legs 10, 11 comprises two controlled check valves 24, 25 connected in parallel, one of them, 24, being connected on inlet side to return pipeline R and second one, 26, being connected on outlet side with outlet of piston A1 of leg 10. Note here that at least another one controlled check valve 22, 28 is used with its outlet side connected with outlet A' of leg 10 piston surface and its inlet being connected with return tube R or control contact of A2 of the valve. Combination of two support legs 10, 11 and pump cylinder 50 for arrangement above that comprises two stepped pistons fitted coaxially in common casing differs from known design in that each piston forms piston space and annular space, while casing has two annular outlets communicated with piston surface outlet of appropriate leg.

EFFECT: higher reliability of operation.

11 cl, 3 dwg