DISTRIBUTING UNIT Russian patent published in 2009 - IPC F15B13/00 

FIELD: machine building.

SUBSTANCE: proposed distributing unit is intended for hydraulic systems and incorporates check valve 2, three two-position two-line distributors 3, 4, 5 arranged in the body 1, each furnished with a spring-loaded step valve with a control chamber, piston and con rod interacting with inlet and outlet hydraulic lines of distributors 3 to 5 in unit body 1. Body 1 has three feed channels 6, 7, 8, three discharge channels 9, 10, 11 and drain channel 12 communicating with spring spaces 13, 14, 15 of distributors 3, 4, 5. Distributor 5 is normally-closed and spring-loaded on the side of its piston, while its con rod control chamber 16 communicates with the outlet of check valve 2 and with the piston control spaces 17, 18 of the other two normally-open distributors 3, 4, respectively. The first channel 6 of body 1 communicates with the inlet of check valve 2, the outlet of which is connected to the first discharge channel 9 and to the inlet hydraulic line of the thirds distributor 5 communicating with, via the outlet hydraulic line, with the third channel 11 of the branch pipe of body 1. The inlet hydraulic lines of the first and second distributors 3, 4 are interconnected and jointed to the second feed line 7, while the outlet hydraulic lines communicate with the second and third discharge channels 9, 10, respectively. Channel 11 of the third offtake accommodates throttle 19. Second feed channel 7 and third 11 offtake channels are interconnected via valve 20. The second offtake channel 10 accommodates additional valve 21. The unit is furnished with expander 22 to separate suspended and dissolved air, the expander upper part being connected via pipelines (nor designated) with the third offtake channel 11 and it lower part being connected with the third supply channel 8 of the housing 1 of the unit.

EFFECT: expanded performances for operation in, at least, four operating conditions with simultaneous or serial operation of any of both pumps.

4 cl, 5 dwg