FIELD: machine building.
SUBSTANCE: group of inventions refers to a control device for controlling the movement of a hydraulic cylinder, a control system for moving a ring seal of a hydraulic machine and a hydraulic machine. Device (16) includes valve (26) comprising body (30) connected to first chamber (22) of cylinder (6) through first hydraulic connection (32) and to second chamber (24) of cylinder (6) through second hydraulic connection (34). Device comprises first hydraulic channel (42) connected to first fluid source (40) and second hydraulic channel (46) connected to second fluid source (44). Channels (42, 46) communicate with body (30). Valve (26) further comprises dispenser (56) movable in body (30) between a first position in which device (56) establishes a fluid communication between connection (32) and channel (42) and the second position, in which device (56) establishes a fluid communication between connection (34) and channel (42).
EFFECT: group of inventions is aimed at creating a simple and reliable control device that does not require additional components.
9 cl, 4 dwg
