(57) A hydraulic control device, for the actuation of a hydraulic user device, with input
pressure compensator, comprising a bidirectional pilot valve (1) which can be actuated
in order to connect one actuation branch (A or B) of a user device to a pressurized
branch (P) of a hydraulic circuit and the other actuation branch (B or A) of the user
device to a discharge branch (T) of the hydraulic circuit, and a pressure compensator
(2), which is arranged on the pressurized branch (P) of the hydraulic circuit that
enters the pilot valve (1). The pressure compensator (2) is affected by the pressure
in the pressurized branch (P) of the hydraulic circuit, and the pressure acts so as
to close the pressure compensator (2). The bidirectional pilot valve (1), in connecting
a user device (A or B) to the pressurized branch (P) of the hydraulic circuit, also
connects the pressurized branch (P) to the pressure compensator (2), but so as to
maintain or increase its aperture, and to the discharge branch (T) of the hydraulic
circuit through a choke (31, 81) so as to force the pump, which feeds the hydraulic
circuit, to operate at a pressure which is significantly higher than required for
the actuation of the user device (A or B), thus achieving higher operating stability.
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