(57) A hydraulic fluid system comprising a fluid source, a plurality of hydraulic motors,
and a plurality of control valves communicating with said source. Each valve has a
neutral position and is selectively movable from its neutral position for controlling
flow to a respective hydraulic motor. Means for moving a valve from its neutral position
comprise means for communicating a pilot fluid flow from the source to one side of
the valve to establish a predetermined differential pressure force on the valve. A
fluid logic circuit provides a load sense pressure signal proportional to the highest
load on a motor in the system, and the load sense pressure signal is continuously
applied to both sides of each of the control valves so that the predetermined differential
pressure applied to a valve is essentially unaffected by changes in the load sense
pressure signal.
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