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The system in drawing below represents a pressure regulated power system comprised of
1) the power system, and
2) the actuating system part of the overall hydraulic system.
This type of system was used in all aircraft between 1937 and 1945. The system had a
pressure regulator which "knew" when to withdraw horsepower from the engine when
it was needed. The concurrent blue-red system drawn in that manner because when the
bypass part of the system was used, the blue-red part of the system acted as the return
line to the reservoir and, thus, was "blue". However, the power system was
used to produce hydraulic power, the blue-red part of the system was filled with high
pressure oil and, therefore, was "red".
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Updated: March 12, 2004