Arrangement for influencing the operating quantity of a...

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F - Mech Eng,Light,Heat,Weapons

15

B

138/56.12

F15B 9/08 (2006.01) E02F 9/22 (2006.01) F15B 11/05 (2006.01) F15B 13/04 (2006.01)

Patent

CA 1057163

ABSTRACT OF THE DISCLOSURE The invention relates to a fluid pressure supply and exhaust system for controlling a two port servo-motor wherein negative loads are anticipated for one side of the servo-motor The system has a switching valve unit for selecting parallel supply and exhaust branches to direct supply fluid to the servo-motor side subjected to negative loading. There are pressure regulating and throttling valves in the supply branch and a reducing valve in the exhaust branch. The supply pressure downstream from the throttle valve is directed to the reducing valve with a valve closing effect so that a sharp negative load will simultaneously reduce the supply pressure to the servo-motor while increasing the throttling of the return flow.

269906

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