Title: Pressure actuated signal fluid control for load responsive systems

Abstract: A hydraulic system includes a fluid responsive means that controls the effective output of the pump in response to pressurization of signal fluid that is supplied by the pump. The signal fluid is pressurized by flowing through a synthetic signal generator and on into a fluid motor in opposition to the working pressure therein. This signal fluid is directed to the fluid motor by the directional control valve when the directional control valve is in an operating position; and it is directed to a sump by the directional control valve when the directional control valve is in a standby position. The present invention provides pressure actuated means to divert or occlude this signal fluid from the directional control valve except when the directional control valve provides a load sensing flow path which communicates this signal fluid to the fluid motor.

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Inventors: Miller, Wendell E. (Warsaw, IN, US)

Application Number: 716019
Filing Date: 1976-08-19
Publication_date: 1978-05-16
Assignee: The Scott & Fetzer Company (Kokomo, IN)
Primary Class(es): 60/445 60/450, 60/484, 91/444, 137/118.06, 137/596.13
Other Classes:
US Patent Ref:

2830767	Apr, 1958	Herbenar	137/119.
3447556	Jun, 1969	Howeth	137/119.
3456442	Jul, 1969	Brooks	60/468.
3878864	Apr, 1975	Schurger	137/596.
3971216	Jul, 1976	Miller	60/445.

Other Refs:
Primary Examiner: Geoghegan, Edgar W.
Assistant Examiner:
Attorney: McNenny, Pearne, Gordon, Gail, Dickinson & Schiller