Connecting valve for reserve pump

Details Connecting valve for reserve pump Connecting valve for reserve pump

1976-03-19

1978-02-14

Cline, William R.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

91468, 417286, 137114, 137117, 137118, F15B 2000

Patent

active

040731405

ABSTRACT:
A valve device having a pressure operable valve piston, particularly for booster steering system, to selectively control pressure flow to a consumer device such as a hydraulic servomotor in order to permit use of a reserve pump in event of failure of a main pump. The valve in a neutral position combines the output of both pumps but is responsive to a first increase in the flow rate beyond a predetermined limit to shunt flow from the reserve pump to a sump. Upon further increase in the flow rate the valve piston moves to a position to also shunt part of the output from the main pump to a sump. Signal means is actuated by movement of the valve piston to apprise a vehicle driver that the steering system is operative.

REFERENCES:
patent: 2440371 (1948-04-01), Holley, Jr.
patent: 2905191 (1959-09-01), Vander Kaay
patent: 3279558 (1966-10-01), Allen et al.
patent: 3561327 (1971-02-01), Stremple
patent: 3742970 (1973-07-01), Gross
patent: 3882678 (1975-05-01), Fassbender

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