Redundant flow control for hydraulic actuator systems

Details Redundant flow control for hydraulic actuator systems Redundant flow control for hydraulic actuator systems

2006-01-03

2006-01-03

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Having redundant means enabling load to be driven upon...

C060S403000

Reexamination Certificate

active

06981439

ABSTRACT:
Two or more flow control valves may be used to provide redundant flow control for a hydraulic actuator or servoactuator. The flow control valves include a sleeve, a bypass control spool, and a primary control spool. Under normal operating conditions, each bypass control spool is stationary relative to the sleeve and the flow control valve functions as a four-way hydraulic flow control valve. Each flow control valve is connected to a bypass-shutoff valve including a bypass spool that is moveable from a shut-off position to a bypass position. Upon supply pressure failure to one flow control valve, the bypass spool moves to the bypass position, reducing pressure in the corresponding actuator piston chambers. When a primary control spool becomes jammed, the corresponding bypass control spool moves within its sleeve allowing a bypass groove to port control pressure to the return line, thereby reducing pressure in the corresponding actuator piston chambers.

REFERENCES:
patent: 3270623 (1966-09-01), Garnjost et al.
patent: 3683749 (1972-08-01), Bayles
patent: 3837262 (1974-09-01), Hedermann
patent: 3933176 (1976-01-01), Wheeler
patent: 4472780 (1984-09-01), Chenoweth et al.
patent: 4472998 (1984-09-01), Vanderlaan
patent: 1321148 (1973-06-01), None

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