US 6,981,439 B2 | ||
Redundant flow control for hydraulic actuator systems | ||
Kenneth E. Hart, Simi Valley, Calif. (US) | ||
Assigned to HR Textron, Inc., Santa Clarita, Calif. (US) | ||
Filed on Dec. 23, 2003, as Appl. No. 10/746,033. | ||
Claims priority of provisional application 60/497284, filed on Aug. 22, 2003. | ||
Prior Publication US 2005/0132877 A1, Jun. 23, 2005 | ||
Int. Cl. F15B 13/00 (2006.01) |
U.S. Cl. 91—509 | 38 Claims |
1. A hydraulic flow control system for use with a tandem hydraulic actuator, said system comprising:
a flow control valve assembly including a sleeve, a bypass control spool slidingly disposed within said sleeve, and a primary
control spool slidingly disposed within said bypass control spool;
a bypass-shutoff valve hydraulically coupled to a supply line, a return line, a pressure control line, an actuator extend
line and an actuator retract line; and
a restrictor-check valve assembly, wherein said restrictor-check valve assembly is hydraulically coupled to said bypass-shutoff
valve and said supply line.
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