Hydraulic actuating arrangements
AssigneeJoseph Lucas (Industries) Limited
InventorCharles Philip Smith
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Abstract
A hydraulic actuator arrangement has a pair of double acting actuator devices coupled together for movement in unison. Each device has two control valves respectively operable to cause the device to move in opposite directions. The four control valves are resiliently coupled so that both actuator devices are normally energised simultaneously. Each control valve has an associated pressure relief valve so that failure of any one of the control valves permits the pressures on either side of the associated actuator device to be equalized.
Claims6
A hydraulic actuator arrangement comprising a pair of double-acting actuator devices, said actuator devices being interconnected for movement in unison, first and second control valves each having independently movable control elements which are respectively operable to provide first and second pressure signals to drive one of said actuator devices in respective opposite directions, third and fourth control valves each having independently movable control elements which are respectively operable to drive the other of said actuator devices in respective opposite directions, means for moving said control elements, resilient means connecting said moving means with each of said control elements for normally moving the latter in unison, means for applying a supply pressure to said valves and four relief valves for preventing said first, second, third and fourth pressure signals respectively from exceeding said supply pressure by more than a predetermined amount.
Dependencies are inferred from the claim text.