(19)
(11) EP 0 256 648 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.11.1989 Bulletin 1989/44

(43) Date of publication A2:
24.02.1988 Bulletin 1988/08

(21) Application number: 87305960.4

(22) Date of filing: 06.07.1987
(51) International Patent Classification (IPC)4: F15B 18/00
(84) Designated Contracting States:
DE ES FR GB IT

(30) Priority: 08.08.1986 GB 8619412
04.03.1987 GB 8705071

(71) Applicant: FAIREY HYDRAULICS LIMITED
Middlesex, TW5 9NQ (GB)

(72) Inventor:
  • Fuell, Frederick James
    Nailsea Bristol, BS19 2PU (GB)

(74) Representative: Robinson, Anthony John Metcalf et al
Kilburn & Strode 30 John Street
London, WC1N 2DD
London, WC1N 2DD (GB)


(56) References cited: : 
   
       


    (54) Hydraulic control system


    (57) An hydraulic control system, for example for use in moving control surfaces of aircraft, comprises first and second actuators (12A, 12B) operating in tandem. The two actuators are supplied by independent hydraulic pathways (P1, P2), the fluid in each of these pathways being controlled by a plurality of direct drive control valves (4) connected across the two pathways. The system will therefore operate even if three of the control valves, and one of the hydraulic supplies are non-operational.







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