(19)
(11) EP 0 057 526 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.08.1982 Bulletin 1982/34

(43) Date of publication A2:
11.08.1982 Bulletin 1982/32

(21) Application number: 82300228

(22) Date of filing: 15.01.1982
(84) Designated Contracting States:
DE FR GB

(30) Priority: 30.01.1981 US 229677

(71) Applicant: Clark Equipment Company
 ()

(72) Inventor:
  • Chichester, Willard Lyle
     ()

   


(54) Hydraulic circuit selector with flow control


(57) A hydraulic circuit selector with flow control for selectively operating any one of a plurality of hydraulic actuators (22, 24) at a given time and for bypassing the excess flow to the sump (34) if the actuator (24) being operated requires a lower fluid flow rate than that supplied to the circuit selector (50). An orifice (80 or 90) is disposed between the circuit selector (50) and actuator (24) in each line (64 or 66) which may function as a pressure line to the actuator. A hydraulic line (82, 85 or 92, 95) is connected to the pressure line (64 or 66) upstream from the orifice (80 or 90) and to a return line (66 or 64). A bypass valve (84 or 94) is disposed in the connecting line (82, 85 or 92, 95) and detects a pressure drop across the orifice (80 or 90) to open the bypass valve (84 or 94) and bypass the excess flow from the pressure line to the return line.







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