EP 0159949 B1 19871223 - CONTROL DEVICE WITH SERVO VALVES
Title (en)
CONTROL DEVICE WITH SERVO VALVES
Publication
Application
Priority
FR 8406099 A 19840418
Abstract (en)
[origin: US4561470A] A control system for a fluid actuated control member is disclosed which utilizes a pair of electrically controlled servo valves to control the supply of servo pressure fluid to a control valve piston. The pair of servo valves are electrically controlled such that, under normal conditions, one of the servo valves is operative to supply the servo pressure signal, while the other servo valve remains in an inert, open position. Upon the detection of a malfunction in the operative servo valve, electrical switches render the malfunctioning valve inert and transfer the operative capabilities to the second servo valve. The hydraulic control system does retain 100% of its performance capabilities following a malfunction of the initial servo valve.
IPC 1-7
IPC 8 full level
F15B 13/043 (2006.01); F15B 18/00 (2006.01)
CPC (source: EP US)
F15B 13/043 (2013.01 - EP US); F15B 18/00 (2013.01 - EP US); Y10T 137/8659 (2015.04 - EP US); Y10T 137/86614 (2015.04 - EP US)
Citation (examination)
GB 1369441 A 19741009 - DOWTY BOULTON PAUL LTD
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0159949 A1 19851030; EP 0159949 B1 19871223; DE 3561256 D1 19880204; FR 2563289 A1 19851025; FR 2563289 B1 19880826; US 4561470 A 19851231
DOCDB simple family (application)
EP 85400760 A 19850417; DE 3561256 T 19850417; FR 8406099 A 19840418; US 72435785 A 19850418