EP 0067815 B1 19860402 - SYSTEM WITH CONSTANT FORCE ACTUATOR
Title (en)
SYSTEM WITH CONSTANT FORCE ACTUATOR
Publication
Application
Priority
US 8001741 W 19801224
Abstract (en)
[origin: WO8202230A1] A control mechanism (48) to controllably maintain a constant force on an actuator (18) and provide fluid flow to a downstream control valve (24) by controlling a pilot differential pressure between first and second ends (38, 40) of a pilot operated control valve (14). A two position valve (56, 66) acting in response to a predetermined pressure level in the actuator (18) modulatably controls the flow of pressurized pilot fluid to the pilot operated control valve (14) to position the pilot operated control valve (14). This maintains the pressure in the actuator (18) at the predetermined pressure level and passes the excess flow of fluid from a source (12) to the downstream control valve (24).
IPC 1-7
IPC 8 full level
F15B 11/20 (2006.01); B66C 13/20 (2006.01); B66F 9/22 (2006.01); F15B 11/02 (2006.01); F15B 11/08 (2006.01); F15B 11/16 (2006.01)
CPC (source: EP)
F15B 11/02 (2013.01); F15B 2211/20538 (2013.01); F15B 2211/30505 (2013.01); F15B 2211/30525 (2013.01); F15B 2211/3116 (2013.01); F15B 2211/3144 (2013.01); F15B 2211/50518 (2013.01); F15B 2211/5151 (2013.01); F15B 2211/6054 (2013.01); F15B 2211/6058 (2013.01); F15B 2211/6355 (2013.01); F15B 2211/7053 (2013.01); F15B 2211/71 (2013.01); F15B 2211/76 (2013.01); F15B 2211/781 (2013.01)
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
WO 8202230 A1 19820708; BE 891227 A 19820316; DE 3071525 D1 19860507; EP 0067815 A1 19821229; EP 0067815 A4 19840404; EP 0067815 B1 19860402; JP H0118285 B2 19890405; JP S57502013 A 19821111
DOCDB simple family (application)
US 8001741 W 19801224; BE 206635 A 19811124; DE 3071525 T 19801224; EP 81901579 A 19801224; JP 50196681 A 19801224