EP 0804685 A2 19971105 - HYDRAULICALLY OPERATED ACTUATOR
Title (en)
HYDRAULICALLY OPERATED ACTUATOR
Title (de)
HYDRAULISCH BETRIEBENER ANTRIEB
Title (fr)
ACTUATEUR HYDRAULIQUE
Publication
Application
Priority
- GB 9600127 W 19960122
- GB 9501118 A 19950120
Abstract (en)
[origin: WO9622466A2] A hydraulic actuator (10) which controls the operation of a cylinder valve having a valve seat (11), and a valve element (12) which is linearly reciprocable between open and closed positions with respect to valve seat (11), a valve seal housed in the closing face of valve head (13), (or a part of the valve seat (11) engaged by head (13)), a valve operator connected to the valve element (12) and operable in a release mode to move the valve element away from its valve seat and in a valve-closing mode to move the valve element towards its valve seat, and a hydraulic actuator circuit (19, 22) communicating with the valve operator and operable to apply a closing motion to the valve element (12) via the valve operator which reduces in speed as the valve element (12) moves towards the valve seat (11) and engages with the valve seal. The hydraulic actuator is particularly suitable for controlling the operation of a cylinder valve of a positive displacement type compressor having "soft" seals, although it does have general application to hydraulic actuation of cylinder valves of other types of engine having valve controlled fluid pressure chambers which are filled, pressurised and then discharge pressure fluid in repeated cylces of operation.
IPC 1-7
IPC 8 full level
F04B 49/00 (2006.01); F01L 9/10 (2021.01); F04B 39/08 (2006.01); F15B 7/02 (2006.01); F15B 11/08 (2006.01)
CPC (source: EP)
F01L 9/10 (2021.01); F04B 39/08 (2013.01)
Citation (search report)
See references of WO 9622466A2
Designated contracting state (EPC)
BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
WO 9622466 A2 19960725; WO 9622466 A3 19960912; EP 0804685 A2 19971105; GB 9501118 D0 19950308; JP H10512658 A 19981202
DOCDB simple family (application)
GB 9600127 W 19960122; EP 96900641 A 19960122; GB 9501118 A 19950120; JP 52213696 A 19960122