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1. (WO2018104726) VALVE ASSEMBLY

Pub. No.:    WO/2018/104726    International Application No.:    PCT/GB2017/053669
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Wed Dec 06 00:59:59 CET 2017
IPC: F16K 31/163
F15B 15/06
F16K 5/06
E21B 34/04
E21B 34/06
E21B 34/00
Inventors: WALKER, Neil
A valve assembly for an oil, gas or water well, the valve assembly comprising a conduit having a bore;a valve closure member movable on a rotational path around a pivot axis to open and close the bore;a drive member movable on a linear path; and a drive train transmitting force between the drive member and the valve closure member; wherein the drive train comprises a plurality of bearing devices(e.g. ball bearings)constrained in a bearing track. Moving the drive member rotates the valve closure member(e.g. a ball valve) between open and closed configurations to open and close a fluid flowpath in the well. The actuating assembly can be actuated between different configurations using differential fluid pressure, optionally transmitted in an annulus of the well.