Global Patent Index - EP 0321609 B1

EP 0321609 B1 19920429 - OIL WELL SAFETY VALVE AND TOOL FOR INSTALLING SUCH A VALVE

Title (en)

OIL WELL SAFETY VALVE AND TOOL FOR INSTALLING SUCH A VALVE

Publication

EP 0321609 B1 19920429 (FR)

Application

EP 87202599 A 19871222

Priority

EP 87202599 A 19871222

Abstract (en)

[origin: EP0321609A1] The invention relates to an oil-well safety valve comprising, in the conventional way, a movable shutter member (11), an inner tubular slide (9), a return spring (10) for the slide, means for the hydraulic downward displacement of the slide by the pressurisation of a control fluid, a system (14) for anchoring the valve in a receiving sleeve (1), and gaskets (15, 16) in contact with said receiving sleeve (1). The gaskets (15, 16) are arranged on either side of the intake for the control fluid; the anchoring system (14) is positioned above said gaskets, whilst the return spring (10) is positioned below these in a part of the sealed volume receiving the control fluid. This spring is mounted round the slide between a bush (20) and a locking ring (19) eliminating any danger of expansion during dismounting. <IMAGE>

IPC 1-7

B25B 27/30; E21B 23/02; E21B 34/10

IPC 8 full level

E21B 34/10 (2006.01); E21B 34/00 (2006.01)

CPC (source: EP)

E21B 34/105 (2013.01); E21B 2200/05 (2020.05)

Designated contracting state (EPC)

DE GB IT NL

DOCDB simple family (publication)

EP 0321609 A1 19890628; EP 0321609 B1 19920429; DE 3778707 D1 19920604

DOCDB simple family (application)

EP 87202599 A 19871222; DE 3778707 T 19871222