EP 0431162 A4 19930310 - BY-PASS VALVE FOR BORING COLUMN
Title (en)
BY-PASS VALVE FOR BORING COLUMN
Publication
Application
Priority
SU 8900177 W 19890623
Abstract (en)
[origin: WO9100412A1] A by-pass valve for a boring column comprises a hollow casing (1) with lateral openings (2), a saddle (4) constituted by the internal surface of the casing (1) and a closing element consisting of an elastic, resilient sleeve (3) secured by one of its ends in the casing (1). The sleeve (3) is mounted with a gap (6) and is provided with a confusor (7). The valve may be provided with a jacket (8) or with shutters. The absence of moving parts, better sealing of the channel for the flow of the liquid, and decreased hydraulic resistance of the valve lead to a reduced wear and destruction of its parts and increases the reliability and longevity of the valve.
IPC 1-7
IPC 8 full level
E21B 34/10 (2006.01); E21B 34/06 (2006.01)
CPC (source: EP)
E21B 34/06 (2013.01)
Citation (search report)
- Keine Entgegenhaltungen.
- See references of WO 9100412A1
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 9100412 A1 19910110; EP 0431162 A1 19910612; EP 0431162 A4 19930310; JP H04500546 A 19920130
DOCDB simple family (application)
SU 8900177 W 19890623; EP 89909457 A 19890623; JP 50875289 A 19890623