FIELD: oil and gas production.
SUBSTANCE: back valve consists of case with seat, and of locking device installed in bore, interacting with seat and equipped with spring elements in form of two plate springs. The locking device has two locking elements made of halves of circular cylinder by section of each with two mutually transverse inclined surfaces, upper one of which is inclined at angle below 90° to plane of cylinder circumference, while the side surface is inclined at the same angle to its axis. Upper ends of the locking elements interacting with the seat and their side interacting surfaces are covered with elastomer. A unit of fixation of locking and flexible elements in the case is made in form of a ring secured in the bore of the case.
EFFECT: simplified design, raised reliability and expanded functionality at minimal overlapping area of pass-through channel.
5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| RETURN VALVE | 2016 |
|
RU2641146C2 |
| OVERFLOW CHECK VALVE | 2011 |
|
RU2466265C1 |
| CORE-TAKING TOOL | 2006 |
|
RU2318981C1 |
| BOTTOM-HOLE BLOWOUT PREVENTER | 0 |
|
SU1602972A1 |
| CORE SAMPLING TOOL | 2005 |
|
RU2315851C2 |
| DRILL STRING OVERFLOW VALVE WITH SCREW WELL BOTTOM ENGINE | 2016 |
|
RU2641800C1 |
| CHECK VALVE | 2002 |
|
RU2213845C1 |
| EJECTOR-TYPE CORE TOOL | 0 |
|
SU1470932A1 |
| CORE AND GAS SAMPLER | 2002 |
|
RU2209922C1 |
| CORE BARREL | 0 |
|
SU1654527A1 |
