FIELD: mining.
SUBSTANCE: check valve comprises housing, valve gate, and passages. The valve gate is secured to the axle and is made of a flexible ring. The ring groove in the face cooperates with the ring projection of the flexible valve gate. The inner diameter is provided with a recess. The recess receives a stabilizer with conical surface and passages. The stabilizer cooperates with the valve gate from one side. From the other side the stabilizer cooperates with the face of the junction through the flexible ring.
EFFECT: enhanced reliability.
1 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| CASING-HEAD STUFFING BOX | 2001 |
|
RU2205307C2 |
| CHECK VALVE | 2001 |
|
RU2205310C2 |
| LOCKING DEVICE | 2010 |
|
RU2447343C2 |
| CHECK VALVE | 2004 |
|
RU2278313C2 |
| BACK VALVE | 2007 |
|
RU2373448C2 |
| LOCKING DEVICE | 2009 |
|
RU2454585C2 |
| UNIVERSAL CASING HEAD FOR CONNECTIONS OF CASING STRINGS ON WELLHEAD | 1999 |
|
RU2173764C2 |
| CHECK VALVE | 2005 |
|
RU2300684C2 |
| CHECK VALVE | 2004 |
|
RU2285179C2 |
| NON-RETURN VALVE | 2009 |
|
RU2416755C1 |
