FIELD: mining industry. SUBSTANCE: device has case 1 provided with saddle 2 which is overlapped by gate 3. The gate is pressed against saddle 2 by spring 4. Case 1 is closed by cap 5 and packed by metal gasket 6. Spindle 8 is mounted in cap 5; the spindle may interact with shank of gate 3. The shank is made in form of stage-shaped bushing 9. When pumping solution through, spindle 8 is screwed down at valve in inlet tap of fittings till rest. Spindle is screwed out at valve in outlet tap of the fittings. Spindle 8 when resting against protrusion of the bushing, lifts and holds gate 3 above saddle 2. EFFECT: improved reliability of operation; improved efficiency. 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| WELLHEAD DEVICE FOR PROTECTION OF X-MAS TREE FROM HIGH PRESSURE | 1990 |
|
RU2030551C1 |
| DRILL PIPE SPINNER | 1991 |
|
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| APPLIANCE FOR REPLACEMENT OF GATE VALVES OF WELLHEAD EQUIPMENT WITHOUT WELL KILLING | 1992 |
|
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| BLOWOUT PREVENTER | 1992 |
|
RU2023136C1 |
| ODDSHORE WELLHEAD EQUIPMENT | 0 |
|
SU1530748A1 |
| METHOD FOR WASHING OF WELLS | 1990 |
|
RU2023860C1 |
| WELL-HEAD GATE VALVE | 0 |
|
SU1654533A1 |
| WELL PUMPING PLANT | 1991 |
|
RU2022172C1 |
| HOLE-CLOSING APPARATUS | 0 |
|
SU1137181A1 |
| PIPE HEAD | 0 |
|
SU1514904A1 |
