| 摘要 |
FIELD: oil and gas extractive industry. ^ SUBSTANCE: device has body with radial channels, valve bushing with inner recess, cylindrical clamp with spring-loaded radial cams. Bushing is made with possible overlapping of radial channels in case of its displacement. Cams are made with possible extension and displacement with recess. Differential piston with rod forms a working hydraulic hollow with cylindrical clamp. Clamp is lowered inside the body on tubing pipes. Hollow is filled with working liquid and connected to inner hollow of tubing pipes through flow throttling valve and intermediate branch pipe, and to outer tubing column hollow - through throttling bushing in piston. Rod is rigidly connected to conical bushing. Hollow of intermediate branch pipe is filled with working liquid. ^ EFFECT: higher reliability. ^ 1 dwg |
