| 摘要 |
FIELD: oil and gas production, particularly drilling rods or pipes. ^ SUBSTANCE: device comprises body and valve arranged in the body. The body is provided with inner cylindrical boring. The valve is made as central rod with channel. The rod is composed of fishing seat, cylindrical part, narrow cylindrical part and rest arranged in top-down direction. Hollow bush with lower radial openings is installed on cylindrical part of central rod so that the bush may perform downward movement. The bush movement is limited by rest. The bush has self-sealing collar, which permits liquid passage in bottom-top direction. In transport position the bush is fixed relatively central rod with shear member to seal the channel. After valve removal the channel establishes communication between spaces located from both self-sealing collar ends. Radial openings of hollow bush are adapted to receive dies, which may be displaced inwards and cooperate with inner cylindrical body boring and with cylindrical part of central rod in working position. After valve removal dies may cooperated with narrow cylindrical part of cylindrical rod and are brought out of engagement with inner cylindrical body boring. ^ EFFECT: increased operational reliability, elimination of device components drilling to open pipe string channel. ^ 2 dwg |
