| 摘要 |
A tubing injector for injecting tubing (4) into a pipeline or bore or the li ke comprises: an annular piston for moving the tubing (4); a collet for grippin g the tubing on movement of the piston in an injecting direction, the collet (14) and the tubing being movable with the piston, and the collet being releasable from the tubing (4) on movement of the piston in another directio n, and a ratchet collet for preventing the tubing from being ejected.
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