| 摘要 |
The invention relates to the cementing heads for oil wells and the like. The head is mounted on the pipe column 1 and sleeve 2 assembly. It comprises an internal tubular part 3 which cannot move rotationally and an external tubular part 4 which can move rotationally. Each tubular part includes orifices which can be made to coincide alternately by suitable rotation of the component 4. The fluid flows out through the coinciding orifices and drives out the mechanical plugs 5 and then 6. <IMAGE>
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