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Rotational part of the<br />
preventer is mounted on<br />
the drill pipe by use of<br />
unique prong, and is<br />
posted on the working<br />
floor.<br />
When needed, the<br />
rotational head is<br />
connected to the housing,<br />
mounted on the top of<br />
annular preventer.<br />
Rotational sleeve is rotated<br />
by the rotation of the kelly,<br />
and is at the same time<br />
rotating the working rubber<br />
element on the cylindrical<br />
bearing.
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