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Kelly valves (kelly cocks)<br />
An upper kelly valve is installed between the<br />
swivel and the kelly.<br />
A lower kelly valve is installed imediatelly<br />
below the kelly.<br />
Upper kelly has on the top the left-hand screw<br />
to avoid un<strong>control</strong>led screw of, and on the<br />
bottom there will be a right-hand screw.
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