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Well control equipment

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Drill string float valves<br />

A float valve is placed in the drill string<br />

to prevent upward flow of fluid or gas<br />

inside the drill string.<br />

This is a special type of back pressure<br />

check valve.<br />

When in good working order it will prohibit<br />

backflow and a potential blowout through<br />

the drill string.

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