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Flapper-type float valve<br />
The flapper-type float valve offers<br />
the advantage of having the<br />
opening through the valve that is<br />
approximately the same inside<br />
diameter as that of the tool joint.<br />
This valve will permit the passage of<br />
balls, or go-devils, which may be<br />
required for operation of tools inside<br />
the drill string below the float valve.
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