Kelly Valve, Lower

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An essentially full-opening valve installed immediately below the kelly, with outside diameter equal to the tool joint outside diameter.

Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards

An essentially full opening valve below the Kelly, with an OD same as the drill pipe..

Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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