Full-Bore Valve

A valve with unobstructed flow area dimensionally equal to or greater than the nominal connection size.

Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards


Full-Bore Valve

Valve whose closure mechanism has a bore dimension the same as or larger than the valve body.

Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards


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