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Glossary:RDDK

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a Weatherford valve, retrievable dummy dump valve. It is a valve that is placed in a standard gas lift mandrel and has a fracture rod for pressure shearing (then has a check valve to prevent tubing to casing communication). It can be used to displace the completion fluid from the "A" annulus during the completion. It can later be pulled like a regular GLV and replaced with a dummy or live valve.