Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Charles Frederick Carder0
Paul David Ringgenberg0
Date of Patent
March 10, 2015
0Patent Application Number
128685550
Date Filed
August 25, 2010
0Patent Citations Received
Patent Primary Examiner
Patent abstract
According to one embodiment, a recirculation safety valve is disclosed. The valve has a tubular body with mandrel that is axially shifted in response to annulus pressure. Shifting of the mandrel can either close a safety valve or close a safety valve and open a recirculation port. The valve has an annular actuation chamber that relieves that pressure to prevent inadvertent shifting of the mandrel.
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