Abstract: A test plug for sealing a bore within a tubing hanger comprising an annular plug body having an axial bore extending therethrough, the axial bore forming a tapered annular seat and an enlarged receptacle within the plug body; a plurality of support dogs retractably mounted within corresponding slots formed in the plug body adjacent a lower portion of the receptacle; a mandrel slidably received within the receptacle, the mandrel having a downwardly and outwardly facing cam surface formed on a lower portion thereof; and a stinger having a tapered closure member adapted to be received in the annular seat, a spring for biasing the closure member against the seat and a seal ring for providing a fluid-tight seal between the closure member and the seat; wherein each support dog comprises an inner beveled edge formed on an upper portion thereof which preferably matches the cam surface of the mandrel, such that when the mandrel is set the cam surface will engage the beveled edge and urge the support dogs into an annul

Abstract: The present invention is directed to a dual backseat valve assembly comprising a valve body having an interior valve chamber and a generally horizontal flow passage; a valve gate adapted to reciprocate vertically within said valve chamber; a valve stem adapted to be received in threaded engagement with a gate lift nut mounted in said gate such that rotation of said stem causes vertical movement of said gate and a valve bonnet fixed to said valve body receiving said stem therethrough; wherein the valve stem comprises a radially extending portion defining a downward facing surface, a first enlarged diameter portion proximate the radially extending portion and a reduced diameter portion adjacent the first enlarged diameter portion; a first backseat seal comprising a radially energized seal ring fixed relative to said bonnet and having a first sealing portion for sealing against said bonnet and a second sealing portion which is adapted to be spaced apart from said reduced diameter portion when said valve is in no