VENTIL ZUR DICHTHEITSPRUEFUNG EINES STEIGROHRES.

摘要

A tubing tester valve comprises a tubular housing assembly (100) having a downwardly closing, spring biased flapper valve (136) disposed therein near the top thereof. A tubular mandrel assembly (102) is disposed within the housing assembly below the flapper valve, and includes a piston section (230), and is secured to the housing assembly with shear pins (270). The tubing tester valve may be permanently opened through the application of annulus pressure from the rig floor to the annulus surrounding the pipe string, which pressure acts on the piston section to move the mandrel assembly upward to rotate the flapper valve to an open position. In order to ensure that the mandrel assembly does not subsequently retract downwardly permitting the flapper valve to reclose, a spring biased locking means (280) is provided to hold the mandrel assembly in its "up" position.