Apparatus for the testing of valve production, machine tool to bottom of poco, and test process of production of a poco

摘要

A flow tester valve apparatus includes a housing (62) having a flow passage disposed therethrough, with a flow valve disposed therein for opening and closing the flow passage. A power mandrel is disposed in the housing and includes a power piston (156A). The power mandrel is operatively associated with the flow valve for moving the flow valve from its closed position to its open position. A power port (192) transmits pressure from a well annulus to a first side of the power piston. The power piston includes a main piston (400) and a booster piston (402). The booster piston initially acts with the main piston to provide a force for moving the power mandrel, but after limited initial movement, the booster piston makes no further contribution.