Consisting of a fail-as-is ball valve operated by hydraulic umbilical lines from surface, it can be used alone or in tandem with a second LV to deploy and pressure test long intervention strings.
The ball valve is operated by a hydraulic opening port and closing (balance) port that act on a balanced piston. Hydraulic fluid pumped into the opening or closing port returns to a surface control unit through the opposing port.
When closed, pump-through function across the ball is available to bullhead the well or equalize pressure across the ball. The pump-through function can be overridden using the close/balance line to permit pressure testing from above.
A cutter ball is available that can cut coiled tubing, slickline or wireline while closing.