The rupture disk (RD) bypass pressure test valve is a full-opening, single-shot annulus operated valve, The tool functions as a pressure testing and a bypass valve. The tool is commonly used at the start of a drillstem test to allow the toolstring to be pressure tested against the closed ball valve. This tool also has a bypass below the ball that allows the toolstring to be “stung in” to a production packer. To operate the inulus pressure is applied, rupturing the disk, closing the bypass ports, and opening the ball valve.

                                                                   Rupture Disk (RD) Bypass Pressure Valve