The IBOP is a non-return valve (check valve), also called Gray Valve or BVR, is a back pressure valve used in the drill string to prevent the well form uncontrollably up the drill string. It is used to hold the tool open therefore it is possible to stab the valve while the fluid is flowing through the drill pipe. With the IBOP valve installed in the drill string, it allows you to strip in hole without mud flowing through the drill string. The IBOP valve should not be used for shut the well in while tripping.
IBOP for top drive used for top drive. It includes upper IBOP for top drive and lower IBOP for top drive. They are used for top drive drilling system with joined one by one. It is hydraulically operated and manually operated control valves in top drive circulating system, and special use for drill stem inside blowout emergency. It has a pressure rating of 10000 psi or 15000 psi respectively at the factory. The bore of the valve body and all internal parts are special treated to prevent damage from corrosion and have a long life service.