Patent ID: 9103184
Filing Date: 2015-08-11
Classification: E21B

Abstract:
1. A valve for placement in a tubular, comprising: a body having an axis, a proximate end and a distal end having a base and proximal and distal openings through the body and being adapted for sealing in a receptor hole; a shuttle adapted to be placed in the body and having an axis, proximate and distal ends and a hole transverse to the axis adapted to receive a shear pin, the hole being in proximity to the distal end; a first slidable seal between the body and the shuttle, the first slidable seal having a first area and being attached to the shuttle between the proximate end of the shuttle and the proximal opening through the body when the valve is an a closed position; a second slidable seal between the body and the shuttle, the second slidable seal having a second area and being rigidly attached to the body and being disposed between the proximal end of the body and the proximal opening in the body, the first slidable seal having an area greater than the area of the second slidable seal; a spring confined between the first slidable seal and the distal end of the body; and a shear pin adapted to the shear pin hole in the shuttle and a hole in the base of the body.