Patent ID: 8403052

Claim:
A flow control screen having a fluid flow path between an interior of a base pipe and a filter medium, the flow control screen comprising: a valve assembly disposed within the fluid flow path including a piston body, a valve plug and a ball retainer having an opening, the piston body having an internal seat and a collet assembly that is radially outwardly constrained by the ball retainer in a first operating position to retain the valve plug in the piston body and radially outwardly unconstrained by the ball retainer in a second operating position; and a c-ring positioned around the ball retainer operable to prevent reentry of the valve plug into the valve assembly, wherein an internal differential pressure seats the valve plug on the internal seat to prevent reverse flow; wherein a predetermined internal differential pressure on the valve plug causes the piston body to shift from the first operating position to the second operating position while continuing to prevent reverse flow; and wherein, in the second operating position, an external differential pressure causes the valve plug to be expelled from the valve assembly through the opening of the ball retainer, thereby no longer preventing reverse flow.