PetroQuip’s Annular Production Control Valve (APCV™) sliding sleeve is a premium mechanical sliding sleeve that is mounted in the production tubing, controlling communication between the tubing and the annulus. The sleeve is designed to function in a vertical or deviated well utilizing patented non-elastomeric seals. These proprietary seals gives the sleeve the ability to be opened at high differential pressures without damaging the sealing integrity of the APCV.