The Sentry 4S-CS Seal Assembly is a secondary seal assembly that features both O.D. and I.D. seals. It consists of reducer bushing body, (2) CS Seals in the I.D. of the bushing accompanied by (2) S-Seals on the O.D. A single snap ring also retains the bushing in the secondary seal area of a casing spool or tubing head.
This design consists of two “CS” seals located in the I.D. of the reducer bushing body and (2) “S” seals located on the O.D
A seal is achieved by interference of the seals on both the I.D. and O.D. of the seal assembly
A spring molded in each ID corner of the seal provides the anti‑extrusion mechanism when sealing against the casing O.D or the secondary seal area in the casing spool or tubing head
The shape of the seal allows it flexibility to maintain interference with normal manufactured tolerances of the casing O.D
Is utilized in the bottom of a casing spool or tubing head that already has no seals in the secondary seal area