The Advancap™ rod and piston seals are designed to provide a cost-effective cap seal solution that prevents extrusion and eliminates O-ring spiral failure in dynamic applications. Each seal combines a cap made from Avalon®, our PTFE material, with an elastomeric energizer, and is available in configurations for zero, one or two back-up ring glands per AS4716. Custom configurations are also available.
The Advancap can replace low-friction, O-ring swivel seals that leak, nibble and/or exhibit excessive friction.
The addition of any cap to an O-ring gland will increase O-ring squeeze and gland occupancy. This may result in excessive friction, unsatisfactory service life or installation difficulty. By modifying the gland diameter, as shown in the table above, these problems can be alleviated without reducing O-ring squeeze below the minimum per AS4716.
Notches—Blow By Protection
Both piston and rod type Advancaps can be supplied with notches for blow by protection, in accordance with SAE AIR 1243.
Circumferential grooves can be added to the Advancaps to provide better dynamic sealing. The grooves will retain lubricant that enhances start-up performance by releasing lubricant to the sliding surfaces as the surface moves.
The part numbering system requires the use of the material designator tables found in the next column. For nonstandard designs contact GT engineering.