Request for Quote - Piston Rings and Rider Bands

Rider Bands
In addition to piston rings, CECO offers a complete line of rider rings, manufactured to meet your application requirements - in the materials you need. Typically used to prevent piston-to-cylinder contact, CECO's rider rings, manufactured of high quality blended Resilon-T™, outperform other ring materials for use in both lubricated and non-lubricated service. Like piston rings, rider rings are available with straight, angle or step cut gaps, in one-piece, two-piece and multi-piece configurations. Cut rider rings are manufactured with side relief grooves, another CECO standard. They are also available as solid, uncut rings for an interference fit in the rider ring groove for use in applications where rider rings might encounter valve ports or counterbores.

Multiple Ring Assemblies
A three-piece assembly consists of two outer rings, with either straight or angle cuts, assembled on a common inner ring or expander wide enough to accommodate both outer rings. This assembly provides effective sealing in both directions. These unidirectional multiple sealing rings provide high-performance sealing at pressures typical of polyethylene compressors. The assembly is made up of a single straight-cut ring and a two-piece ring composed of an inner and outer ring both normally straight cut. The inner ring functions as both an expander and gap seal for the outer ring.

Installation of Solid Rider Rings
Solid rider rings are machined with an interference fit so that, once expanded over the piston end, they contract like a rubber band providing a snug fit on the piston. Unlike piston rings which must move freely in their grooves to seal, rider rings are literally stretched in order to slide them over the end of the piston and into the rider groove. For easier installation, CECO furnishes rider rings which are pre-stretched, mounted on groove-locked expanders to fit over the piston head. Once in the ring groove, Resilon-T's natural elastic memory causes the ring to contract to its original dimensions. Unstretched rider rings are also available for force-fit installation over a piston head.