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Aavolyn # 60-21103-024, AVA47 TY211 Packing Ring

The Type 211 pair of packing rings consist of two tangent to the step rings pinned together to overlap at the step. This design has traditionally been used to seal low pressure or vacuum applications. The pair of tangent rings allows the 211 style to seal in both directions. Because of the large sealing surface, more frictional heat is generated and therefore greater wear to the piston rod and the seal itself. The 211 design does not allow gas to pass back through the packing case when pressure drops from discharge to suction in the cylinder, therefore its application should be limited to low pressures such as after the vent connection, vacuum service or in partition packings.


Cylinder/ Rod Diameter




Material Description

AVA47 provides exceptional long life in those applications where there are hydrocarbons or liquids flowing intermittently in the gas. Standard carbon filled PTFE rings depend on riding over a coating of PTFE on the rod or the cylinder to provide minimal ring wear. In applications where solids or liquids are present and tend to remove the coating provided by standard carbon filled, AVA47 is the material of choice. By adding anti-friction materials, excellent ring life is achieved along with eliminating wear on the piston rod, piston or cylinder wall.
Recommended Applications: Lubricated Service, Wet CO2, Natural Gas, Vinyl Chloride

AVA47 Application Profile.
AAVOLYN's AVA47 PTFE blend profiled by E.I. duPont.

AVA47 filled PTFE - This proprietary material is ideally suited for lubricated and mini-lube service, especially where solids and liquids are prevalent in the gas stream. Piston rings, rider rings and rod packing manufactured from AVA47 have outperformed the standard material available in the Natural Gas Market today.