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Aavolyn # 60-21502-017, AVA47 TY215 Wedge Packing Ring

This design, used in a wiper packing assembly, consists of a three ring set; a male radial ring, female radial ring and tangent cut ring as shown above. The wedge packing set is installed facing the cylinder with the female radial ring facing the pressure. The purpose of the wedge packing is to prevent the gas from getting into the crankcase.

It can also be utilized in very low pressure applications where the radial tangent pair does not exert sufficient force on the piston rod to create a seal. The male/female combination load ring creates sufficient force on the rod with the expansion of the PTFE material due to a temperature increase at operating pressure. This pressure allows the ring to seal where the normal downward force of the gas on the packing ring is not sufficient.

3 piece Wedge Packing Ring






Specifications

Cylinder/ Rod Diameter
2.500

Material
AVA47

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.