Back-up Rings

Protecting non-metallic sealing rings

  • Protection of non-metallic sealing rings from extruding
  • Allows the use of PTFE as a sealing ring at high pressures
  • Materials available for all fields of applications

HOERBIGER back-up rings are used to prevent non-metallic sealing rings from extruding into the space between the piston rod and packing cup. Back-up rings, which are typically made of cast iron or bronze material, seal only the end face of the packing case cup. The bore hole has a small clearance from the piston rod. They are suitable for all fields of application in the process, natural gas, or food industry.

Technical data

Back-up rings imperial metric
Piston rod diameter (in / mm) 0.78 to 7.8 20 to 200
Operating pressure range (psi / bar) 43.5 to 14,500 3 to 1,000