When to Use Back-Up Rings
- System operating pressure exceeds the limitations of the seal’s extrusion resistance.
- Pressure spikes in the system exceed normal operating conditions,risking damage to the seal.
- The use of wear rings has increased the extrusion gap, reducing the seal’s pressure rating to an unacceptable level.
- The system temperature is high enough to lower the seal’s extrusion resistance to an unacceptable level.
- R0 (Virgin PTFE)
- R1 (Nylatron)
- R12 (PEEK)
- P0 (Virgin PTFE)
- P1 (Nylatron)
- P12 (PEEK)