TL171 Series Spiral Back-Up
TL171″ Series Spiral Back-up Rings The TL171 PTFE spiral back-up rings are proven components used for sealing both low and high pressure systems. Any system pushing the pressure limits on an elastomer seal, TL171 back-up rings are an inexpensive option to increase seal pressure capabilities or increase radial extrusion gaps behind the seal.
The TL171 spiral back-up rings come standard in T-LON® 01 (Virgin PTFE) and are considered the premium back-up ring compared to the split and solid back-up rings. They have the assembly ease of the split rings and the reliability of the solid rings (no extrusion gap that causes o-ring extrusion or nibbling).
Consider TL171 spiral back-up rings with elastomer o-rings under the following conditions:
- Pressure above 1000psi (7MPa)
- Radial Extrusion gap > .005″ (.13mm)
- High Reciprocating Stroke Frequency
- High Temperatures
- Medium with Contamination
- Pressure Shock Loads (Fast Pressure Changes)
Advantages:
- Inexpensive option
- Easy to install with the reliability of a solid back-up ring
- Increase pressure rating of standard o-rings
- Available for cylinders up to 45″ diameter
Applications:
- Mobile Hydraulic Cylinders
- Pneumatic Piston Cylinders
- Agriculture Equipment
- Hydraulic Valves and Pumps
- Filling Machines
- Testing Machinery
- Any sealing application
Technical Data for PTFE compounds:
(1) Temperature Range: -400° to 500°F
(2) T-LON® seal compound determines allowable pressure
- Pressure: Up to 5800 psi (Function of e-gap and T-LON® compound)
- Surface Speed: Up to 6 ft/s
Most Common:
Virgin PTFE (“01”)
- Most cost effective
- Flexible for assembly ease