Back-up Ring XSBUR08

Function:
Back-up rings do not have a sealing function. They are designed to prevent elastic sealing elements such als O-Rings or Quad Rings of gap extrusion.

Features:

  • Normally cut at an angle for easy installation, but also available as non-split version.
  • Low dynamic friction.
  • Low break-away forces after long standstills.
  • Activated back-up rings reduce gap extrusion and prevent twisiting of the seal in the groove.

  • Dynamic an static application in reciprocating pistons an rods in hydraulic cylinders, plungers, etc.
  • Unfavourable tolerances and wide gap dimensions.
  • Intensely pulsating pressures and pressure change.

Tolerances [mm]   
L < 10 mm
+ 0,2  
L ≥ 10 mm
+ 0,3  
∅ NA
H8  
∅ NI
h9  
 
Surface roughness Rtmax [ µ]  Ra [ µ] 
Bottom of groove
≤ 6,3 ≤ 1,6
Face of groove
≤ 15 ≤ 3
 
Sliding surface Rtmax [ µ]  Ra [ µ] 
PU, elastormeres
≤ 2,5 ≤ 0,1 - 0,5
PTFE
≤ 2 ≤ 0,05 - 0,3

Snap-in installation, split or unsplit.