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.

Application

  • 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.

    • Seal housing recommendation

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

    Installation

    Snap-in installation, split or unsplit.