Back-up Ring XSBUR09

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

Features:
  • Especially designed for use with O-Rings.
  • Improved formstability of the elastomer O-Ring. Bigger contact area of the O-Ring compared to XSBUR08 creates in less deformation.
  • 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 twisting of the seal in the groove.

Application

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

Seal housing recommandation

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.