Piston Seal XSPS81B

Function:
Piston seals are designed to seal the pressurized hydraulic fluid against
the atmosphere or between two pressurized spaces.

Eigenschaften:
  • Asymmetrical, single acting piston seal, designed with interference
    of the preload element on the ID and slight interference of the PTFE
    glide ring on the OD.
  • High pressure force because of a machined rubber preload element.
  • Less relative movement of the rubber part compared to an O-Ring
    giving the seal a higher wear resistance.
  • Excellent sealing performance in low and high speeds.
  • Suitable for positioning functions.
  • Negligible tendency to “stick-slip” effect, good sliding properties.
  • Low break-away load after long standstills.
  • Excellent gap extrusion resistance.
  • Can be used in grooves where no O-Ring is possible.

Max. allowable gaps (PTFE Compounds):

Profile dimension16 MPa26 MPa32 MPa40 MPa
10,0 mm0,60 mm0,50 mm0,40 mm0,40 mm
>12,5 mm ... ≤17,5 mm0,75 mm0,65 mm0,55 mm0,55 mm
20,0 mm0,80 mm0,70 mm0,60 mm0,55 mm

Application:

  • Reciprocating pistons in hydraulic cylinders, plungers in heavy-duty applications.
  • Max. pressure 400 bar, max. speed 10 m/s.

Seal housing recommendation:

Tolerances[mm]  
L < 10 mm
+ 0,2 
L ≥ 10 mm
+ 0,3 
∅ NA
H8 
∅ NI
h8 
 
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.

Attention: PTFE glide rings need calibration after installation!