Symmetrical Seal XSPRS25-27

Function:
Symmetrical piston/rod seals are designed to seal the pressurized hydraulic fluid against the atmosphere or between two pressurized spaces.

Features:

  • Symmetrical, single acting piston/rod seal, combined with pressure ring and supporting ring.
  • Special lip geometry for packings out of PTFE or other non elastic materials.
  • By adjusting the number of packings friction and leakage characteristics can be influenced.
  • Designed for low pressure ranges up to 100 bar.
  • Excellent static and dynamic sealing performance.
  • Useable for short and long stroke lengths.
  • High wear resistance.

  • Reciprocating pistons/rods in hydraulic cylinders, plungers, etc. in the pharma, chemical or food industry
  • High temperature applications.
  • Max. pressure 100 bar, max. speed 1.5 m/s.

Tolerances [mm]   
L < 10 mm
+ 0,2  
L ≥ 10 mm
+ 0,3  
∅ NA (rod groove)
H 10  
∅ NI (rod diam.)
f 8  
∅ NA (cylinder diam.)
H 9  
∅ NI (piston groove)
h 10  
 
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

Open housings are recommended.

The axial contact force on the individial parts usually is generated by a spring element.