Design and Fitting Instructions

Fitting Piston Seal MRA, SRA, MRR-A

To facilitate assembly we recommend:
Greasing and/or oiling of sliding surfaces and seals (do not use lubricants with solid additives). Heating of externally sealing PTFE rings in oil or hot water up to 80 °C to 120 °C.

1. Assembly of piston rings with expansion sleeve
Montage der Kolbenringe mit einer Spreizhülse

2. Calibrating the piston ring with a sleeve
Kalibrieren des Kolbenringes mit einer Hülse

Fitting Instructions

  • Insert O-ring into groove
  • Slide composite seals onto fitting shell using expander
  • If necessary, we recommend subsequent calibration using a sleeve
  • Let composite seal snap into groove
  • To assist with making the fitting tools, we will be happy to provide respective drawings
Fitting Rod Seal MRI, SRI, MRR-B
Fitting Instructions
For rod diameters below 30 mm use axially accessible grooves.

For rod diameters above 30 mm the seals may be installed in the closed grooves.

  • Inset O-ring into groove
  • Compress composite seal into a "kidney" shape and insert into groove
  • If necessary, we recommend subsequent calibration, using a mandrel

Design of contact surfaces
  Dynamic contact surface/rod Static groove diameter/housing
Rz   ≤ 1,0 µm ≤ 6,3 µm
Rmax   ≤ 2,0 µm ≤ 12,5 µm