The self-retaining Parker Prädifa pneumatic rod seal/wiper set profile E8 for piston rods in pneumatic cylinders combines three functions:

Sealing, wiping, fixing. The split design of the sealing set allows the optimal adaptation of the materials to the requirements of the individual component (wiper and/or seal).

• Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
• Bi-functional element: seal and wiper.
• Good wear resistance.
• No risk of corrosion since the combined retainer and wiper part eliminates the need for additional wire circlips.
• Long service life due to coordinated geometries of the functional lips and compound selection.
• Smooth running due to the optimum lubricant-retaining sealing lip geometry.
• High-temperature resistance in case of suitable compound selection.
• Excellent media resistance in case of suitable compound selection.
• Product geometry prevents dirt deposits at the front face of the cylinder.
• Identical housing for E7, E8, E9, EU, EF, EN, EW, and ET.
• Installation in open housings.
• The coordinated geometries of the seal and wiper lips achieve favorable friction coefficients and long service life.

Range of application

Compounds

The sealing part of the profile E8 pneumatic rod seal/wiper is made of a special SFR® elastomer N3580 (NBR-based) with a hardness of approx. 80 Shore A.

This compound has excellent running properties, especially in the semi-frictional area. The profile EA fixing/scraping part is made of the highly wear-resistant W5035 plastic material.

Installation

The Parker Praedifa pneumatic profile E8 rod seal/wiper set is fitted into the housing by means of a circlip recess according to DIN 7993 (type B). The sealing part is pushed in and fixed by the EA retainer/wiper, which snaps in easily. During assembly, care should be taken to ensure that neither the scraper nor the sealing lips be damaged by sharp edges.

In case the seal/wiper set needs to be exchanged, this can be accomplished without removing the piston rod if a dismantling recess has been provided for.