The single-acting Parker Prädifa pneumatic complete piston DE is a two-component seal design, consisting of a metallic carrier with a vulcanized guiding surface and sealing lip. The complete piston performs two functions: sealing and guiding.

• Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
• Immediate response (full pressure load) thanks to incorporated venting channels.
• Good wear resistance.
• Ideal corrosion protection thanks to complete elastomer covering.
• Smooth running due to the optimum lubricant-retaining sealing lip geometry.
• Easy attachment to the piston rod without additional sealing elements.
• Easy installation due to integrated static sealing function.
• Excellent media resistance in case of suitable compound selections.
• Also available as a double-acting version.
• The low assembly height of the complete piston enables the short cylinder designs.
• Versatile complete piston for nearly all cylinder designs.

Range of application

Complete piston for single-acting pneumatic cylinders with and without end position cushioning, provided that no excessive lateral guidance loads will occur (long strokes and buckling).

Compounds

The standard compound is an elastomer (NBR-based) with a hardness of approx. 71 Shore A and vulcanized to a metal disc, resp. 78 Shore A for diameters > 100 mm.

Installation

The Parker Praedifa profile EK complete piston is fixed to the piston rod with a locknut to avoid loosening. For use with dry and oil-free air, the piston and cylinder tube must be relubricated with a suitable long-life lubricant.

It must be assured that the sealing lips do not touch the cylinder bottom and the cylinder cap at the limit stops (see also dimension „Ø dm“).