The double-acting Parker Prädifa DK pneumatic piston is a two-component seal design consisting of a metallic supporting element with a vulcanized guiding ridge and sealing lips. 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 optimum adjustment of the functional lips.
• 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 selection.
• 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 double-acting pneumatic cylinders with and without 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.

For high and/or low-temperature applications special compounds are available. Available sizes in the polyurethane compound P5008 are listed separately.

Installation

The Parker Praedifa profile DK pneumatic 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“).