The double-acting Parker Prädifa DP 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 three functions: sealing, guiding, and end-position cushioning.

• Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
• Cushioning buffers on the piston´s front faces with integrated ventilation ducts provide for mechanical cushioning of the cylinders.
• Multi-functional element: seal, guiding, and cushioning element.
• 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 selections.
• 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 with end cushioning for double-acting pneumatic cylinders provided that no excessive lateral guidance loads will occur (long strokes and buckling).

Compounds

The standard compound is an NBR-based elastomer with a hardness of approx. 71 Shore A and vulcanized to a metal disc.

Installation

The Parker Praedifa profile DP pneumatic complete piston should be 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.