Parker Prädifa Piston Seals DK

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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).

Operating pressure ≤ 16 bar
Operating temperature DK NBR Z5051

DK TPU Z5071

 

-30 °C to +80 °C

-35 °C to +80 °C

Sliding speed ≤ 1 m/s
Media Compressed air, both lubricated and oil-free (after greasing for fitting)

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“).

D d H Order code D d H Order code
DKNBRZ5051
16 5 12 DK1631Z5051 150 20 29 DKF020Z5050
20 5 12 DK2030Z5051 160 27 29 DKG027Z5050
20 6 12 DK2031Z5051 160 30 29 DKG030Z5050
25 6 12 DK2506Z5051 200 27 35 DKL027Z5050
25 8 12 DK2508Z5051 200 30 35 DKL030Z5050
25 8 12 DK2509Z5051 250 30 40 DKN131Z5050
32 5 18 DK3205Z5051 250 30 40 DKN130Z5050
32 6 15 DK3206Z5051 DKTPUZ5071
32 8 15 DK3207Z5051 32 8 15 DK3207Z5071
32 8 15 DK3210Z5051 40 10 18 DK4009Z5071
35 8 15 DK3508Z5051 50 10 18 DK5010Z5071
40 8 18 DK4007Z5051 63 16 21.5 DK6316Z5071
40 8 20 DK4008Z5051 63.5 11.12 22 DK6323Z5071
40 10 18 DK4009Z5051
50 8 20 DK5008Z5051
50 10 18 DK5010Z5051
50 16 20.5 DK5016Z5051
60 12 21 DK6012Z5051
60 18 21 DK6018Z5051
63 12 22 DK6312Z5051
63 16 21.5 DK6316Z5051
70 12 22 DK7012Z5051
70 33 22 DK7033Z5051
80 12 22.5 DK8013Z5051
80 16 22.5 DK8016Z5051
80 20 22.5 DK8020Z5051
100 12 25 DKA012Z5051
100 16 25 DKA016Z5051
100 20 26 DKA019Z5051
125 20 26 DKC520Z5050
125 20 28 DKC522Z5050
130 20 29 DKD020Z5050
140 22 29 DKE022Z5050

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