Parker Prädifa PP

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The Parker Prädifa Ultrathan® PP cushioning ring is used for sealing cushioning pistons in pneumatic cylinders in the end position. By means of the sealing lip, its special shape provides sealing toward the cushioning piston and concurrently acts as a valve during the return stroke. The combination of geometry and material ensures high wear resistance.

  • No mechanical check valves required since their function is performed by the cushioning rings.
  • High cushioning consistency due to automatic centering, even in the case of misalignment of the cushioning spear and the cylinder head.
  • Optimum use of design-related cushion travel.
  • Robust seal profile for harshest operating conditions.
  • Immediate response to reversed direction thanks to incorporated venting channels.
  • Extreme wear resistance.
  • Easier installation.
  • Excellent media resistance in case of suitable compound selection.
  • Installation in closed housings.

Range of application

For pneumatic cylinders with end-position cushioning.

Operating pressure ≤ 16 bar 1)
Operating temperature PP NBR N3589

PP TPU P5008

-20 °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)
1) Higher pressure peaks during cushioning process are considered.

Compounds

NBR and FKM version

Standard: N3589, NBR compound (≈ 85 Shore A).

For low temperatures: N8613, NBR compound (≈ 80 Shore A). For high temperatures: V3839, FKM compound (≈ 90 Shore A). PUR version

Standard: P5008, PUR compound (≈ 94 Shore A).

For low temperatures: P5009, PUR compound (≈ 94 Shore A).

Installation

The Parker Praedifa profile PP cushioning seals are easily snapped into the groove, which should be free of all contaminants and foreign particles before installation. Care should be taken that the sealing lips are not damaged by sharp edges during installation.

Initial lubrication is essential for very long service life.

d D H h Da D1 D2 L Order code
PPNBRN3589
5 9 4.1 3.2 8.7 5.5 7 3.7 PP0509N3589
6 10 4.1 3.2 9.7 6.5 8 3.7 PP0610N3589
8 11.6 3.5 2.8 11.3 8.5 10 3.3 PP0811N3589
9.5 15 4.6 3.7 14.7 10 12 4.5 PP0915N3589
10 18 7.8 6.3 17 10.5 15 7 PP1018N3589
12 18 5 4.1 17.8 13 15.5 4.8 PP1218N3589
12 20 7.8 6.3 19.1 13 17 7 PP1220N3589
14 22 7.8 6.3 21.1 15 19 7 PP1422N3589
16 22 5.5 4.5 21.5 17 19.5 5.2 PP1622N3589
16 24 7.8 6.3 23.1 17 21 7 PP1624N3589
18 26 7.8 6.3 25.1 19 23 7 PP1826N3589
20 28 7.8 6.3 27.1 21 24 7 PP2028N3589
22 30 7.8 6.3 29.1 23 26 7 PP2230N3589
25 33 7.8 6.3 32.1 26 29 7 PP2533N3589
28 36 7.8 6.3 35.1 29 32 7 PP2836N3589
30 40 7.8 6.2 39.1 31.5 35 7 PP3040N3589
32 42 7.8 6.2 41.1 33.5 37 7 PP3242N3589
36 46 7.8 6.2 45.1 37.5 41 7 PP3646N3589
40 50 7.8 6.2 49.1 41.5 45 7 PP4050N3589
50 60 7.8 6.2 59.1 51.5 55 7 PP5060N3589
50 67 11 11 66.2 53 58 12.5 PP5067N3589
57 74 11 11 73.2 60 65 12.5 PP5774N3589
70 87 11 11 86.3 73 78 12.5 PP7087N3589
78 95 11 11 94.3 81 86 12.5 PP7895N3589
PPTPUP5008
8 11.6 3.5 2.8 11.1 8.5 10 3.3 PP0811P5008
9.5 15 4.6 3.7 14.7 10 12 4.5 PP0915P5008
12 18 5 4.1 17.8 13 15.5 4.8 PP1218P5008
14 22 7.8 6.3 21.05 15 19 7 PP1422P5008
16 22 5.5 4.5 21.5 17 19.5 5.2 PP1622P5008
16 24 7.8 6.3 23.1 17 21 7 PP1624P5008
18 26 7.8 6.3 25.1 19 23 7 PP1826P5008
20 28 7.8 6.3 27.1 21 24 7 PP2028P5008
22 30 7.8 6.3 29.1 23 26 7 PP2230P5008
25 33 7.8 6.3 32.1 26 29 7 PP2533P5008
28 36 7.8 6.3 35.1 29 32 7 PP2836P5008
30 40 7.8 6.3 39.1 31.5 35 7 PP3040P5008
32 42 7.8 6.2 41.1 33.5 37 7 PP3242P5008
36 46 7.8 6.2 45.1 37.5 41 7 PP3646P5008
40 50 7.8 6.2 49.1 41.5 45 7 PP4050P5008
50 60 7.8 6.2 59.1 51.5 55 7 PP5060P5008
57 74 11 11 73.2 60 65 12.5 PP5774P5008
78 95 11 11 94.3 81 86 12.5 PP7895P5008

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Parker

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