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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