The Parker Prädifa Ultrathan® piston sealing set KR complements the product range of double-acting piston seals (OE, OK) for grooves according to ISO 7425-1 by a product which is preferably used in the medium-duty pressure range up to a maximum of 300 bar. The sealing set stands out by its extreme wear resistance and exceptionally high static and dynamic sealing performance and can also be used for piston accumulators.
The KR sealing set consists of a polyurethane slide ring with improved sliding properties and particularly high modulus and an energizer with a rectangular cross-section made of an NBR elastomer.
- Exceptionally high static and dynamic sealing performance.
- Good sealing performance in an extremely small assembly
- Can also be used for single-acting
- Robust seal profile for harshest operating conditions.
- Extreme wear
- Long service life thanks to application-optimized
- Constantly low dynamic friction throughout the part‘s service
- Easy snap assembly on a single-part piston.
- Insensitive to pressure
- Functional reliability at critical tempera-
- High extrusion resistance.
- Dimensions according to ISO 7425-1.
- Short axial assembly
- Installation in closed and undercut
Range of application
The Parker Praedifa KR piston sealing set is suitable for use in all standard industrial cylinders, farming equipment, light construction machinery, and mobile devices. Due to its exceptionally high dynamic sealing performance, it is particularly well suited for leakage-critical applications.
Operating pressure ≤ 300 bar
Operating temperature -35 °C to +110 °C
Sliding speed ≤ 0.5 m/s
Compounds
Slide ring: Ultrathan® P5062, modified polyurethane with a hardness of approximately 55 Shore D.
Expander ring: NB078, NBR-elastomer with a hardness of approximately 80 Shore A.
Installation
The installation groove must be carefully deburred and cleaned. The cylinder bore must have a leading-edge chamfer. Profile KR can be snapped into closed grooves.
| D | d | L | D1 | ISO1) | Order code | D | d | L | D1 | ISO1) | Order code | |
| 20 | 12.5 | 3.2 | 19.7 | KR002000701 | 75 | 59.5 | 6.3 | 74.6 | KR007500701 | |||
| 25 | 14 | 4.2 | 24.7 | – | KR102500701 | 75 | 62 | 6.3 | 74.6 | KR207500701 | ||
| 25 | 16 | 4.2 | 24.7 | KR202500701 | 75 | 64 | 4.2 | 74.7 | KR107500701* | |||
| 25 | 17.5 | 3.2 | 24.7 | KR002500701 | 80 | 59 | 8.1 | 79.5 | KR208000701* | |||
| 28 | 20.5 | 3.2 | 27.7 | KR002800701* | 80 | 59 | 10.5 | 79.5 | KR308000701* | |||
| 30 | 19 | 4.2 | 29.7 | KR103000701* | 80 | 64.5 | 6.3 | 79.6 | – | KR008000701 | ||
| 30 | 22.5 | 3.2 | 29.7 | KR003000701* | 80 | 66.5 | 6.3 | 79.6 | KR108000701 | |||
| 32 | 21 | 4.2 | 31.7 | – | KR103200701 | 80 | 69 | 4.2 | 79.7 | – | KR408000701 | |
| 32 | 24.5 | 3.2 | 31.7 | – | KR003200701 | 85 | 69.5 | 6.3 | 84.7 | KR108500701* | ||
| 35 | 27.5 | 3.2 | 34.7 | KR003500701* | 85 | 71.5 | 6.3 | 84.6 | KR008500701 | |||
| 36 | 25 | 4.2 | 35.7 | KR003600701* | 90 | 69 | 8.1 | 89.5 | KR109000701 | |||
| 40 | 24.5 | 6.3 | 39.6 | KR104000701* | 90 | 69 | 10.5 | 89.5 | KR209000701 | |||
| 40 | 27 | 6.3 | 39.6 | KR204000701* | 90 | 74.5 | 6.3 | 89.6 | KR009000701 | |||
| 40 | 29 | 4.2 | 39.7 | – | KR004000701 | 95 | 79.5 | 6.3 | 94.6 | KR009500701 | ||
| 40 | 32.5 | 3.2 | 39.7 | – | KR304000701 | 100 | 79 | 8.1 | 99.5 | KR210000701 | ||
| 45 | 32 | 6.3 | 44.6 | KR104500701 | 100 | 84.5 | 6.3 | 99.6 | – | KR010000701 | ||
| 45 | 34 | 4.2 | 44.7 | KR004500701 | 100 | 86.5 | 6.3 | 99.6 | KR110000701 | |||
| 50 | 34.5 | 6.3 | 49.6 | – | KR105000701 | 105 | 84.5 | 6.3 | 104.6 | KR210500701 | ||
| 50 | 37 | 6.3 | 49.6 | KR205000701* | 105 | 89.5 | 6.3 | 104.6 | KR010500701 | |||
| 50 | 39 | 4.2 | 49.7 | – | KR005000701 | 110 | 89 | 8.1 | 109.5 | KR111000701 | ||
| 55 | 39.5 | 6.3 | 54.6 | KR105500701 | 110 | 89 | 10.5 | 109.5 | KR211000701* | |||
| 55 | 44 | 4.2 | 54.7 | KR005500701* | 110 | 94.5 | 6.3 | 109.6 | KR011000701* | |||
| 58 | 45 | 6.3 | 57.6 | KR005800701* | 115 | 94 | 8.1 | 114.5 | KR011500701 | |||
| 60 | 44.5 | 6.3 | 59.6 | KR106000701 | 120 | 99 | 8.1 | 119.5 | KR212000701 | |||
| 60 | 49 | 4.2 | 59.7 | KR006000701 | 120 | 99 | 10.5 | 119.5 | KR112000701 | |||
| 63 | 47.5 | 6.3 | 62.6 | – | KR206300701 | 120 | 104.5 | 6.3 | 119.6 | KR012000701* | ||
| 63 | 50 | 6.3 | 62.6 | KR306300701 | 125 | 104 | 8.1 | 124.5 | – | KR112500701 | ||
| 63 | 52 | 4.2 | 63.7 | – | KR006300701 | 125 | 104 | 10.5 | 124.5 | KR212500701 | ||
| 63 | 53 | 5 | 62.7 | KR106300701* | 125 | 109.5 | 6.3 | 124.6 | – | KR012500701 | ||
| 65 | 49.5 | 6.3 | 64.7 | KR206500701* | 140 | 119 | 8.1 | 139.5 | KR214000701 | |||
| 65 | 52 | 6.3 | 64.6 | KR006500701 | 140 | 119 | 10.5 | 139.5 | KR014000701* | |||
| 70 | 54.5 | 6.3 | 69.6 | KR107000701 | 140 | 119 | 12.5 | 139.5 | KR114000701* | |||
| 70 | 57 | 6.3 | 69.6 | KR207000701 | 150 | 129 | 10.5 | 149.5 | KR015000701* | |||
| 70 | 59 | 4.2 | 69.7 | KR007000701 | 160 | 139 | 8.1 | 159.5 | – | KR016000701 |
| D | d | L | D1 | ISO1) | Order code |
| 180 | 159 | 8.1 | 179.5 | KR018000701* | |
| 200 | 175 | 12.5 | 199.5 | – | KR120000701* |
| 200 | 179 | 8.1 | 199.5 | – | KR020000701 |
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