KR piston seal
KR is a double acting piston seal with square shape energizer. It is suitable to be used in short stroke application.
The Ultrathan piston sealing set profile KR complements the product range of double-acting piston seals (OE, OK) for installation housings according to ISO 7425/1 by a product which is preferably used in the pressure range up to a maximum of 300 bar.
The seal components are a slide ring consisting of a newly developed polyurethane with improved sliding qualities and an especially high module and a leader element with rectangular cross-section made of an NBR-elastomere.
FEATURES
Exceptionally high static and dynamic sealing performance.
Good sealing performance in extremely small assembly conditions.
Can also be used for single-acting applications.
Robust seal profile for harshest operating conditions.
Extreme wear resistance.
Long service life thanks to applicationoptimized compounds.
Constantly low dynamic friction throughout the part‘s service life.
Easy snap assembly on a single-part piston.
Insensitive to pressure peaks.
Functional reliability at critical temperatures.
High extrusion resistance.
Dimensions according to ISO 7425-1.
Short axial assembly length.
Installation in closed and undercut housings.
Range of application
The KR profile is suitable for use in all standard industrial cylinders as well as in farming equipment, light construction machinery and mobile devices. Due to the exceptionally high dynamic sealing performance, it is particularly 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.
| OD | ID | L |
| 20 | 12.5 | 3.2 |
| 25 | 14 | 4.2 |
| 25 | 16 | 4.2 |
| 25 | 17.5 | 3.2 |
| 28 | 20.5 | 3.2 |
| 30 | 19 | 4.2 |
| 30 | 22.5 | 3.2 |
| 32 | 21 | 4.2 |
| 32 | 24.5 | 3.2 |
| 35 | 27.5 | 3.2 |
| 36 | 25 | 4.2 |
| 40 | 24.5 | 6.3 |
| 40 | 27 | 6.3 |
| 40 | 29 | 4.2 |
| 40 | 32.5 | 3.2 |
| 45 | 32 | 6.3 |
| 45 | 34 | 4.2 |
| 50 | 34.5 | 6.3 |
| 50 | 37 | 6.3 |
| 50 | 39 | 4.2 |
| 55 | 39.5 | 6.3 |
| 55 | 44 | 4.2 |
| 58 | 45 | 6.3 |
| 60 | 44.5 | 6.3 |
| 60 | 49 | 4.2 |
| 63 | 47.5 | 6.3 |
| 63 | 50 | 6.3 |
| 63 | 52 | 4.2 |
| 63 | 53 | 5 |
| 65 | 49.5 | 6.3 |
| 65 | 52 | 6.3 |
| 65 | 54 | 6.3 |
| 70 | 54.5 | 6.3 |
| 70 | 57 | 6.3 |
| 70 | 59 | 4.2 |
| 75 | 59.5 | 6.3 |
| 75 | 62 | 6.3 |
| 75 | 64 | 4.2 |
| 80 | 59 | 8.1 |
| 80 | 59 | 10.5 |
| 80 | 64.5 | 6.3 |
| 80 | 66.5 | 6.3 |
| 80 | 69 | 4.2 |
| 85 | 69.5 | 6.3 |
| 85 | 71.5 | 6.3 |
| 90 | 69 | 8.1 |
| 90 | 69 | 10.5 |
| 90 | 74.5 | 6.3 |
| 95 | 79.5 | 6.3 |
| 100 | 79 | 8.1 |
| 100 | 84.5 | 6.3 |
| 100 | 86.5 | 6.3 |
| 105 | 84.5 | 6.3 |
| 105 | 89.5 | 6.3 |
| 110 | 89 | 8.1 |
| 110 | 89 | 10.5 |
| 110 | 94.5 | 6.3 |
| 115 | 94 | 8.1 |
| 120 | 99 | 8.1 |
| 120 | 99 | 10.5 |
| 120 | 104.5 | 6.3 |
| 125 | 104 | 8.1 |
| 125 | 104 | 10.5 |
| 125 | 109.5 | 6.3 |
| 140 | 119 | 8.1 |
| 140 | 119 | 10.5 |
| 140 | 119 | 12.5 |
| 140 | 129 | 10.5 |
| 160 | 139 | 8.1 |
| 180 | 159 | 8.1 |
| 200 | 175 | 12.5 |
| 200 | 179 | 8.1 |