Parker Prädifa Piston Seals KR

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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

Merk

Parker

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