Parker Prädifa Rotary Seals KA

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The Parker Prädifa KA rotary sealing set is a compact seal for sealing the high-pressure channels of rotary transmissions. It consists of a rubber element with a fabric-reinforced running surface and two anti-extrusion rings. They increase stability and prevent extrusion into the gap which due to the rotary motion (eccentricity)  is variable in most cases. Due to the special shape of the dynamic sealing area, a lubricant deposit is formed which ensures the preservation of the liquid film and thereby prevents dry running.

  • Enhanced sealing performance in non-pressurized conditions.
  • Robust seal profile for harshest operating conditions.
  • Extreme wear resistance.
  • Insensitive to pressure peaks.
  • High-temperature resistance in case of suitable compound selection.
  • Extremely high extrusion resistance.
  • Installation in closed and undercut housings.

Range of application

Mainly for applications where the pressure alternates from one side of the seal to the other, such as pivots for rotating track rings, swivel joints, hose reels, and in machine tool hydraulics.

Operating pressure

≤ 60 °C                                                            ≤ 400 bar

≤ 80 °C                                                            ≤ 315 bar

≤ 100 °C                                                         ≤ 250 bar

Operating temperature                                    -30 °C to +100 °C

Sliding speed                                                    ≤ 0.2 m/s

Recommendation for rotary transmissions: P ∙ v ≤ 50

(For definition see catalog „Hydraulic Seals”, chapter „Rotary seals”, introduction.)

Compounds

The standard compound for the Paker Praedifa sealing part is an NBR-based elastomer with a fabric-reinforced dynamic surface (Z5011/Z5014). The back-up rings are made of a polyamide-based material.

Installation

The profile KA rotary sealing sets are designed to be snapped into closed grooves. Special versions for open grooves in end seal applications are available. During installation, first, the sealing part must be installed, followed by the back-up ring. To avoid damaging the seal, sharp edges within the installation area should be removed.

d D H L Order code
30 42 6 7 KA003000650
50 62 7.5 8.5 KA005000650
65 77 6 7 KA006500650
89 106 8.5 9.5 KA008900650
90 106 10 11 KA009200650
90 110 10 11 KA009000650
90 110 11 12 KA009100650
90 110 12 13 KA009300650
95 112 10 11 KA008700650
95 115 11 12 KA008800650
100 120 11 12 KA010000650
100 120 12 13 KA010100650
105 125 11 12 KA010400650
109 129 10 11 KA010900650
110 130 10 11 KA011000650
110 130 12 13 KA011200650
125 145 12 13 KA012500650
130 145 10 11 KA012800650
130 150 10 11 KA013200650
160 180 10 11 KA016100650
180 200 10 11 KA018100650
200 220 10 11 KA020000650
200 225 15 16 KA020100650
210 235 12.5 13.5 KA021100650
262 292 15 16 KA026200650

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