Parker Prädifa Rotary Seals OR

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The internally parker Prädifa sealing OR sealing set featuring a Slipper Seal® design consists of a PTFE rotor sealing ring and an elastomer O-ring as a pre-loading element.

It is particularly suitable for alternating sealing of rotary transmissions for slewing rings, swivel drives, hose reels, and in machine tool hydraulics. If the sealing set is used as an end seal, it is recommended to install a double wiper ring at the end of the components. Due to the special operating conditions of rotary transmissions, the OR rotor sealing sets are provided with one or two circumferential lubrication grooves.

Due to the material combination of the slide ring (PTFE) and O-ring (elastomer), this product is suitable for a wide range of applications, especially for aggressive media and/or high temperatures. Alternatively, several compounds can be selected, depend- ing on the specific application’s profile.

  • Good sealing performance in extremely small assembly conditions.
  • Excellent wear resistance.
  • Minimal break-away and dynamic friction and no stick-slip tendency to ensure uniform motion even at low speeds.
  • Good energy efficiency due to low friction.
  • Insensitive to pressure peaks.
  • High-temperature resistance assured by suitable O-ring compound selection.
  • Improved lubrication due to pressure medium deposits in the dynamic contact area.
  • High extrusion resistance.
  • Adaptable to nearly all media thanks to the high chemical resistance of the sealing ring and large O-ring compound selection.
  • Short axial assembly length.
  • Installation in closed and undercut housings.
  • Available in diameters from 4 to 4500 mm.
  • Additional sizes of machined products available on short notice.

Range of application

Operating pressure                                          ≤ 300 bar

Operating temperature                                    -30 °C to +100 °C 1)

Sliding speed                                                    ≤ 1 m/s

Recommendation for rotary transmissions: P × v ≤ 25 (40)

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

1) With deviation from the standard temperature range, please contact our consultancy service for the adequate O-ring compound.

Compounds

Parker Praedifa Sealing ring: Polon® 033, modified PTFE + 25 % carbon. O-ring: N0674, NBR elastomer with approx. 70 Shore A.

Installation

For diameters <30 mm open grooves are required.

This seal should only be used in combination with closed guiding elements.

Size Ø d (mm) Groove Ø D (mm) L (mm) Size Ø d (mm) Groove Ø D (mm) L (mm)
40 4 8.90 2.20 630 63 74 6.30
60 6 10.90 2.20 650 65 76 6.30
80 8 12.90 3.20 700 70 81 6.30
100 10 14.90 3.20 750 75 86 6.30
120 12 16.90 3.20 800 80 91 6.30
140 14 18.90 3.20 850 85 96 6.30
160 16 20.90 3.20 900 90 101 6.30
170 17 21.90 3.20 950 95 106 6.30
180 18 22.90 3.20 1000 100 111 6.30
190 19 26.50 4.20 1100 110 121 6.30
200 20 27.50 4.20 1200 120 131 6.30
220 22 29.50 4.20 1300 130 141 6.30
240 24 31.50 4.20 1400 140 151 6.30
250 25 32.50 4.20 1500 150 161 6.30
270 27 34.50 4.20 1600 160 171 6.30
280 28 35.50 4.20 1700 170 181 6.30
300 30 37.50 4.20 1800 180 191 6.30
320 32 39.50 4.20 1900 190 201 6.30
330 33 40.50 4.20 2000 200 215.50 8.10
350 35 42.50 4.20 2100 210 225.50 8.10
360 36 43.50 4.20 2200 220 235.50 8.10
370 37 44.50 4.20 2300 230 245.50 8.10
380 38 49 6.30 2400 240 255.50 8.10
400 40 51 6.30 2500 250 265.50 8.10
420 42 53 6.30 2560 256 277 8.10
450 45 56 6.30 2600 260 281 8.10
480 48 59 6.30 2700 270 291 8.10
500 50 61 6.30 2800 280 301 8.10
550 55 66 6.30 2900 290 311 8.10
600 60 71 6.30 3000 300 321 8.10
Size Ø d (mm) Groove Ø D (mm) L (mm)
3100 310 331 8.10
3200 320 241 8.10
3300 330 351 8.10
3400 340 361 8.10
3500 350 371 8.10
3600 360 281 8.10
3700 370 391 8.10
3800 380 401 8.10
3900 390 411 8.10
4000 400 421 8.10
4200 420 431 8.10
4500 450 471 8.10
4700 470 491 8.10
5000 500 521 8.10
5300 530 551 8.10
5500 550 571 8.10
5800 580 601 8.10
6000 600 621 8.10
6200 620 641 8.10
6400 640 661 8.10
6500 650 678 9.50
8000 800 828 9.50

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