Parker Prädifa Rod Seals OD

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The single-acting Parker Prädifa OD rod sealing set featuring a Slipper Seal® design consists of a PTFE rod seal and an elastomer O-ring as a preloading element. The asymmetric cross-section of the seal has been designed for optimum return of drag oil during the stroke in both directions. The optimum sealing effect is achieved by installation in a tandem arrangement in combination with a double wiper ring.

The Parker Praedifa OD product series is particularly well suited for piston rods in control cylinders, servo-assisted systems, machine tools, and quick-acting cylinders. The sealing set is successfully used in the automotive industry (e.g. in shock absorbers) and the process industry as well. Due to the material combination of the slide ring (PTFE) and the O-ring (elastomer), this product is suitable for a wide range of applications, especially for aggressive media and/or high temperatures. Several alternative compounds may be selected depending on the specific application profile.

  • Good sealing performance in an extremely small assembly condition
  • 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.
  • High-temperature resistance assured by suitable O-ring compound
  • High extrusion resistance.
  • Adaptable to nearly all media thanks to the high chemical resistance of the sealing ring and large O-ring compound selection.
  • Dimensions according to ISO 7425-2.
  • Also available as double-acting
  • Short axial assembly
  • Installation in closed and undercut
  • Available in diameters from 4 to 4500
  • Additional sizes of machined products available on short
  • Insensitive to pressure peaks

Range of application

Rod sealing set for hydraulic cylinders.

Operating pressure                                          ≤ 400 bar

in case of reduced extrusion gap                ≤ 600 bar

(H7/ f7) and large cross-sections.

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

Sliding speed                                                    ≤ 4 m/s

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

Compounds

Sealing ring: Polon® 052, modified PTFE + 40 % bronze. O-ring: N0674, NBR elastomer with approx. 70 Shore A.

Installation

For diameters ≤30 mm open grooves are required.

Size Ø d (mm) Groove Ø D (mm) L (mm) Size Ø d (mm) Groove Ø D (mm) L (mm)
40 4 8.90 2.20 320 32 42.70 4.20
50 5 9.90 2.20 320 32 43 4.20
60 6 11 2.20 350 35 45.70 4.20
70 7 11.90 2.20 360 36 47 4.20
80 8 13 2.20 380 38 53.10 6.30
80 8 15.30 3.20 400 40 51 4.20
100 10 15 2.20 400 40 55.10 6.30
100 10 17.30 3.20 420 42 57.10 6.30
120 12 17 2.20 450 45 56 4.20
120 12 19.30 3.20 450 45 60.10 6.30
120 12 19.50 3.20 480 48 63.10 6.30
140 14 19 2.20 500 50 61 4.20
140 14 21.50 3.20 500 50 65.10 6.30
150 15 22.30 3.20 520 52 67.10 6.30
160 16 23.50 3.20 550 55 70.10 6.30
180 18 25.30 3.20 560 56 67 4.20
180 18 25.50 3.20 560 56 71.50 6.30
200 20 27.50 3.20 580 58 73.10 6.30
200 20 30.70 4.20 600 60 75.10 6.30
200 20 31 4.20 630 63 74 4.20
220 22 29.50 3.20 630 63 78.50 6.30
220 22 32.70 4.20 650 65 80.10 6.30
220 22 33 4.20 700 70 85.10 6.30
250 25 32.50 3.20 700 70 85.50 6.30
250 25 35.70 4.20 750 75 90.10 6.30
250 25 36 4.20 800 80 95.10 6.30
260 26 36.70 4.20 800 80 95.50 6.30
280 28 38.70 4.20 850 85 100.10 6.30
280 28 39 4.20 900 90 105.10 6.30
300 30 40.70 4.20 900 90 105.50 6.30

 

Size Ø d (mm) Groove Ø D (mm) L (mm) Size Ø d (mm) Groove Ø D (mm) L (mm)
950 95 110.10 6.30 2500 250 270.50 8.10
1000 100 115.10 6.30 2500 250 271 8.10
1000 100 115.50 6.30 2600 260 284 8.10
1100 110 125.10 6.30 2700 270 294 8.10
1100 110 125.50 6.30 2800 280 304 8.10
1200 120 135.10 6.30 2800 280 304.50 8.10
1250 125 140.10 6.30 2900 290 314 8.10
1250 125 140.50 6.30 3000 300 324 8.10
1300 130 145.10 6.30 3100 310 334 8.10
1400 140 155.10 6.30 3200 320 344 8.10
1400 140 155.50 6.30 3200 320 344.50 8.10
1500 150 165.10 6.30 3300 330 354 8.10
1600 160 175.10 6.30 3400 340 364 8.10
1600 160 175.50 6.30 3500 350 374 8.10
1600 160 181 8.10 3600 360 384 8.10
1700 170 185.10 6.30 3600 360 384.50 8.10
1750 175 190.10 6.30 3700 370 394 8.10
1800 180 195.10 6.30 3800 380 404 8.10
1800 180 195.50 6.30 3900 390 414 8.10
1800 180 201 8.10 4000 400 424 8.10
1850 185 200.10 6.30 4100 410 434 8.10
1900 190 205.10 6.30 4200 420 444 8.10
1950 195 210.10 6.30 4300 430 454 8.10
2000 200 220.50 8.10 4400 440 464 8.10
2000 200 221 8.10 4500 450 474 8.10
2100 210 230.50 8.10 4600 460 484 8.10
2200 220 240.50 8.10 4700 470 494 8.10
2200 220 241 8.10 4800 480 504 8.10
2300 230 250.50 8.10 4900 490 514 8.10
2400 240 260.50 8.10 5000 500 524 8.10

 

Size Ø d (mm) Groove Ø D (mm) L (mm)
5200 520 544 8.10
5500 550 574 8.10
5700 570 594 8.10
6000 600 624 8.10
6200 620 644 8.10
6400 640 664 8.10
6500 650 677.30 9.50
7000 700 727.30 9.50
8000 800 827.30 9.50
9000 900 927.30 9.50

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