Parker Prädifa Piston Seals OE

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The Parker Prädifa double-acting OE piston sealing set featuring a Slipper Seal® design consists of a PTFE piston sealing ring and an elastomer O-ring as a preloading element. The seal design is intended for hydraulic applications. The symmetrical cross-section of the sealing ring is designed for uniform return of drag oil during the stroke in both directions. The OE sealing set is particularly well suited for double-acting pistons in control cylinders, servo-controlled systems, machine tools, and quick-acting cylinders.

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. For hydraulic applications, the piston sealing ring is preferably made from a bronze-filled PTFE compound in order to avoid reliable extrusion resistance. Alternatively, several compounds can be selected, depending on the specific application’s profile.

  • Good sealing performance in an extremely small assembly
  • It can also be used for single-acting applications.
  • 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
  • Assembly on the one-part piston is possible.
  • Insensitive to pressure
  • 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 7425-1.
  • Short axial assembly
  • Installation in closed and undercut
  • Available in diameters from 4 to 4500
  • Additional sizes of machined products available on short

Range of application

At high pressures.

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

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

Installation

This seal should only be used in combination with guiding elements (e.g. F3).

Size Ø D (mm) Groove Ø  d (mm) L (mm) Size Ø D (mm) Groove Ø  d (mm) L (mm)
80 8 3.10 2.20 600 60 49 4.20
100 10 5.10 2.20 630 63 52 4.20
120 12 7.10 2.20 630 63 47.50 6.30
150 15 7.50 3.20 630 63 48 7.50
160 16 11 2.20 650 65 54 4.20
160 16 8.50 3.20 700 70 59 4.20
180 18 10.50 3.20 800 80 69 4.20
200 20 15 2.20 800 80 64.50 6.30
200 20 12.50 3.20 850 85 69.50 6.30
220 22 14.50 3.20 900 90 74.50 6.30
250 25 17.50 3.20 950 95 79.50 6.30
250 25 14 4.20 1000 100 89 4.20
250 25 15 5 1000 100 84.50 6.30
280 28 20.50 3.20 1050 105 89.50 6.30
300 30 22.50 3.20 1100 110 94.50 6.30
320 32 24.50 3.20 1150 115 99.50 6.30
320 32 21 4.20 1200 120 104.50 6.30
320 32 22 5 1250 125 109.50 6.30
350 35 27.50 3.20 1250 125 104 8.10
400 40 32.50 3.20 1250 125 105 10
400 40 29 4.20 1300 130 114.50 6.30
400 40 30 5 1350 135 114 8.10
420 42 31 4.20 1400 140 119 8.10
450 45 34 4.20 1450 145 124 8.10
480 48 37 4.20 1500 150 129 8.10
500 50 39 4.20 1550 155 134 8.10
500 50 34.50 6.30 1600 160 144.50 6.30
500 50 35 7.50 1600 160 139 8.10
520 52 41 4.20 1600 160 135 12.50
550 55 44 4.20 1650 164 144 8.10

 

Size Ø D (mm) Groove Ø  d (mm) L (mm) Size Ø D (mm) Groove Ø  d (mm) L (mm)
1700 170 149 8.10 4000 400 375.50 8.10
1750 175 154 8.10 4000 400 370 12.50
1800 180 159 8.10 4000 400 360 20
1850 185 164 8.10 4100 410 385.50 8.10
1900 190 169 8.10 4200 420 395.50 8.10
1950 195 174 8.10 4300 430 405.50 8.10
2000 200 184.50 6.30 4400 440 415.50 8.10
2000 200 179 8.10 4500 450 425.50 8.10
2000 200 175 12.50 4600 460 435.50 8.10
2100 210 189 8.10 4700 470 445.50 8.10
2200 220 199 8.10 4800 480 455.50 8.10
2300 230 209 8.10 4900 490 465.50 8.10
2400 240 219 8.10 5000 500 475.50 8.10
2500 250 229 8.10 5000 500 470 12.50
2500 250 225.50 8.10 5200 520 495.50 8.10
2600 260 239 8.10 5500 550 525.50 8.10
2700 270 249 8.10 5700 570 545.50 8.10
2800 280 259 8.10 6000 600 575.50 8.10
2900 290 269 8.10 6200 620 595.50 8.10
3000 300 279 8.10 6400 640 615.50 8.10
3100 310 289 8.10 6500 650 622 9.50
3200 320 299 8.10 7000 700 672 9.50
3200 320 295.50 8.10 8000 800 772 9.50
3300 330 305.50 8.10 9000 900 872 9.50
3400 340 315.50 8.10
3500 350 325.50 8.10
3600 360 335.50 8.10
3700 370 345.50 8.10
3800 380 355.50 8.10
3900 390 365.50 8.10

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