Parker Prädifa Rod Sealing Set M3

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The Parker Prädifa rod sealing set profile M3 consists of 5 chevron rings (3 fabric-reinforced and 2 rubber seals), 1 header ring, and 1 back-up ring. The header ring may be manufactured of hard fabric material or of plastic. The back-up ring is only manufactured in hard fabric. For rod diameters of 80 mm and larger we supply these sets with 4 fabric reinforced chevrons and 1 rubber seal. For diameters of 14C mm and larger the sets contain 5 fabric reinforced chevrons. In case of dimensions different from those mentioned in this leaflet please choose a packing set combination from our MO-programme. Our sales department will inform you of the respective order code.

The main advantages of these rod sealing sets are:

  • Adjustability to different fluids and temperature ranges by proper choice of suitable compounds
  • Adaptability to exceptional working conditions by changing or adjusting the axial preload (shims or screw rings).
  • Not sensitive to high-pressure peaks on account of form stability.
  • Not sensitive to contamination of the medium, or slight damages to the sliding surfaces in comparison with one-piece seals.
  • It is possible to split the seals to facilitate the installation. Thus it is not necessary to fully dismantle the cylinder in the case of maintenance or repair.
  • Excellent sealing performance due to long contact area and several sealing lips.

 

The Parker Praedifa chevrons are manufactured with radial preload, which provides close contact of the sealing lips at the inside and outside diameters achieving a good sealing performance with low friction. The operating pressure is effective in providing a close fit between the sealing set and the mating surfaces. An optimum adaption of the relative friction to tightness may be achieved by an adjustable housing (screw rings or shims). Due to this adjustment facility, it is possible to achieve a longer working seal life.

Field of application:

Working pressure:                   ≤ 500 bar

Working temperature:           —40 to +100 °C

Surface speed:                          ≤ 0,5 m/s

Chevron sealing sets are well suited for the sealing of plungers, piston rods of presses, cylinders, valve shafts, and spools, even in difficult working conditions. Thus they can be recommended for use where the actual conditions are difficult to predict.

Compounds:

Back-up ring:  Hard fabric, NBR-based (Q5021/ Q5022).

Chevrons: Fabric reinforced rubber material, NBR-based (05018/Q5019) resp. NBR elastomer
(N3578).

Header ring: Polyacetal (POM-W5001) or hard fabric, NBR-based (Q5021/Q5022).

For special requirements (pressure, temperature, speed, etc.) please contact our Consultancy Service, so that suitable materials and/or designs can be recommended.

Installation:

Due to the relatively low elasticity of the fabric chevrons and the required axial preload of these sealing sets, an installation groove, which is open on one side has to the provided. The actual height of the set is normally in accordance with the length
“L” of the housing. Manufacturing tolerances of the seals and the metal parts (especially in case of large dimensions) may be compensated for by screwrings or shims in order to achieve an optimum function. (Adjustability at least 5 `)/0 of the length “L”).

When strongly squeezed the flexibility of the sealing set may be substantially reduced. Thus it could be transformed to act as rod guidance with excessive friction and high wear. Due to the adjustability, it is possible to use these sets for special applications: For example in case of high speed, exceptionally large temperature range, strongly varying pressure, or a combination of these parameters. The various components of the set must be installed individually according to their sequence within the set. Oiling or slightly greasing will facilitate the assembly. Fabric chevrons with relatively large cross-sections can be made more flexible by slightly kneading them in warm oil. This will facilitate the installation considerably. For easier maintenance, the sealing sets may also be slit. The chevrons and the back-up the ring are cut at a 45° angle, the header ring with a 90° angle. The cuts of the components must be staggered by 120° at installation, which will not alter the length of the housing.

d D H/L Item number 
10 22 22,5 M3 0010 00005
16 28 22,5 M3 0016 00005
20 32 22,5 M3 0020 00005
22 34 22,5 M3 0022 00005
25 40 22,5 M3 0025 00005
28 43 22,5 M3 0028 00005
30 45 22,5 M3 0030 00005
32 47 22,5 M3 0032 00005
35 50 22,5 M3 0035 00005
36 51 22,5 M3 0036 00005
40 55 22,5 M3 0040 00005
42 57 27,5 M3 0042 00005
45 65 27,5 M3 0045 00005
50 70 30 M3 0050 00005
55 75 30 M3 0055 00005
56 76 37 M3 0056 00005
60 80 37 M3 0060 00005
63 83 37 M3 0063 00005
65 85 40 M3 0065 00005
70 90 40 M3 0070 00005
75 95 40 M3 0075 00005
80 100 40 M3 0080 00012
85 105 40 M3 0085 00012
90 110 40 M3 0090 00012
95 115 40 M3 0095 00012
100 120 40 M3 0100 00012
110 130 40 M3 0110 00012
115 140 46 M3 0115 00012
120 145 46 M3 0120 00012
125 150 46 M3 0125 00012
140 165 46 M3 0140 00021
150 180 60 M3 0150 00021
160 190 60 M3 0160 00021
180 210 60 M3 0180 00021
190 220 60 M3 0190 00021
200 230 60 M3 0200 00021
220 250 60 M3 0220 00021
320 360 78 M3 0320 00021

Merk

Parker

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