Parker Prädifa Rod Sealing Set M2

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The Parker Prädifa rod sealing set profile M2 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. 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 Parker Praedifa 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 in case of contamination of the medium
    or slight damages of the sliding surfaces in comparison with one-part seals.
  • Excellent sealing performance due to long contact
    area and several sealing lips.
  • 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.

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

 

Field of application:

Working pressure:                  ≤ 350 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 (0502 Q5022).

Chevrons: Fabric reinforced rubber material, NBF-based (Q5018/05019)  resp.  NBR  elastomer (N3578).

Header ring: Polyacetal (POM-W5001) or hard fabric, NBR-based (Q5021/05022).

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 % 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 ring are cut at 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 
8 18 18,5 M2 0008 00005
10 20 18,5 M2 0010 00005
12 22 18,5 M2 0012 00005
14 24 18,5 M2 0014 00005
15 25 18,5 M2 0015 00005
16 26 18,5 M2 0016 00005
18 28 18,5 M2 0018 00005
20 30 18,5 M2 0020 00005
22 32 18,5 M2 0022 00005
24 34 18,5 M2 0024 00005
25 37 22,5 M2 0025 00005
28 40 22,5 M2 0028 00005
30 42 22,5 M2 0030 00005
32 44 22,5 M2 0032 00005
35 47 22,5 M2 0035 00005
36 48 22,5 M2 0036 00005
40 52 22,5 M2 0040 00005
42 54 22,5 M2 0042 00005
45 60 22,5 M2 0045 00005
48 63 22,5 M2 0048 00005
50 65 22,5 M2 0050 00005
55 70 22,5 M2 0055 00005
56 71 22,5 M2 0056 00005
60 75 22,5 M2 0060 00005
63 78 22,5 M2 0063 00005
65 80 22,5 M2 0065 00005
70 85 22,5 M2 0070 00005
75 90 22,5 M 20075 00005
80 95 22,5 M2 0080 00005
85 100 22,5 M2 0085 00005
90 105 22,5 M2 0090 00005
95 110 30 M2 0095 00005
100 115 30 M2 0100 00005
110 125 30 M2 0110 00005
115 130 30 M2 0115 00005
125 140 34 M2 0125 00005
130 145 34 M2 0130 00005
135 150 34 M2 0135 00005
140 155 34 M2 0140 00005
150 170 40 M2 0150 00005
160 180 40 M2 0160 00005
180 200 40 M2 0180 00005
190 210 40 M2 0190 00005
200 220 40 M2 0200 00005

Merk

Parker

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