Parker Prädifa Piston Sealing

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The Parker Prädifa piston sealing set profile M4 seals the piston against the cylinder. This sealing set consists of a chevron with a header and a back-up ring. By the proper choice of compound for the chevron seal, this sealing set may be adjusted for a large variety of working conditions. For example, The chevron seal could be supplied
with NBR material without fabric reinforcement, thus allowing use at low temperatures or in case of exceptionally severe sealing situations.

Installation:

For the installation of these Parker Praedifa seals, a two-piece piston is essential. Care should be taken that the sealing set is not drawn over sharp edges or threads during installation. The piston should be designed so that the sealing set can be installed with the header ring rear surface first so that a slight inlet slope or a radius at the centerpiece of the piston will be sufficient to facilitate the installation. The values for »e«  are maximum values with completely worn out wear rings (see chapter A “Gap sizes”).

Field of application:

Working pressure:                 ≤ 500 bar

Working temperature:         -40 to + 100 °C

Surface speed:                        ≤ 0,5 m/s

Preferably to be used for double-acting pistons for sealing cylinders.

Compounds:

Back-up ring: NBR-based hard fabric compound  (05021/Q5022).

Chevron ring: NBR-based compound with fabric reinforcement (05018/05019).

Header ring:   Polyacetal (POM-W5001) or NBR-based hard fabric (05021/05022).

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

 

D d H L Item number 
20 10 9 9,3 M4 0020 00001
22 12 9 9,3 M4 0022 00001
25 15 9 9,3 M4 0025 00001
28 18 9 9,3 M4 0028 00001
30 20 9 9,3 M4 0030 00001
32 20 10,5 10,9 M4 0032 00001
35 23 10,5 10,9 M4 0035 00001
36 24 10,5 10,9 M4 0036 00001
40 25 11 11,5 M4 0040 00001
42 27 11 11,5 M4 0042 00001
45 30 11 11,5 M4 0045 00001
50 35 11 11,5 M4 0050 00001
55 40 11 11,5 M4 0055 00001
56 41 11 11,5 M4 0056 00001
60 45 11 11,5 M4 0060 00001
63 48 12,5 13 M4 0053 00001
70 50 14,5 15,2 M4 0070 00001
80 60 14,5 15,2 M4 0080 00001
90 70 20,5 21,2 M4 0090 00001
100 80 20,3 21,2 M4 0100 00001
110 90 20,5 21,2 M4 0110 00001
115 95 20,5 21,2 M4 0115 00001
125 100 25,1 25,8 M4 0125 00001
140 115 25,1 25,8 M4 0140 00001
150 120 28 29 M4 0150 00001
160 130 28 29 M4 0160 00001
180 150 30,5 31,5 M4 0180 00001
200 170 32,5 33,5 M4 0200 00001
225 195 32,5 33,5 M4 0225 00001
250 220 32,5 33,5 M4 0250 00001
275 245 32,5 33,5 M4 0275 00001
300 270 32,5 33,5 M4 0300 00001

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Parker

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