The Parker Prädifa piston sealing set profile ZS is a double-acting piston seal. It consists of the sealing rubber element, two anti-extrusion rings, and two angular guide rings.

Advantages of these sealing sets:

• Guiding and sealing are performed by the seal itself with very little space requirement.
• Suitable for use in mineral oils, HFA-, HFB, and HFC-fluids (max. + 60 °C).
• Easy installation without expensive auxiliaries
• Simple one-part piston design.

The application of the Parker Praedifa cylinder sealing sets is limited by the working conditions.  For severe working conditions, it is not recommended to make full use of the parameters stated in the table (next page). On the other hand, it may be possible to exceed these values for lower temperature applications.

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

Field of application:

Working pressure:

Temperature max. perm. pressure
Version “I’                 Version “I I”

60 °C                      315 bar                      250 bar

80 °C                      250 bar                       200 bar

100 °C                    160 bar                       160 bar

Working temperature:  —30 bis + 100 °C

HFA-, HFB- and HFC- fluids up to max. 60 °C

Surface speed:  ≤0,5 m/s

These parameters are valid providing that the manufacturing dimensions (including tolerances) in these cylinders are observed as close as possible during mechanical stress (eccentricity and bellying). Sealing set for double-acting pistons in presses, control cylinders. supporting and operating cylinders for industrial and mobile hydraulics.

Installation:

Sharp edges and burrs within the installation area of the seal must be removed. When mounting the seals, please regard the natural order of the individual elements: Start assembly with one of the angular guide rings. Care must be taken that the contact points (gaps) of the guide rings and the anti-extrusion rings are not directly in line. but that these are mounted in staggered order.

Compounds:

Rubber part NBA-compound with a Shore hardness of approx. 80A.

Anti-extrusion rings Polyester elastomer (W5035) Angular guide rings: Filled polyamide (W5016).