The internally parker Prädifa sealing OR sealing set featuring a Slipper Seal® design consists of a PTFE rotor sealing ring and an elastomer O-ring as a pre-loading element.

It is particularly suitable for alternating sealing of rotary transmissions for slewing rings, swivel drives, hose reels, and in machine tool hydraulics. If the sealing set is used as an end seal, it is recommended to install a double wiper ring at the end of the components. Due to the special operating conditions of rotary transmissions, the OR rotor sealing sets are provided with one or two circumferential lubrication grooves.

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. Alternatively, several compounds can be selected, depend- ing on the specific application’s profile.

• Good sealing performance in extremely small assembly conditions.
• Excellent wear resistance.
• 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 friction.
• Insensitive to pressure peaks.
• High-temperature resistance assured by suitable O-ring compound selection.
• Improved lubrication due to pressure medium deposits in the dynamic contact area.
• High extrusion resistance.
• Adaptable to nearly all media thanks to the high chemical resistance of the sealing ring and large O-ring compound selection.
• Short axial assembly length.
• Installation in closed and undercut housings.
• Available in diameters from 4 to 4500 mm.
• Additional sizes of machined products available on short notice.

Range of application

Operating pressure                                          ≤ 300 bar

Operating temperature                                    -30 °C to +100 °C 1)

Sliding speed                                                    ≤ 1 m/s

Recommendation for rotary transmissions: P × v ≤ 25 (40)

(For definition see catalog „Hydraulic Seals“, chapter „Rotary Seals“, introduction.)

1) With deviation from the standard temperature range, please contact our consultancy service for the adequate O-ring compound.

Compounds

Parker Praedifa Sealing ring: Polon® 033, modified PTFE + 25 % carbon. O-ring: N0674, NBR elastomer with approx. 70 Shore A.

Installation

For diameters <30 mm open grooves are required.

This seal should only be used in combination with closed guiding elements.