The Parker Prädifa ZW  double-acting piston sealing set consists of an elastomer sealing component, two anti-extrusion, and two angular guide rings. By combining the sealing and guiding functions, it offers a cost-effective all-in-one solution for medium-duty standard cylinders.

• Good wear resistance.
• Assembly on the one-part piston is possible.
• Installation in closed and undercut.

Range of application

Sealing set for double-acting pistons in presses, drive cylinders, back-up, and operating cylinders for industrial and mobile hydraulics.

Operating pressure                                          ≤ 400 bar

Operating temperature                                  -35 °C to +100 °C

in HFA, HFB and HFC fluids                               +60 °C

Sliding speed                                                      ≤ 0.5 m/s

Compounds

Rubber component of the Parker Praedifa Piston Seals ZW: Highly wear-resistant NBR-compound NB078 with a hardness of 80 Shore A.

Anti-extrusion rings High-strength, wear-optimized polyester elastomer (W5035). Angular guide rings Thermoplast for high-pressure resistance even with increased temperatures (W5301).

Installation

Sharp edges and burrs in the assembly area of the seal must be removed. Assembly is performed in the following sequence: „rubber seal, anti-extrusion rings, angular guide rings“. Ensure that the contact points (gaps) of the angular guide and anti-extrusion rings are arranged in staggering positions.