Piston sealing set Prädifa series ZP | Product Series

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Inside Diameter (mm)

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Seal Material

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Piston sealing set Prädifa series ZP Piston sealing set Prädifa series ZP Piston sealing set Prädifa series ZP

Piston sealing set Prädifa series ZP

Where to Buy

Piston sealing set for hydraulic cylinders, double-acting. Three-piece design.
For high pressures and extreme pressure peaks. Robust design with extreme wear resistance.

Technical Specifications

  • Maximum Operating Temperature: 100 °C
  • Inside Diameter: 95 to 275 mm
  • Outside Diameter: 110 to 300 mm
  • Media: Hydraulic
  • Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR)
  • Maximum Operating Pressure: 500 bar
  • Minimum Operating Temperature: -20 °C
  • Maximum Surface Speed: 0.1 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
  • Thermal Application Type: Standard Moderate Temperature (-35 to 100°C)
  • Pressure Rating: Extremely High Pressure (> 500 bar)

Full Product Description

The double-acting piston sealing set ZP consists of a rubber-fabric seal with back-up rings on both sides to prevent extrusion. The dynamic surface of the seal on the outer diameter is reinforced with a special dimensionally stable fabric. This supports the development of a lubricating film between the seal and the cylinder wall, even after long standstill periods and under high pressure. This grease deposit reduces breakaway friction and dynamic friction and thus wear of the dynamic surface of the seal. The surface structure ensures wear resistance, even in low-lube conditions. The ZP sealing set is extremely robust, even in harshest conditions such as particle contamination in the system.

• Exceptionally high static and dynamic sealing performance.
• Enhanced sealing performance in non-pressurized conditions.
• Can also be used for single-acting applications.
• Robust seal profile for harshest operating conditions.
• Insensitive to contamination of the operating medium or slight damage of the sliding surfaces compared with single-part seals.
• Good wear resistance.
• Long service life thanks to application-optimized compounds.
• Constantly low dynamic friction throughout the part's service life.
• Insensitive to extreme pressure peaks.
• Improved lubrication due to pressure medium deposit in the dynamic contact area.
• Extremely high extrusion resistance.
• Simple fabrication of the housing.
• Installation in open housings.

Range of application:
Mainly used for double-acting pistons in cylinders for hydraulic roof supports and for tunneling machines.

Related Documents

Literature and Reference Materials
Installation Guidelines for Piston Seals--PTD3350
Storage and Cleaning of Elastomer Seals--PTD3032
Product Demos & Tutorials
How to Properly Store and Clean Elastomer Seals
Mixing the right ingredients: Material Development at Parker-Prädifa
Parker Final Exam in Physics / Sealing Systems Put to the Test
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Products Outside Diameter (mm) Inside Diameter (mm) Element Height (mm) Groove Width Minimum Working Temperature (C) Maximum Working Temperature (C) Seal Material
ZP010900250 110 95 16 16 -20 100 Z5017
ZP012000250 120 105 16 16 -20 100 Z5017
ZP012500250 125 110 15.8 15.8 -20 100 Z5017
ZP013100250 130 115 16 16 -20 100 Z5017
ZP014000250 140 125 16 16 -20 100 Z5017
ZP014900250 150 133 20 20 -20 100 Z5017
ZP015000250 150 135 16 16 -20 100 Z5017
ZP016000250 160 145 16 16 -20 100 Z5017
ZP016500250 165 150 16 16 -20 100 Z5017
ZP018000250 180 160 18 18 -20 100 Z5017
ZP018100250 180 163 20 20 -20 100 Z5017
ZP019000250 190 170 16 16 -20 100 Z5017
ZP020000250 200 180 16 16 -20 100 Z5017
ZP021000250 210 190 16 16 -20 100 Z5017
ZP021900250 220 195 22 22 -20 100 Z5017
ZP022100250 220 200 20 20 -20 100 Z5017
ZP023000250 230 210 16 16 -20 100 Z5017
ZP026000250 260 235 25 25 -20 100 Z5017
ZP027000250 270 245 24 24.000 -20 100 Z5017
ZP028000250 280 255 25 25 -20 100 Z5017
ZP030000250 300 275 25 25 -20 100 Z5017
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