Flange seal Prädifa series NHI, FlexiSeal® | Product Series

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Inside Diameter (mm)

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Seal Material

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Flange seal Prädifa series NHI, FlexiSeal® Flange seal Prädifa series NHI, FlexiSeal®

Flange seal Prädifa series NHI, FlexiSeal®

Where to Buy

Flange seal. Internal pressure. Static and intermittently dynamic. FlexiSeal. Spring-energized PTFE seal. High-pressure.

Technical Specifications

  • Media: Hydraulic
  • Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®)
  • Maximum Operating Pressure: 1400 bar
  • Minimum Operating Temperature: -190 °C
  • Maximum Operating Temperature: 230 °C
  • Maximum Surface Speed: 0.005 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
  • Thermal Application Type: Expanded Low and High Temperature (< -35 to 140°C)
  • Pressure Rating: Extremely High Pressure (> 500 bar)
  • Operating Pressure: Internal Pressure
  • Outside Diameter: 12.5 to 800 mm
  • Inside Diameter: 5.9 to 768.4 mm
Safety Warning

Full Product Description

The NHI product series features a FlexiSeal® design with a helicoil spring and is ideally suited for flange sealing in extreme high-pressure applications. It seals the pressure gradient from inside to outside. The NHI series is characterized by extremely high temperature resistance and chemical resistance.

• Extended heel reduces the effects of extrusion.
• Helical spring for high load and small deflection range.
• Resilient helical spring resists permanent set and maintains compliance to long-term flange.
• Many high-resilience energizer options available, including choice of light, medium and heavy loads and NACE for oil field use.
• Low-cost elastomeric energizers available, all with excellent fatigue resistance.

Range of application:
Flange sealing in extreme high-pressure applications, pressure gradient from inside to outside.

Related Documents

Literature and Reference Materials
PTFE Seals Design Guide--PTD3354
FlexiSeal®--NHI internal high-pressure u2013 static, intermittently dynamic--PTD3354
Installation Guidelines for FlexiSeals®--PTD3354
Storage and Cleaning of Elastomer Seals--PTD3032
Product Demos & Tutorials
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
NHI-M001250-01-010-2 12.5 5.9 1.45 3.3 -190 230 Polytetrafluorethylene 10% carbon/graphite
NHI-M008300-03-001-1 83 70 3.1 6.5 -190 230 Polytetrafluorethylene virgin
NHI-M009400-03-005-1 94 81 3.1 6.5 -190 230 Polytetrafluorethylene 10% Ekonol
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