Heavy Duty Rod Seal
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Heavy Duty Rod Seal

The heavy duty rod seal is a high-performance 2-piece combination seal consisting of a PTFE-filled slide ring and a profiled elastomer energizer. It is designed for large-diameter, high-pressure hydraulic cylinders where anti-twist stability and extrusion resistance are critical.

Technical Specifications

ParameterValueNotes
Pressure≤ 60 MPaDynamic peak pressure
Speed≤ 5 m/sReciprocating motion
Temperature-35°C to +100°C / +200°CBased on elastomer (NBR/FKM)
StandardsFits ISO 7425-2 groovesCompatible with Trelleborg Stepseal V

Material Selection

CodeCompoundCharacteristics
P502PPTFE + BronzeHigh compressive strength; standard for heavy-duty hydraulics.
P508PPTFE (Zinc-free)Optimized for zinc-free oils and non-lubricating fluids.
N / VNBR 80 / FKM 80Profiles available in Nitrile or Viton for chemical compatibility.

Key Engineering Benefits

  • Zero Stick-Slip: PTFE sliding surface prevents crawling at low speeds.
  • Anti-Twist Design: The profiled energizer prevents seal rotation during short-stroke oscillations (dithering).
  • High Extrusion Resistance: Supports radial clearance (S-max) up to 0.7mm depending on pressure and diameter.
  • High Contact Pressure: Specific cross-section geometry ensures zero-leakage at low and high pressures.

Critical Applications

  • Injection Molding Machines: High-frequency cycling.
  • Forging & Press Machines: Extreme pressure spikes.
  • Marine Hydraulics: Large-bore corrosion-resistant cylinders.
  • Metallurgical Equipment: Heavy load and high-temperature stability.

Critical Applications

  • Groove Dimensions: Machined to ISO 7425-2 or ISO 3320.
  • Surface Finish: Recommended $R_a \le 0.3 \mu m$ for the sliding rod.
  • Lead-in Chamfers: Essential to prevent PTFE ring damage during assembly.
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