Heavy-Duty, Four-Piece Piston Seal

Series 235: Heavy-Duty, Four-Piece Piston Seal

The 235 Series is designed for compact piston applications where space is restricted. It consists of a profiled energizer, a polyurethane seal element and two L-shaped anti-extrusion rings that also function as bushings. It is designed for double-acting cylinders in heavy-duty applications subject to severe pressure spikes coupled with high running clearance.



Long service life under the harshest conditions

Compatible with water-based fluids (H-PU)

Designed for space-restricted applications

Easy installation


The 235 Series, four-piece piston seal is ideal in heavy duty sealing applications where space is restricted and pressure spiking can occur.

Typical Applications

  • Mining
  • Heavy-duty clamp cylinders
  • Specialty high-pressure cylinders
  • Hydraulic rams
  • Various advancing and secondary cylinders

The 235 Series piston seal features a robust NBR elastomer, a profile seal cap in abrasion resistant polyurethane and two L-shaped backup rings in high-strength thermoplastic.

Material Code
Polyurethane H-PU / NBR / POM MP38
Temperature MP03

hydraulic oil -20…+115 -5…+240
water oil emulsions (HFA) +5…+55 +40…+130
water-glycol fluids (HFC) -20…+55 -5….+130
polyol esters (HFD) - -
water +5…+55 +40…+130
Speed 0.5 m/s (1.6 ft/sec)
Pressure 690 bar (10000 psi)

Note:for other materials or fluids please contact our engineering department.