Heavy-Duty, Four-Piece Piston Seal

Series 234: Heavy-Duty, Four-Piece Piston Seal

The 234 Series is one of the most robust four-piece piston seals available on the market. It consists of a profiled energizer, a polyurethane seal element and two active anti-extrusion backup rings. 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)

Optimized for high running clearance

Easy Installation


The 234 Series, four-piece piston seal is ideal in heavy duty sealing applications where pressure spiking can occur.

Typical Applications

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

The 234 Series piston seal features a robust NBR elastomer, a profile seal cap in abrasion resistant polyurethane and two backup rings in high-strength thermoplastic.

Material Code
Polyurethane H-PU / NBR / POM MP38

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 1380 bar (20000 psi)

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