Hydraulic Locking Unit (HLU) for passenger restraint systems

Maximum safety for passenger restraint systems in amusement rides

  • TÜV-Süd product certification according to the latest standards
  • Self-contained and low-maintenance hydraulic system
  • Infinitely variable positioning and silent bar adjustment

(*) Not all hydraulic locking systems have the TÜV-Süd product certification. It only affects the following classes (Report No.): 2 749 967 PTU G1; 2,749,967 PTU G2; 2,749,967 PTU G3; 2,749,967 PTU G4; 2,749,967 PTU G5. Please inquire at HOERBIGER whether your requested hydraulic locking system falls into one of these classes and has the associated advantages.

Unconditional fun thanks to maximum safety

Amusement park and fairground rides are popular among young and old alike. Roller coasters must become increasingly attractive to the public—and more often than not they challenge the physical limits of people and materials. Safety is absolutely essential—without compromises.

For decades, leading manufacturers of amusement rides have relied on HOERBIGER hydraulic locks and gained the confidence of numerous amusement park and ride operators.

The proven hydraulic components are implemented in a modular system, guaranteeing customized solutions and fast project engineering. The Hydraulic Locking Unit developed by HOERBIGER specifically for amusement rides and mobile structures forms the core of the system, ensuring maximum safety in over-the-shoulder restraints, lap bars and abdominal restraints. A special feature is that maximum safety standards have allowed the product to achieve a “PLr E-ready” performance level status.

Key benefits

TÜV certification

  • Tested standards: ISO 17842-01:2015, DIN EN 13814:2005, ASTM 2291-15
  • Fulfillment of prEN 13814:2016
  • TÜV Süd homologation: Significantly simplified acceptance process

Quality and Reliability

  • Maximum reliability: 35,000 operating hours or 7 years¹
  • Safety without compromises: Only one system, no attachments, low-maintenance, manual emergency operation
  • Highest quality standards: ISO 9001 certified plant, end-of-line and burn-in testings


  • Greater passenger comfort: silent bar adjustement and infinitely variable bar-adjustment
  • Ready-to-use: Simple installation—the system is filled with oil,tested and immediately ready to use.


  • Extensive services: Documentation, accessories and spare parts
  • Replacement systems:
    Because HOERBIGER offers brand new replacement systems, repairs are generally not available. The replacement of complete systems eliminates risks that arise from partial repairs
  • Short-notice exchange: If a substitute unit is needed, new exchange systems can be available in a matter of days, preventing a shutdown of the amusement ride.

¹ according to HOERBIGER‘s specification and associated anticipated stress of 5 million loads.

Adaptation options

We are able to modify a number of additional features for you as part of an application of the design:

  • Retraction forces and pressure configuration
  • Coil
  • Installation length
  • Cylinder stroke
  • Angle of joint head housing, base end

Feel free to contact us!

Technical Data

Type HLU Blocking direction Safety valve Installation length (with retracted piston rod)¹ Cylinder stroke¹ Fatigue load²
Series LE25 Retract and extend Yes 355 to 418 mm 80 to 140 mm 2.400 bis 10.500 N
Series LE32 Extend Yes (partly extra shut-off valve) 458 to 503,5 mm 110 to 150 mm 5.000 to 11.000 N

¹ Adaptations and applications are billed separately.

² Maximum cylinder load during normal operation according to ISO 17842-01:2015. Retention forces are additionally influenced by the pressure setting. The higher the forces of the secondary function, the lower the retention forces. Safety integrity for indicated value: PLr C.