S-Type / Gas – Hydraulic Industrial Buffer

Heavy Duty Industrial Shock Absorber / COMPENSER®

With the S-Type, LEBEN provides a hydraulic industrial buffer (shock absorber) for applications in mostly heavy mechanical engineering industry (heavy duty).

Hydraulic Industrial Buffer

The preferred field of application for the (gas) hydraulic industrial buffer (COMPENSER®) of the S-series is in the medium to heavy engineering industry sector. As a heavy duty shock absorber it is used in large crane systems (e.g. harbour crane, shipyard crane or container crane), metallurgical plants, rolling mills, loading systems or as end stop integrated in a rail buffer stop. A wide range of additional equipment is available for this hydraulic industrial buffer. Maintenance and simple repairs can be carried out by the customer’s own personnel on site due to the modular design of this buffer.


  • installation position: any
  • high reset force
  • short design length
  • very high buckling safety
  • very robust guidance and bearing
  • low and high viscosity COMPENSOL®
  • surface: housing painted in RAL 1023 (standard), piston rod double hard chromium plated (standard)
  • flange is optionally mounted on front or rear, or foot mounting
  • optionally constant reaction force over the entire stroke or increasing reaction force in the beginning stroke range
  • very short activation time after impact
  • temperature range -40 to +80 ° C
  • energy absorption up to 3.450 kNm

The gas-filled inner tube 2 enters the outer tube 9. The damping medium flows from the pressure chamber 6 through the throttle orifices 8 of the metering tube 7 into the volume balance chamber 5. The separating piston 4 simultaneously moves in the direction of the impact cap 1 and compresses the nitrogen gas filling. In the gas space 3, the energy is stored which is required for the reset of the inner tube. When the inner tube 2 returns to the initial position, the separating piston 4 moves in the opposite direction and presses the damping medium back into the pressure chamber 6.

1 Impact cap 2 Inner tube 3 Gas space 4 Separating piston
5 Volume balance chamber 6 Pressure chamber 7 Metering tube 8 Throttle orifices
9 Outer tube 10 Rear flange    


Industrial Shock Absorber Buffer


  • Tube-in-tube construction
  • Installation tube for integrating the buffer into a concrete block (including: mounting plate and thread for fastening the flange, optionally: guide rod and traverse; corrosion protection: hot-dip galvanized).
  • Guide system with guide rod and cross bar / buffer beam
  • Anti-Climber protection according to DIN EN 12663-1
  • Auxiliary accumulator for reducing the resetting force, e.g. in operational load cycles
  • Sensor for signalling the operational readiness of the shock reducing element (inductive, magnetic, optical or as a mechanical limit switch – also available explosion-proof according to ATEX)
  • Integrated monitoring of filling levels
  • Pressure sensor (diaphragm or piston pressure switch) for monitoring the internal pressure
  • Sensor for position monitoring of the stroke
  • Integrated temperature monitoring
  • Integrated monitoring of filling levels
  • Maintenance connection for filling damping medium and nitrogen gas
  • Specific materials, e.g. stainless steel for a highly corrosive environment or use in the food industry
  • High-quality corrosion protection according to DIN EN ISO 12944 up to corrosion class C5M
  • Housing: painted (e.g. seawater resistant or zinc-free) or nickel-plated. / Piston rod: bronze hard chrome coating
  • Protective bellow as the best possible protection against dust, dirt or corrosive media
  • Leakage-free usage by highly viscous COMPENSOL®
  • Safe usage in automotive & food industry by appropriate COMPENSOL®
  • SpecialCOMPENSOL® for use in extreme temperature ranges
  • Valve to minimize the reset time
  • Drive energy absorption (throttling)
  • End position damping
  • Optional round or square flange on front or rear position
  • Foot mounting (welded or flanged)
  • Special mounting (e.g. eyes) according to the desired geometry of the customer
  • Special impact cap on customer request and for special applications (catching impact cap in case of two colliding impact caps)
  • Safety rope attached to the piston rod
  • Special seals for use in extreme temperature ranges
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