Buffer module S

Product Overview
The S-Type is a gas-hydraulic buffer (COMPENSER®) designed by LEBEN for medium to heavy mechanical engineering. Its modular tube‑in‑tube construction enables on-site maintenance and straightforward repairs by the operator's personnel. The unit is suitable as a stand-alone buffer or integrated end stop in large industrial systems.

Preferred area of application
Designed primarily for use in medium to heavy machinery, the S-Type is applied in large crane systems, metallurgical plants, rolling mills, loading systems, railway technology and as end stops in buffer stops.

Applications

• Crane systems: bridge cranes, gantry cranes and steel mill cranes
• Port and container cranes, ship-to-shore cranes and loading bridges
• Trolleys, crab trolleys, crane trolleys and crane end stops
• Conveyor systems and bulk material handling: stacker‑reclaimers, stackers, reclaimers, wagon tipplers and transfer cars
• Stacker cranes (ASRS), AS/RS systems, high‑bay warehouses and intralogistics
• Buffer stops, braking buffer stops, fixed buffer stops and track ends
• Railway couplings and intermediate buffers including automatic and Scharfenberg couplers
• Test benches, crash test installations, bespoke machine end stops

Technical Specifications

• Mounting position: any
• Reaction force: constant over stroke or increasing in front stroke range (option)
• Retracting force: high (option to reduce via additional accumulator)
• Energy conversion capacity: up to 3,450 kNm
• Temperature range: -40 to +80 °C
• Surface: housing painted RAL 1023 (standard); piston rod double hard chrome‑plated (standard)
• Damping medium: COMPENSOL® (low and high viscosity; special grades for extreme temperatures and food‑grade options)
• Flange or foot mounting; installation tube available for concrete embedding

Design & Function
The gas‑filled inner tube retracts into the outer tube. During impact, the damping medium flows from the working chamber through the metering tube throttle bores into the compensation chamber while the separating piston compresses the nitrogen gas. The gas stores the retraction energy and returns it during the rebound as the separating piston pushes the damping medium back into the working chamber.

Designations
1 impact cap
2 inner tube
3 gas chamber
4 separating piston
5 volume compensation chamber
6 working chamber
7 metering tube
8 throttle bores
9 outer tube
10 rear flange

Accessories

• Tube‑in‑tube construction
• Installation tube for concrete embedding (includes mounting plate and flange thread; optional guide rod and crosshead; hot‑dip galvanized)
• Guide system with guide rod and crosshead / transverse yoke
• Anti‑climber to DIN EN 12663‑1
• Additional accumulator to reduce retracting force for operational load cycles
• Operational readiness sensors (inductive, magnetic, optical or mechanical; ATEX options)
• Pressure sensor (diaphragm/piston pressure switch) and position sensors
• Integrated temperature and fill‑level monitoring
• Maintenance connection for filling damping medium and nitrogen
• Special materials (e.g. stainless steel) and corrosion protection up to DIN EN ISO 12944 C5M
• Housing finishes: painted, seawater‑resistant or nickel‑plated; piston rod coatings: double hard chrome or bronze‑hard chrome
• Bellows, safety wire rope, special seals, valves to minimize retraction time and various mounting options

Characteristics / Technical specifications

• Model / series: S‑Type (gas‑hydraulic buffer)
• Brand: LEBEN‑Dämpfungstechnik (COMPENSER® technology)
• Mounting position: any
• Reaction force: constant or increasing in front stroke (option)
• Retracting force: high; optional reduction via additional accumulator
• Energy conversion: up to 3,450 kNm
• Temperature range: -40 to +80 °C
• Surface treatment and corrosion protection options; piston rod coating options
• Damping medium: COMPENSOL® (various viscosities and special grades)
• Construction: tube‑in‑tube, robust guide and bearing, high buckling resistance
• Modular design for on‑site maintenance; maintenance connection for filling damping medium and nitrogen