Stopping, turning, locking (STL) systems

Dellner Brakes’ innovative stopping, turning, locking (STL) systems comprise one or more disc brakesturning devices and locking modules. These systems are precision engineered and fully modular, so you can choose from the three functions to create a system that fits your application:

  • Individual stopping, turning or locking functions
  • Dual functions stopping and turning, stopping and locking, or turning and locking
  • A complete stopping, turning and locking system

Whichever combination you choose, the stopping, turning and locking functions are all operated through a single control panel or from an optional remote hand held control. They can even be operated wirelessly through a smartphone or Ipad.

Our STL systems are available with hydraulic or electric power. They come in three standard sizes and can also be scaled up for large marine vessels or industrial machinery, and adapted to meet your specific needs.


    How does STL work?


       STL case stories

    UK Royal Navy Queen Elizabeth Class aircraft carriers


    UK Royal Navy Type T45 Destroyers


    LKAB iron ore kiln

    Why STL?

    Dellner Brakes’ STL systems give you complete control over your stopping, turning and locking functions for marine and industrial applications.  

    Marine propulsion

    In marine vessels, the STL system fits round the propeller shaft to enable faster directional changes with maximum manoeuvrability. It also helps lower fuel consumption, reduces load on propulsion systems and makes routine maintenance quicker, easier and safer, including hydrodynamic bearing conditioning on large vessels.

    Securing the propeller prevents damage to the shaft and bearings if the vessel is drifting or buffeted by waves. It also allows ROVs and divers to operate around the propeller blades in safety. When in harbour, using the turning function to rotate the propeller can also help to reduce marine growth on the blades and lubricated shaft bearings.

    • Icebreakers: STL quickly stops the shaft if the vessel sails into thick or hard ice, then can turn the propeller to free it from the ice and prevent ice jams.
    • Trawlers: The secured propeller prevents damage to fishing nets.
    • Military vessels: STL can be laboratory tested and built with flex in the mountings to provide shock protection and avoid damage to the system in the event of impact.
    • Luxury yachts: STL reduces drag by optimising blade positioning.

    Industrial machinery

    The STL system allows large rotating machinery like mining equipment, iron ore pellet drums and car shredders to be cranked into operation, stopped and mechanically locked for safe maintenance.

    Download leaflets

    STL for materials handling leaflet


    STL for marine propulsion leaflet

    BUEL STL

    Our compact, self contained BUEL STL systems combine elements from Dellner Brakes’ innovative stopping, turning and locking (STL) systems with Pintsch Bubenzer’s patented BUEL electrohydraulic thruster / power package. Needing no external piping, the systems are compact, easy to install and, with the BUEL using only half a litre of high performance synthetic oil (compared to seven litres of hydraulic oil in standard hydraulic power units), are cheaper to run and environmentally-friendly too.

    At its simplest, the new system combines a Pintsch Bubenzer BUEL Model G, delivering up to 240 bar of pressure, with a powerful Dellner disc brake offering stopping torque of up to 1,026 kN. Customers can then choose to add a Dellner locking device that, available with hydraulic, electric or manual power, can deliver locking force of up to 1,000 kN. Customers requiring a full STL system can then also add a Dellner electrical continuous turning device , which uses an electric gear wheel to move the brake disc and attached shaft to any position – forwards and backwards ­– or turn the disc continuously, all with variable speed and torque of up to 119 kN.

    View press release

    Electrical STL – a world first

    Our fully automated, electrical STL (eSTL) braking system is a world first. It’s been developed in response to an increasing global focus on environmental issues, along with a demand for smaller, flexible braking solutions.

    The patent pending eSTL system is powerful and compact, and needs no additional piping making it quicker, easier and less costly to install – especially where space is at a premium.

    It’s simple to use, hard wearing and easy to maintain and is perfect for applications where a clean environment is paramount, or for use in green shipping lanes.

    Download datasheet

    View press release



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