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.

STL for materials handling leaflet

STL for marine propulsion leaflet

How does STL work?

The hydraulic or electric spring released disc brake stops the brake disc quickly in any position. More>

Indexed turning (hydraulic)
Indexed turning’ (iT) uses controlled hydraulic cylinders to turn the brake disc forward to a precise, indexed position. More>

Continuous turning (electrical)
Continuous turning’ (cT) 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. More>

When the brake disc is in position, the locking device inserts a specially designed tapered pin (or ‘pawl’) into a machined slot on the brake disc to lock the disc securely in place. More>

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.

   STL case stories

UK Royal Navy Queen Elizabeth Class aircraft carriers

UK Royal Navy Type T45 Destroyers

LKAB iron ore kiln

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

Member of Dellner Industrial