Vald. Birns Maskinfabrik A/S is one of Europe's leading producers of transmission components and always stocks a complete range of V-belt pulleys.

VTP®-Pulley (Ventilated Turbo Pulley)

The latest addition is the internationally patented VTP®-Pu1ley, a V-belt pulley in a completely new design incorporating all aspects of optimized performance of V-belt pulleys. One of the improvements most worthy of mention is a combination of design and quality castings, which has resulted in a weight reduction of up to 50 % compared to conventional V-belt pulleys. Furthermore, due to the tilted spokes, the internal tensions of the V-belt pulley are reduced considerably.

Higher effects transmission

The V-belt pulleys will have a lower working temperature. Up to 17°C lower than with standard V-belt pulleys. This is of great importance for the lifetime of the V-belt pulley. ACC®-surface treatment is a new and more efficient surface treatment of castings, and naturally all of our VTP®-pulleys and the other V-belt pulleys are treated in this plant. Among other advantages the ACC®-process adds a high chemical resistance to oil, petrol, brake fluid, and lubricants, and exceptional physical properties of the cured film (6H-pencil hardness), and priming paint and finishing paint can be applied direct to the ACC®-surface. This is a very environmentally-friendly process, being free from any air pollutants.


Vald. Birn GmbH
Lahnstr. 34 - 3645478 Mülheim
Telefon: +49 208 999490
Telefax: +49 208 9994950

The iron quality GGG60 allows the circumferential speed to be increased up to 100 m/sec. and the resistance to wear of the V-belt pulley against the belt is improved.

Main advantages

  • Increases the life of the V-belts due to the venti lated grooves resulting in lower working temperatures (l0°C- l7°C).
  • Lower weight means less moments of inertia and requires smaller bearings. Also logistic costs are reduced.
  • Is made in nodular cast iron with a new design resulting in smaller tensions in the pulley.
  • VTP®-pulleys make it possible to use the V-belt transmissions at higher ambient temperatures.
  • Shock resistant, diminishing risk of damage during transport and mounting.
  • Allows more than a doubling of the belt speed (up to 100 m/s).
  • New surface treatment. ACC® - Autophoretic Coating Chemicals - ensures improved rust protection.

Documents to download

Transmission programme
Case Study from Australia
Flexible couplings
List of standart Pulleys
Vald Birn Salztest
Use of VTP pulleys in Screwcompressors