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Fluid coupling type TV..F

The fluid coupling type TV..F is a constant-filled coupling used in drives for armored face conveyors, transfer conveyors and crushers. Centrifugal valves control the filling and draining of the working circuit of the coupling and thus the power transmission. The motor starts up almost load-free, even in the event of voltage drops. The coupling torque is relieved shock-free and continuously until the required breakaway torque of the system is built up. This allows overloaded driven machines to be started up.

The driven machine starts up extremely gently and the increase in torque is dependent upon the load. The coupling also protects the drive against overload and dampens torsional vibration. This protects your system and increases its productivity.

We offer fluid couplings with operating medium as water (type TWV..F) especially for potentially explosive atmospheres or with outer casing made from spheroidal cast iron (type TUV..F) for use in operations with respective material requirements.


Voith GmbH & Co. KGaA
Hydrodynamic Couplings
Voithstr. 1
74564 Crailsheim, Germany

Sales, Technical Consulting, Quotations
Tel. +49 7951 32-409
Fax +49 7951 32-213

Service, Spare parts, Repair
Tel. +49 7951 32-1020
Fax +49 7951 32-554

24/7 Technical Emergency Helpline
+49 7951 32-1616

Benefits and uses

  • Load-free motor run-up
  • Smooth start-up of driven machine
  • Protects the drive in case of an overload
  • Dampens torsional vibration in the drive
  • Automatic reaction to voltage drops and motor protection
  • Protects system components - the service life of your system increases
  • Robust and unsusceptible to environmental influences
  • Wear-free power transmission - reduces maintenance and repairs
  • Automatic load sharing in multi-motor drives protects your motor against overload
  • Sequential startup of the motors reduces the load on the supply circuit

Typical fields of use

  • Armored-face conveyors
  • Stage Loader
  • Crushers


The installation dimensions and performance characteristics correspond with the couplings.

Technical information

Operating principle

         <br />
        Operating principle of the hydrodynamic power transmission
Operating principle of the hydrodynamic power transmission

Hydrodynamic couplings transmit mech­anical power from the motor to the driven machine via a flow of fluid. This occurs by means of two bladed wheels positioned face to face. The primary wheel (red) is connected with the motor and acts like a rotary pump, the sec­ond­ary wheel (blue) is connected to the driven machine and acts like a turbine. Power transmission is pro­por­tional to the fill level in the working circuit. As a result of the mechanical separation of the drive and driven sides, the hydro­dynamic couplings transfer the power wear-free and dampen the torsional vibration and torque shocks in the drive chain at the same time.

Hydrodynamic circulation / Constant-filled couplings

        Hydrodynamic circulation
Hydrodynamic circulation

Constant-filled couplings are self-contained drive components. The different types of constant-filled couplings are mainly differentiated by the volumetric chambers , where their automatically controlled fill and emptying have a decisive influence upon start-up behavior. The demand of the drive application determines the coupling type and capacity. Constant-filled couplings are mainly used for soft start, torque limitation and dampening the torsional vibration behavior of the drive.

Valve control function

Voltage drops in the supply circuit may occur frequently underground. If the motor becomes overloaded and the speed drops to a certain switching speed (nV2), the centrifugal valves and operating fluid flow out of the working circuit back into the delay chamber. This reduces the torque transmission rating, the motor is relieved and re-accelerates to full speed. Once the valve switching speed (nV1) has been reached again, the centrifugal valves close and the operating fluid flows back in the working circuit and the torque transferred increases. This procedure is repeated until the supply circuit has re-stabilized.


Voith doesn't just supply couplings, we are also your engineering partner for customer-specific drive solutions:

  • Designing of complete drives
  • Dimensioning the coupling for the optimal use of your system
  • Analysis and optimization of the operating state of drives in existing systems (retrofit)
  • We can advise you about the selection of optimal start-up technologies
  • Competence in systems for all mining equipment and the bulk material industry

Filling of a Turbo Coupling