Variable Speed Turbo Couplings
SVTW Variable Speed Turbo Coupling
Water as operating medium opens up new application
4 6 5
1 Motor shaft
2 Coupling housing
3 Primary wheel
4 Secondary wheel
5 Coupling shell
6 Adjustable scoop tube
7 Output shaft
8 Water inlet
9 Water outlet
10 Scoop tube linkage
Agricultural irrigation system equipped with
Voith variable speed turbo couplings.
Sectional view of water operated variable speed
turbo couling type SVTW.
Voith variable speed turbo couplings can
now also be operated with water. This
opens up many new fields of application.
These new couplings combine a new
concept with proven technology. The
SVTW variable speed turbo coupling has
been developed for the speed control of
pumps in irrigation systems. As a result
of automatically adapting the pump speed
it keeps the water pressure in the irrigation
system constant. Other fields of
application are municipal water supply
systems, waste water and sewage water
systems. Further applications are water
supply systems for power plants, steel
plants and chemical plants.
The application of SVTW variable speed turbo
couplings results in significant benefits:
n Easy and robust speed control
n Water is used to transmit power
n Generated heat is dissipated via
the operating medium water
n Environment-friendly by using water
as operating fluid
n No cooling system needed
n A model of ecology
n High efficiency of the entire plant by
speed control of the driven machine
n Compact design, low space requirement
n Easy and low maintenance
n Load-free start-up
n Jolts and vibrations are absorbed
n Highest availability.
Design and function
Voith variable speed turbo couplings are hydrodynamic
couplings. They transmit energy by
the dynamic forces of a circulating fluid. By varying
the position of a scoop tube reaching into
the working chamber, the quantity of fluid in the
coupling can be changed.
Thus the speed of the driven machine can be
varied steplessly during operation. Compactly
designed and easily installed, the coupling can
be flanged to the main motor. The result is a
compact drive unit.
District heating water pump drive with variable
speed turbo coupling type 562 SVTW, Germany
(P = 250 kW, n = 1485 rpm).
Electric motor (P = 600 kW,
n = 990 rpm) with vertical
water coupling 866 SVTW,
used to drive a drinking water
pump in a waterwork, Germany.
Water operated coupling
type SVTW – horizontal design
flanged to an electric motor.
The water required for power transmission can
be taken from and fed back into a cooling water
or service water system. It is also possible to
pipe the medium delivered by the pump through
the water coupling.
Performance spectrum of the variable speed
coupling type SVTW
By relating power and motor speed, the relevant
coupling size can be identified from the selection
Exemplary water supply for SVTW
2 Shut-off valve
Input power [kW]
500 600 720 9001000 1200 1500 1800
Input speed [rpm]
circuit is possible
No operating range
Accessories shown as figures 1, 2, 3, and 4
are mounted to the water coupling.
Sizes 422-1000 are deliverable both in horizontal
and vertical version. Sizes 1190 and 1390 are
deliverable as vertical version only.
Voith Turbo GmbH & Co. KG
Variable Speed Drives
P.O. Box 1555
74555 Crailsheim, Germany
Tel. +49-7951 32-0
Fax +49-7951 32-650
Cr 294 en MSW/WA 06.06 3000 Dimensions and illustrations non-committal, subject to change.