Equipment/ functions - Process Valve Solutions

Magnetic limit and torque transmitter (MWG) (option)
The magnetic limit and torque transmitter
converts the mechanical values
of limit and torque into continuous
electronic signals.
The simultaneous use of integral
controls which evaluate the signals
is a prerequisite for the use of the
MWG. This variant does not require
Absolute travel measurement –
without battery
The valve position is determined
using a so called multi-turn-absolute
encoder.
Four shafts, each with a ratio of 8:1,
are used to convert the travel into an
electronic signal. Each valve position
is assigned an unambiguous
combination of the 4 shaft positions.
Magnets and hall sensors register
the shaft positions electronically.
As soon as the power supply has
been restored after a power failure,
the current valve position is immediately
available; a reference operation
is not required. Position changes
due to manual operation during
power failure are registered by the
MWG even without supply voltage. A
battery is not required.
Torque – continuously available
The proven design of the sliding
worm provides the mechanical principle
of torque sensing. A torque at
the output drive results in an axial
movement of the sliding worm
against the spring action. With a
lever, the axial movement is transformed
into a rotary movement. Hall
sensors convert this movement into
an electronic signal.
any switches for limit positions or
torque.
Actuators with MWG have the following
advantages.
■ Non-intrusive setting is possible
(see page 12)
Torque signal
to the controls
Travel/ position signal
to the controls
Equipment/ functions
■ A torque signal is permanently
available. It can be used for
switching off at the set tripping
torque. It can also be transmitted
for external use, for example for
torque monitoring at the valve.
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