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Design and principle of operation
The differential pressure across the plant is
transmitted over the high pressure and low
pressure lines to the operating diaphragm
(13) where it is converted into a positioning
force. This force moves the plug according to
the force of the set point springs (16).
The set point springs are mounted inside the
actuator for a fixed set point (Type 42-28).
These springs can be adjusted externally for
an adjustable set point (Type 42-24).
Control lines (20) mounted on site transfer
the high pressure and low pressure in all ver-
sions.
Type 2424 and Type 2428 Actuators are
equipped with an overload protection (21). It
prevents a rise in differential pressure during
extreme operating conditions (e.g. vacuum
at the heat exchanger) by opening an inter-
nal excess pressure limiter. As a result, plants
and the regulator itself are protected against
excessively high differential pressures.
8
EB 3003 EN
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