16
EB 2171 EN
Design and principle of operation
3 Design and principle of oper-
ation
Î
The Type 43-1 (or Type 43-2) Regulator con-
sists of a Type 2431 (or Type 2432) Globe
Valve and a Type 2430 Control Thermostat
with set point adjuster, a capillary tube and
temperature sensor.
A temperature sensor operating according to
the adsorption principle is used as standard.
Details on the Type 2430 Control Thermostat
with a temperature sensor operating accord-
ing to the vapor pressure principle can be
found in the mounting and operating instruc-
tions
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The valve bodies are made of red brass,
spheroidal graphite iron or stainless steel.
The Type 2430 Control Thermostat is at-
tached to the valve body (1) using the cou-
pling nut (15).
The temperature regulators work according
to the adsorption principle. The temperature
of the medium creates a pressure in the sen-
sor (19) which is proportional to the mea-
sured temperature. This pressure is trans-
ferred through the capillary tube (10) to the
operating element (13) and converted into a
positioning force. This force causes the pin of
the operating element (12) to move the plug
stem (4) with the plug (3) balanced by a pis-
ton. The plug is pressure-balanced.
By turning the set point adjuster (8), the
Note
point of response is changed over the valve
spring (5). As a result, the temperature set
point is changed.
The Type 43-1 and Type 43-2 Regulators are
suitable for plants to be heated.
The valves close when the temperature rises.
Version with safety thermostat
When a Type 2439 or Type 2403 Safety
Thermostat is attached to the valve or the
regulator, this combination functions as a
safety temperature limiter (STL) or a tempera-
ture regulator with safety temperature limiter
(TR/STL).
Details in mounting and operating instruc-
tions
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EB 2185 (STL);
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EB 2083 (STM).
Version with double adapter
The temperature regulator can be equipped
with a double adapter to connect an addi-
tional control thermostat to control a further
control variable.
See Data Sheet
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Version with handwheel
For the manual operation of the valve. The
manual adjuster can either be attached di-
rectly to the valve instead of a control ther-
mostat or at the double adapter.
See Data Sheet
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