Samson series 43 - Version with Safety Thermostat

6 EB 2173 EN
Design and principle of operation
The regulators consist of a three-way valve
made of red brass and a control thermostat
with set point adjuster, capillary tube, and
temperature sensor.
The Type2430K Thermostat is attached to
the valve body using the coupling nut.
The temperature regulators work according
to the adsorption principle.
The temperature of the controlled medium
creates a pressure in the sensor which is pro-
portional to the measured temperature. This
pressure is transferred through the capillary
tube (11) to the operating element (12) and
converted into a positioning force.
This force acts on the operating bellows (9)
and the pin of the operating element (10)
which moves the plug stem and plug (3). By
turning the set point adjuster (8), the point of
response is changed over the spring (7). As
a result, the valve plug moves through its
travel range within a higher or lower tem-
perature range measured by the sensor.
Depending on its plug arrangement, the
three-way valve is either used for mixing or
diverting service.
In mixing valves, the process media to be
mixed enter at valve ports A and B. The
combined ow exits the valve at port AB.
When the temperature rises, port A opens
and port B closes.
In diverting valves, in contrast, the process
medium enters at the valve port AB and the
partial ows exit at ports A and B. When the
temperature rises, port A closes and port B
opens.
3.1 Version with safety ther-
mostat
When a Type2403K Safety Thermostat is
attached to the valve or the regulator, this
combination functions as a safety tempera-
ture monitor (STM) or a temperature regula-
tor with safety temperature monitor (TR/
STM).
Details in Data Sheet uT2183 and Mount-
ing and Operating Instructions uEB2183.
When a Type2439K Safety Thermostat is
attached, this version functions as a safety
temperature limiter (STL). Details in Data
Sheet uT2185 and Mounting and Operat-
ing Instructions uEB2185.
Tested safety equipment (according to DIN
EN)
Note:
A SAMSON thermowell must be
used when a sensor in versions tested
according to DIN EN is used with a
thermowell.
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