Samson series 43, Mounting And Operating Instructions

 12  

EB 2172 EN

Maintenance – Replacing parts

6  Maintenance – Replacing 

parts

See Fig. 1.

The temperature regulators do not require 
any maintenance. Nevertheless, they are 
subject to natural wear, particularly at the 
seat and plug.
Depending on the operating conditions, 
check the regulator at regular intervals to 
avoid possible malfunctions.
If the temperature exceeds the value adjusted 
at the temperature sensor, possible causes 
for this are:

–

The thermostat is defective due to exces-
sive temperatures.

–

Valve seat and plug are contaminated 
with dirt.

–

Seat and plug leak due to natural wear.

Before performing any work on the tempera-
ture regulator, we recommend removing the 
valve from the pipeline.

WARNING!

Risk of injury due to process medium 

escaping possibly under pressure.

Depressurize the relevant section of 
the pipeline and, if necessary, drain 

it as well. When used at high tem

-

peratures, allow the plant section to 

cool down to ambient temperature.

Exceptional operating and installation condi-
tions can lead to changed situations that 
may affect the control response and lead to 
malfunctions. In such cases, check the instal-
lation conditions, process medium, tempera-
ture and pressure conditions.
For initial evaluation of faults and how to 
remedy them, refer to Table 2 on 
page 14.
The table is not intended to be exhaustive as 
there are diverse reasons for malfunctions.

6.1  Cleaning or replacing the 

plug

To change the plug (3), a special plug 
wrench is needed:
For DN 15 to 25 Order no.: 1280-3001

For DN 32 to 50 Order no.: 1280-3007
To change the seat (2), a special seat wrench 
is needed:
For DN 15 to 25 Order no.: 1280-3012

For DN 32 to 50 Order no.: 1280-3013
The tools are available from SAMSON.