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Malfunctions
Malfunction
Possible reasons
Seat and plug are worn or leak.
Valve installed against the flow.
Incorrectly installed valve
Strainer blocked.
Regulator or K
Temperature at the
sensor does not
A safety device (e.g. STL or STM) has been
reach the set point.
triggered.
Mixing valve: port B closed
Diverting valve: port A closed
Insufficient heating energy available
Foreign particles blocking the plug
Sensor installed in the wrong location.
Sensor installed incorrectly.
Jerky control
Increased friction, e.g. due to foreign
response
particles between seat and plug.
High flow velocity, cavitation.
Loud flow-induced
noise
Leak between
control thermostat
Valve seal defective
and valve
Note
Contact SAMSON's After-sales Service for malfunctions not listed in the table.
8-2
/C
coefficient too small
VS
V
Recommended action
Î Clean the seat and plug.
Î Contact SAMSON's After-sales Service.
Î Install the valve so that the direction of flow
matches the direction indicated by the arrow
on the body.
Î During installation, observe the correct
direction of flow and arrangement of the ports
A/B/AB.
Î Clean the strainer.
Î Check the sizing.
Î Install a suitable valve.
Î Contact SAMSON's After-sales Service.
Î Check plant. Unlock safety device (where
necessary).
Î Draw up an energy balance.
Î Remove foreign particles.
Î Contact SAMSON's After-sales Service.
Î Change the mounting position.
Î Immerse the temperature sensor with its entire
immersion depth in the process medium.
Î Avoid an installation site where idle times or
heat buildup can occur.
Î Remove foreign particles.
Î Contact SAMSON's After-sales Service.
Î Check the sizing.
Î Install larger regulator, if necessary.
Î Contact SAMSON's After-sales Service.
EB 2173 EN
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