Samson 2417 Series Mounting And Operating Instructions page 46

Malfunctions
Table 9: Troubleshooting
Malfunction
Jerky control
response
Slow control response
Upstream pressure
fluctuates
Loud noises
Leakage at the
actuator.
Leakage at the bellows
extension.
Red mark appears at
the diaphragm rupture
indicator (actuator
with two diaphragms).
46
Possible reasons
Increased friction, e.g. due to foreign
particles between seat and plug.
Control line or restriction blocked by
dirt causing the flow through it to be
restricted.
Regulator or K /C coefficient too
VS V
large
Pressure tapped at the wrong place
(regulator with external control line).
The restriction in the control line for
pressure tapping is too small or miss-
ing.
High flow velocity, cavitation.
Defective operating diaphragm/
bellows.
Defective bellows seal
Defective operating diaphragm
Recommended action
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service depart-
ment.
Î Clean the control line.
Î Clean the restriction.
Î Check the sizing.
Î Change K /C coefficient, if necessary or in-
VS V
stall a different sized regulator.
Î Contact SAMSON's After-sales Service depart-
ment.
Î Reconnect the control line at another point.
Î Do not connect the control line at pipe bends or
necks.
Î Install a restriction.
Î Check the sizing.
Î Install larger regulator, if necessary.
Î Replace damaged diaphragm/bellows.
Î Replace bellows seal.
Î Contact SAMSON's After-sales Service depart-
ment.
Î Replace damaged operating diaphragm.
EB 2517 EN