Samson 44-2 Mounting And Operating Instructions page 32

Malfunctions
Table 5: Troubleshooting
Malfunction
Jerky control
response
Slow control response
Downstream pressure
hunts
Loud noises
Leakage at the inspection
bore
Leakage at the dia-
phragm stem
Red mark appears at the
diaphragm rupture indi-
cator.
NOTICE
!
Risk of TÜV approval (based on AGFW worksheet FW 504) for Types 44-3 and 44-9 be-
coming void.
Consult SAMSON's After-sales Service before you change parts or perform service or repair
work on TÜV-tested Type 44-3 and Type 44-9 Regulators.
32
Possible reasons
Increased friction, e.g. due to for-
eign particles between seat and
plug or in the stem guide on the
bonnet.
Control line blocked by dirt caus-
ing the flow through it to be re-
stricted.
Regulator too large
Pressure tapped at the wrong
place (regulator with external
control line).
The restriction in the control line
for pressure tapping is missing.
High flow velocity, cavitation.
Defective operating diaphragm
Dirt in the seal of the actuator
casing and diaphragm stem
Defective operating diaphragm
Recommended action
Î Remove foreign particles.
Î Replace damaged parts.
Î Clean the control line.
Î Check the sizing.
Î Change K /C coefficient, if necessary or install
VS V
a different sized regulator.
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.
Î Replace the diaphragm stem and actuator cas-
ing.
Î Replace damaged diaphragm.
EB 2623-1 EN