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Malfunctions
Table 5: Troubleshooting
Malfunction
Slow control response
Upstream pressure
fluctuates
Loud noises
Leakage at the inspection
bore
Leakage at the
diaphragm stem
Red mark appears at the
diaphragm rupture
indicator.
NOTICE
!
Risk of TÜV approval (based on AGFW worksheet FW 506) for Type 44-4 becoming void.
Consult SAMSON's After-sales Service before you change parts or perform service or repair
work on TÜV-tested Type 44-4 Regulators.
38
Possible reasons
Control line blocked by dirt
causing the flow through it to be
restricted.
Regulator or K
/C
coefficient
VS
V
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 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
casing.
Î Contact SAMSON's After-sales Service to
replace a damaged operating diaphragm.
EB 2723 EN
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