Samson 44-7 Mounting And Operating Instructions page 32

Malfunctions
Table 5: Troubleshooting
Malfunction
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 Types 44-4 and 44-8 be-
coming void.
Consult SAMSON's After-sales Service department before you change parts or perform ser-
vice or repair work on TÜV-tested Type 44-4 and Type 44-8 Regulators.
32
Possible reasons
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 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 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 2723 EN