Samson 44-4, Mounting And Operating Instructions

Page: 31 / 44

EB 2723 EN 31
Malfunctions
Table 5: Troubleshooting
Malfunction Possible reasons Recommended action
Upstream pressure
exceeds the adjusted
set point.
Insufficient pressure pulses on the
operating diaphragm.
Î
Connect the control line on site for regulators
with external control line.
Î
Clean the control line and screw fittings.
Pressure tapped at the wrong place
(regulator with external control line).
Î
Reconnect the control line at another point.
Î
Do not connect the control line at pipe bends or
necks.
Regulator installed against the flow.
Î
Install the regulator so that the direction of flow
matches the direction indicated by the arrow on
the body.
Regulator or K
VS
/C
V
coefficient too
small
Î
Check the sizing.
Î
Change K
VS
/C
V
coefficient, if necessary or install
a different sized regulator.
Foreign particles blocking the plug
Î
Remove foreign particles.
Î
Replace damaged parts.
Defective operating diaphragm
Î
Replace damaged diaphragm.
Seal the inspection borehole.
Î
Open the inspection borehole.
Pressure drops below
the adjusted set point.
Foreign particles blocking the plug
Î
Remove foreign particles.
Î
Replace damaged parts.
Seat and plug are worn or leak.
Î
Replace the damaged seat and plug.
Pressure tapped at the wrong place
(regulator with external control line).
Î
Reconnect the control line at another point.
Î
Do not connect the control line at pipe bends or
necks.
Regulator or K
VS
/C
V
coefficient too
large
Î
Check the sizing.
Î
Change K
VS
/C
V
coefficient, if necessary or install
a different sized regulator.
Control line blocked
Î
Clean the control line and screw fittings.
Strainer blocked.
Î
Clean strainer.
Jerky control
response
Increased friction, e.g. due to
foreign particles between seat and
plug or in the stem guide on the
bonnet.
Î
Remove foreign particles.
Î
Replace damaged parts.
Slow control response
Control line blocked by dirt causing
the flow through it to be restricted.
Î
Clean the control line.