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Table 5: Troubleshooting
Malfunction
Upstream pressure
exceeds the adjusted set
point.
Upstream pressure drops
below the adjusted set
point.
Jerky control
response
EB 2723 EN
Possible reasons
Insufficient pressure pulses on the
operating diaphragm.
Pressure tapped at the wrong
place (regulator with external
control line).
Regulator installed against the
flow.
Regulator or K
/C
coefficient
VS
V
too small
Foreign particles blocking the
plug
Defective operating diaphragm
Seal the inspection borehole.
Foreign particles blocking the
plug
Seat and plug are worn or leak.
Pressure tapped at the wrong
place (regulator with external
control line).
Regulator or K
/C
coefficient
VS
V
too large
Control line blocked
Strainer blocked.
Increased friction, e.g. due to
foreign particles between seat
and plug or in the stem guide on
the bonnet.
Recommended action
Î Connect the control line on site for regulators
with external control line.
Î Clean the control line and screw fittings.
Î Reconnect the control line at another point.
Î Do not connect the control line at pipe bends or
necks.
Î Install the regulator so that the direction of flow
matches the direction indicated by the arrow on
the body.
Î Check the sizing.
Î Change K
/C
coefficient, if necessary or install
VS
V
a different sized regulator.
Î Remove foreign particles.
Î Replace damaged parts.
Î Replace damaged diaphragm.
Î Open the inspection borehole.
Î Remove foreign particles.
Î Replace damaged parts.
Î Replace the damaged seat and plug.
Î Reconnect the control line at another point.
Î Do not connect the control line at pipe bends or
necks.
Î Check the sizing.
Î Change K
/C
coefficient, if necessary or install
VS
V
a different sized regulator.
Î Clean the control line and screw fittings.
Î Clean the strainer.
Î Remove foreign particles.
Î Replace damaged parts.
Malfunctions
37
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