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Table 5: Troubleshooting
Malfunction
Downstream pressure
drops below the adjusted
set point.
Downstream pressure
exceeds the adjusted set
point.
EB 2623-1 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
Safety device, e.g. pressure limit-
er, has been triggered
Strainer blocked.
Foreign particles blocking the
plug
Seat and plug are worn or leak.
Pressure tapped at the wrong
place (regulator with external
control line).
Seal the inspection borehole.
Regulator or K
/C
coefficient
VS
V
too large
Control line blocked
Defective operating diaphragm
Recommended action
Î Connect the control line on site for regulators
with external control line.
Î Clean the control line and screw fittings.
Î Draw up an energy balance.
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 Check plant. Unlock safety device.
Î Clean strainer.
Î Remove foreign particles.
Î Replace damaged parts.
Î Clean the seat and plug.
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 Open the inspection borehole.
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 Replace damaged diaphragm.
Malfunctions
31
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