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© 05.2022
9 Troubleshooting
9.1 Gas Pressure Regulator
Description of the error
Possible cause
Elimination
Closing pressure too
high
No closing pressure
Actuator dirty or damaged
Check valve plate (seal) and valve seat for damage
and dirt, replace valve plate, if necessary
Static sealing elements defective
Replace O-rings
Clamping of the compensating
diaphragm has come off
Compensating membrane is damaged
or mounted incorrectly
Check compensating diaphragm for fastening,
damage, and correct fit, replace it, if necessary
Valve plate has become disconnected
from the valve stem
Tighten nut under the valve plate
Valve plate dirty
Clean the valve plate (use exclusively NBR-
compatible cleaning agent)
Unstable outlet
pressure curve
(vibrations, pulsation)
Device is working in the closing
pressure range
Check regulator design
Vibration resonance in the control
system
Install restrictor plate in breather line
Install baffle plate in measuring line
Continue closing restrictor in measuring line by
turning clockwise *
Install a harder spring (setpoint spring of the next
higher control range)
Check setting of gas consumption devices
Use of throttle valve RSD (optional accessory)
Control deviation too
large
Unfavorable connection of the
measuring line
Select a measuring point with steady flow, check
measuring point
Sluggishness of the device due to dirt
Subject device to maintenance
Main diaphragm or compensating
diaphragm defective or mounted
incorrectly
Check diaphragm and replace it, if necessary
Wrong regulator size selected
Wrong setpoint spring selected
Check regulator design
Check setpoint spring and replace it, if necessary
Inlet pressure supply is insufficient
(pressure losses in the supply line too
high)
Increase inlet pressure
Check pipeline cross-section
Check built-in filter
Inadmissible pressure
peak
Dynamic closing
pressure too high
Damping of the device too high
Control system too dynamic
Remove baffle plate from measuring line
Remove restrictor plate from breather line
Check breather lines, choose a larger diameter, if
necessary
Replace breather valve with breather line
Closing speed of downstream shut-off
devices too high
Reduce closing speed of shut-off valve
Noise
Gas velocity too high
Check regulator design
Sluggishness of the device due to dirt
/ wear
Perform maintenance on actuator
If worn-out mechanically, replace it, if necessary
Gas escapes through
breather line
Fastening of the main diaphragm has
come off
Main diaphragm is damaged or has
been mounted incorrectly
Check diaphragm for fastening, damage, and
correct fit