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© 11.2023
*) Excessive damping limits the actuation speed.
**) Normal flow noise does not constitute a fault. However, this noise can be reduced by installing a noise reduction device.
Note
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 or damaged
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 the regulator configuration
Vibration resonance in the control system
Install restrictor plate in breather line
Install baffle plate in measuring line (see p. 29)*. Install a
stronger spring (setpoint spring of the next higher control
range)
Check setting of gas consumption devices
Use of throttle valve RSD2 (optional accessory)
Control deviation
too large /
setpoint is not
reached
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
Wrong control cone selection
Check regulator configuration, setpoint spring / control cone
and replace 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
Continue opening restrictor (throttle valve RSD2 available as
an option) in measuring line by turning anticlockwise
Remove restrictor plate from breather line
Check breather lines and dimension them larger, if
necessary. Replace breather valve with safety diaphragm or
breather line
Closing speed of downstream shut-off devices
too high
Reduce closing speed of shut-off valve
Noise
Gas velocity too high Check the regulator configuration
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
Internal leakage gas SRV is set too low or is not
tight
Correct settings of leakage gas SRV
Check O-ring for damage and dirt, replace if necessary
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