Malfunctions
HON 380 gas pressure regulator with HON 673/674 controller 37
7 Malfunctions
Topic Page
Malfunctions 37
7.1 Malfunctions
Risk of serious injury posed by pressurized components moving in an uncon-
trolled manner when handled improperly.
If not handled properly or in the event of a defect, gas can escape from pressur-
ized components under high pressure and cause serious injuries and even death.
Before you start working on these components:
Close all connections leading to the gas-carrying line.
Establish a depressurized status. Residual amounts of energy must be depres-
surized as well.
The following table contains a description of malfunctions and abnormalities that
may occur during the operation and lists procedures to correct them:
Malfunction Possible causes Correction
Regulator unit does
not open
Regulator unit malfunction
Performing maintenance on
regulator unit (see page 47)
The regulator unit will
not close
Faulty regulator unit Performing maintenance on
regulator unit (see page 47)
The regulator unit is
opening/closing too
slowly
The regulator’s control speed is
not correct
Regulating the regulator’s con-
trol speed, Adjusting the throt-
tle valve on the measuring line
of the regulator unit (see page
36)
Diaphragm of the regulator
unit is defective
Perform maintenance on regu-
lator unit (see page 47), possi-
bly replace regulator unit
The pressure that
needs to be regulated
is not being regulated
The regulator unit’s pilot spring
is not compatible with the de-
sired control range
Remove the pilot spring and
check the color code against
the control ranges listed in the
spare parts list
Pilot spring of the regulator
unit is defective
Remove the pilot spring and
check it for damage
The sealing pressure is
too high
The control diaphragm is too
hard
Check the regulator unit’s con-
trol diaphragm
The edge of the nozzle is dam-
aged
Check the edge of the nozzle
for damage.
Leaks on the outside
The screws and/or fittings were
not tightened correctly
Check the tightening torques
The gaskets are faulty Check the gaskets for damage
Leaks on the inside
Diaphragm of the regulator
unit defective
Check the regulator unit’s dia-
phragm for damage
Valve plate is defective Check valve plate for damage
abnormalities
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