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7
Malfunctions
Contents
7.1
Malfunctions
Pressurized parts
Malfunctions and ab-
normalities
HON 5020 gas pressure regulator with HON 640a / HON 642a pilot
Topic
Malfunctions
Risk of serious injury posed by pressurized components moving in an uncontrolled manner
when handled improperly.
If not handled properly or in the event of a defect, gas can escape from pressurized compo-
nents under high pressure and cause serious injuries and even death. Before you start work-
ing on these components:
Close all connections leading to the gas-carrying line.
Establish a depressurized status. Residual amounts of energy must be depressurized 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
Filter: The filter is dirty
Pilot: The diaphragm is defective
The regulator unit does
not open
Actuator assembly: The diaphragm
of the regulator unit is defective
Check the setting of the target
value
The pressure that needs to
be regulated is not being
The pilot is defective
regulated
The sealing pressure is too
The regulator unit is leaking due to
high
contamination or damage
Malfunctions
Page
Correction
Replace the filter as specified in
Maintaining the pilot (see page 52)
Replace the diaphragm as specified
in Maintaining the pilot (see page
52)
Replace the actuator assembly
diaphragm as specified in Main-
taining the actuator assembly (see
page 49)
Check the setpoint as specified in
the Adjusting the settings of the
device (see page 41) section
Check the pilot and replace it with a
new pilot if necessary as specified
in Maintaining the pilot (see page
52)
Perform maintenance on the
actuator assembly as specified in
Maintaining the actuator assembly
(see page 49)
44
44
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