4
Maintenance ·
Troubleshooting
The regulators are maintenance free. Never-
theless, they are subject to natural wear, par-
ticularly at the seat, plug and operating dia-
phragm.
Depending on the operating conditions, the
regulator needs to be checked at regular in-
tervals to avoid possible malfunctions.
CAUTION!
On performing any work on the regulator,
make sure the relevant section of the pipeline
is depressurized and, depending on the pro-
cess medium, drained as well.
For high temperatures, allow the regulator to
cool down to ambient temperature before
starting any work on it.
Interrupt or shut off the control line to avoid
any hazards which could be caused by mov-
ing parts.
As valves are not free of cavities, remember
that residual process medium might still be
contained in the valve.
We recommend to remove the valve from the
pipeline after it has been depressurized and
drained. Make sure that all the plant sections
connected to the control line are also
depressurized. If this is not the case, shut off
the control line.
Details on malfunctions and the recom-
mended action can be found in the
Ta-
ble 3 · Troubleshooting
.
Proceed as described in section 4.1 if the op-
erating diaphragm is defective.
18
EB 3013 EN
Maintenance · Troubleshooting
