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forms can be vented to the atmosphere (to
avoid excess pressure in the device). Further-
more, the vent plugs allow air intake to pre-
vent a vacuum from forming in the device.
Î Locate the vent plug on the opposite side
to the work position of operating person-
nel.
5.2 Preparation for installation
Before installation, make sure the following
conditions are met:
− The valve is clean.
− The valve and all valve accessories (in-
cluding piping) are not damaged.
− The valve data on the nameplate (type
designation, valve size, material, pres-
sure rating and temperature range)
match the plant conditions (size and
pressure rating of the pipeline, medium
temperature etc.). See the 'Markings on
the device' section for nameplate details.
− The requested or required additional
pipe fittings (see the 'Additional fittings'
section) have been installed or prepared
as necessary before installing the valve.
NOTICE
!
Risk of control valve damage due to incor-
rect insulation.
Î Only insulate control valves with insulat-
ing section or bellows seal up to the bon-
net flange of the valve body for medium
temperatures below 0 °C and above
220 °C. If the insulating section is insu-
lated, it will not function properly.
EB 8055 EN
Î Do not insulate valves mounted to com-
ply with NACE MR0175 requirements
and which have nuts and bolts that are
not suitable for sour gas environments.
Proceed as follows:
Î Lay out the necessary material and tools
to have them ready during installation
work.
Î Flush the pipelines.
Note
The plant operator is responsible for clean-
ing the pipelines in the plant.
Î For steam applications, dry the pipelines.
Moisture will damage the inside of the
valve.
Î Check any mounted pressure gauges to
make sure they function properly.
Î When the valve and actuator are al-
ready assembled, check the tightening
torques of the bolted joints (u AB 0100).
Components may loosen during trans-
port.
5.3 Mounting the device
The activities listed below are necessary to
install the valve and before it can be started
up.
NOTICE
!
Risk of valve damage due to excessively
high or low tightening torques.
Observe the specified torques when tighten-
ing control valve components. Excessive
Installation
5-3
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