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Design and principle of operation
not need to be shut down for service and re-
pair work on the valve.
Insulation
Control valves can be insulated to reduce
heat energy transfer. Refer to the instructions
in the 'Installation' section.
Test connection
1)
Versions with bellows seal fitted with a test
connection (G
) at the top flange allow the
1
/
8
sealing ability of the bellows to be moni-
tored.
Particularly for liquids and vapors, we rec-
ommend installing a suitable leakage indica-
tor (e.g. a contact pressure gauge, an outlet
to an open vessel or an inspection glass).
Safety guard
For operating conditions that require in-
creased safety (e.g. in cases where the valve
is freely accessible to untrained staff), a safe-
ty guard must be installed to rule out a crush
hazard arising from moving parts (actuator
and plug stem). Plant operators are responsi-
ble for deciding whether a guard is to be
used. The decision is based on the risk posed
by the plant and its operating conditions.
Noise reduction
A further noise reduction can only be
achieved by using additional insulation as
the steam conditioning valve is already
equipped with flow divider 3.
Only in installed valves fitted with a bellows seal
1)
3-4
3.4 Valve accessories
Information Sheet u T 8350
Depending on the excessive heat that radi-
ates from the steam conditioning valve, only
mount valve accessories (e.g. positioners) on
the inlet side of the cooling water valve.
3.5 Technical data
The nameplates on the valve and actuator
provide information on the control valve ver-
sion. See the 'Markings on the device' sec-
tion.
Note
More information is available in Data Sheet
u T 8251.
EB 8251 EN
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