Samson 3253, Перевод оригинальной инструкции

Страница: 18 / 92

3-4 EB 8055 EN
Design and principle of operation
Bypass and shut-off valves
We recommend installing a shut-off valve
both upstream of the strainer and down -
stream of the valve and installing a bypass
line. The bypass ensures that the plant does
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
Versions with bellows seal fitted with a test
connection (G
1 /
8
) at the top flange allow the
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.
3.4 Accessories
Information Sheet
u
T 8350
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.
More information is available in Data Sheet
u
T 8055.
Noise emissions
SAMSON is unable to make general state-
ments about noise emissions. The noise emis -
sions depend on the valve version, plant fa -
cilities and process medium.
Note