Samson 3351 - Mounting the Actuator Onto the Valve; Installing the Valve into the Pipeline

5-4 EB 8039 EN
Installation
5.3.1 Mounting the actuator
onto the valve
Risk of personal injury due to preloaded
springs.
The valve is tted with an actuator with pre-
loaded springs that are under tension.
Î Before starting any work on the control
valve, relieve the compression from the
preloaded springs. See 'Relieving the
spring compression in the actuator' in the
'Removal' section.
TheType3351ControlValveisdeliveredby
SAMSON with the actuator ready mounted
on the valve.
5.3.2 Installing the valve into
the pipeline
Premature wear and leakage due to insuf-
cient support or suspension.
Î Support or suspend the valve sufciently
at suitable points.
Directionofow
Thedirectionofthemediumowinthevalve
depends on the process medium and the se-
lected fail-safe action:
Table5-2: Direction of ow
Fail-safe
action
Process
medium Valve size
Flow direction
AB BA
Fail-close Vapor/gas
DN15to80
NPS½to3
FTC
1)
–
Fail-close Vapor/gas
DN100
NPS4
– FTO
1)
Fail-close Liquid
DN15to
100
NPS½to4
– FTO
1)
Fail-open
Vapor/
gas/liquid
DN15to
100
NPS½to4
FTO
1)
–
1)
FTO(ow-to-open)
FTC(ow-to-close)
Installing the control valve
1. Closetheshut-offvalvesinthepipeline
at the inlet and outlet of the plant section
while the valve is being installed.
2. Prepare the relevant section of the pipe-
line for installing the valve.
3. Remove the protective caps from the
valve ports before installing the valve.
4. Lift the valve using suitable lifting equip-
ment to the site of installation (see infor-
mation under 'Lifting the valve' in the
'Shipment and on-site transport' section).
Observetheowdirectionthroughthe
valve(seeprecedingparagraph“Direc-
tionofow”).
5. Makesurethatthecorrectangegaskets
are used.
6. Bolt the pipe to the valve free of stress.
7. Attach a support or suspension on the
valve, if necessary.
WARNING
!
NOTICE
!