Samson 3271 - Page 30

5-2 EB 8026 EN
Installation
valve conditions or states of the medium
process deviate.
Î Install the valve free of stress and with the
least amount of vibrations as possible.
Read information under “Mounting posi-
tion” and “Support or suspension” in this
chapter.
Î Install the valve allowing sufcient space
to remove the actuator and valve or to
perform service work on them.
Î In heating or cooling applications, the
valve can be installed in the ow pipe or
return ow pipe (see Fig.5-1).
Mounting position
Generally, SAMSON recommends installing
the valve with the actuator upright and on
top of the valve.
In the following versions, the valve must be
installed with the actuator on top:
− Valves in DN100/NPS4 and larger
− Valves with insulating section for low
temperatures below –10°C (14°F)
Î Contact SAMSON if the mounting posi-
tion is not as specied above.
Support or suspension
The plant engineering company is responsi-
ble for selecting and implementing a suitable
support or suspension of the installed control
valve and the pipeline.
Depending on the valve version and mount-
ing position, the valve, actuator and pipeline
must be supported or suspended.
Valves, which are not installed in the pipe-
line in the upright position with the actuator
on top, must be supported or suspended.
Valve accessories
Î During connection of valve accessories,
make sure that they are easily accessible
and can be operated safely from the
work position.
Vent plugs
Vent plugs are screwed into the exhaust air
ports of pneumatic and electropneumatic de-
vices. They ensure that any exhaust air that
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.
Note
AAB
B
A
AB
B
A
AB
B
AAB
B
A
AB
B
A
AB
B
A
AB
B
AB
A
B
Heating with diverting valve (FA) or cooling with diverting valve (FE)
Installation in return ow pipe Installation in ow pipe
Flow pipe
Installation in return ow pipeInstallation in ow pipe
Heating with mixing valve (FA) or cooling with mixing valve (FE)
Fail-safe action: FA = "Actuator stem extends", FE = "Actuator stem retracts"
In heating applications with FA, the heating medium (ow) is shut off in the fail-safe position,
in cooling applications with FE, cooling is maintained in the fail-safe position.
Mixing service
Temperature control Q = constant
Diverting service
Flow control Q = 0 to 100 %
Flow pipe
Flow pipe
Flow pipe
Flow pipe
Return ow
pipe
Return ow
pipe
Return ow
pipe
Return ow
pipe
Flow pipe
Flow pipe Flow pipe
Return ow
pipe
Return ow
pipe
Return ow
pipe
Return ow
pipe
Fig.5-1: Typical installations