Additional Fittings; Valve Accessories; Technical Data - Samson 3349 Mounting And Operating Instructions

3.3 Additional fittings

Strainers
We recommend installing a SAMSON
strainer upstream of the valve. It prevents sol-
id particles in the process medium from
damaging the valve.
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.
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.
EB 8048-2 EN
Design and principle of operation

3.4 Valve accessories

Valve accessories
A Type 3724 Positioner is frequently used
when the Type 3349 Angle Valve is com-
bined with a Type 3379 Pneumatic Piston
Actuator.

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 8048-2.
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.
Temperature range
Depending on the version, the control valve
is designed for a temperature range from
–10 to 160 °C (14 to 320 °F).
3-5