Samson 3222 Series User Manual

EB 5866 EN 5-7
Installation
3. Depressurize the pipeline section and
valve.
4. Rework any parts that leak and repeat
the leak test.
5.4.2 Travel motion
The movement of the actuator stem must be
linear and smooth.
Î Apply the maximum and minimum con-
trol signals to check the end positions of
the valve while observing the movement
of the actuator stem.
Î Check the travel reading at the travel in-
dicator scale.
5.4.3 Fail-safe position
Fail-safe position with pneumatic actuators
Î Shut off the signal pressure line.
Î Check whether the valve moves to the
fail-safe position (see the 'Design and
principle of operation' section).
Fail-safe position for electric actuators and
electric actuators with process controller
with fail-safe action
Î Switch off the supply voltage.
Î Check whether the valve moves to the
fail-safe position.
5.4.4 Pressure test
The plant operator is responsible for per-
forming the pressure test.
Our after-sales service can support you to
plan and perform a pressure test for your
plant.
During the pressure test, make sure the fol-
lowing conditions are met:
− Retract the plug stem to open the valve.
− Observe the maximum permissible pres-
sure or differential pressure for both the
valve and plant.
Tip

Samson 3222 Series Specifications

General

Brand	Samson
Model	3222 Series
Category	Valve Positioners
Language	English