Travel Motion; Fail-Safe Position; Pressure Test - Samson 3256 Mounting And Operating Instructions

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

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).
5.4.4

Pressure test

The plant operator is responsible for per-
forming the pressure test.
Tip
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 for both the valve and plant.
EB 8065 EN
Installation
5-17