Samson 3251-E, Mounting And Operating Instructions

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5-18 EB 8052-E EN
Installation
5.1 8 164 163.1
163.2
162
2
92
Fig. 5-11: Packing must be replaced
Legend for Fig. 5-8 to Fig. 5-11
2 Valve bonnet
5.1 Plug or piston stem
8 Guide bushing
92 Castellated nut
162 Packing gland
163 Spring loading assembly
163.1 Guide bolt
163.2 Belleville washers
164 Stud for packing gland
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.
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.
Tip