Samson 3248-1, Mounting And Operating Instructions

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Note:
Seat wrenches can be ordered using the
following order numbers:
For DN 15 to 150: Complete set 1280-3047
For DN 15 and 25: Single set 1280-3073
5.1 Replacing packing, seat, and
plug
Removing the actuator
Prior to performing any work on the valve
body, remove the actuator first.
Note!
For actuators with fail-safe action "Actuator
stem extends" and especially actuators with
pretensioned springs, apply a pressure
slightly higher than the lower signal pressure
range (see actuator nameplate) to the
loading pressure connection on the bottom
diaphragm chamber, before loosening the
annular nut (8.2).
1. Remove clamps of the stem connector (7)
between actuator stem and plug stem
and unscrew annular nut (8.2).
2. Lift the actuator off the valve.
Caution!
To avoid damaging the metal bellows, make
sure that no torque is transmitted to the
bellows welded to the plug stem extension
(6.3, 6.3 b).
Packing
1. Place a wrench at the stem connector nut
(6.1) to hold it stationary and loosen the
lock nut (6.2). Unscrew stem connector
nut and lock nut.
2. Unthread guide bushing (5.2) to relieve
the tension from the packing.
3. Unthread the nuts (5.3) at the valve bon-
net. Lift valve bonnet (5) upwards off the
flanged section of the cryogenic exten-
sion bonnet (1.1) .
4. Unthread threaded bushing (5.2) and
use a suitable tool to remove the pack-
ing rings (4.2), washer (4.3), and spring
(4.1).
Replace damaged parts with new ones.
Carefully clean the packing chamber.
EB 8093 EN
9
Maintenance
Fig. 3 · Sectional drawing