Mounting The Actuator Onto The Valve - Samson 3371 Mounting And Operating Instructions

5.2.1 Mounting the actuator
onto the valve
Tip
The valve and actuator are assembled with
special attention paid to the actuator's bench
range and direction of action. These details
are specified on the actuator nameplate (see
the 'Markings on the device' section).
a) 120 cm² actuator area
Mounting using crossbeam (form B, see
Fig. 5-2)
NOTICE
!
Incorrect removal will damage the actuator.
Î Do not loosen the rod nuts (A72) that
hold the crossbeam (A17) on the rods
(A11).
1. Remove the clamps of the stem connector
(A30) from the actuator.
2. Unscrew the central nut (98) from the
valve bonnet (2).
3. Firmly press the plug together with the
plug stem into the seat ring.
4. Place the actuator with the crossbeam
(A17) onto the thread of the valve bon-
net (2), making sure that the central nut
(98) is placed over the plug stem and
fasten it to the valve bonnet. Observe
tightening torques.
EB 8317 EN
5. Fail-safe action "stem extends": position
the stem connector clamps (A30) and
screw them tight. Observe tightening
torques.
Fail-safe action "stem retracts": apply
pressure to the top diaphragm chamber
until the actuator stem touches the plug
stem. Position the stem connector clamps
(A30) and screw them tight. Observe
tightening torques.
Mounting using rods (form C, see Fig. 5-3)
1. Remove the stem connector clamps (A31)
from the actuator.
2. Screw the bushings (A12) onto the rods
(A11) and place them in the correspond-
ing holes on the valve bonnet (2).
3. Tighten the rod nuts (A72) in alternating
sequence. Observe tightening torques.
4. Fail-safe action "stem extends": position
the stem connector clamps (A31) and
screw them tight. Observe tightening
torques.
Fail-safe action "stem retracts": apply
pressure to the top diaphragm chamber
until the actuator stem touches the plug
stem. Position the stem connector clamps
(A31) and screw them tight. Observe
tightening torques.
Installation
5-3