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A33/A51
2
Fig. 5-4: Mounting using rods (form C), 350 cm²
5.3 Changing the mounting
type
The mounting type of actuators with 120 cm²
actuator area can be changed subsequently.
Note
The table in 'Mounting types' in the 'Design
and principle of operation' section provides
an overview of the possible combinations
(form B and form C).
5.3.1
Changing the mounting
type to mounting using
rods (form B to form C)
Note
For mounting the rods, two bushings (A12)
are required to adapt it to the rod diameter.
EB 8317 EN
A60
2
A33/A51 Rod
A54
A60
A54
1. Remove the clamps of the stem connec-
tor.
2. Unscrew the central nut (98).
3. Lift the actuator off the valve bonnet (2).
4. Undo the rod nuts (A72).
5. Remove the crossbeam (A17).
6. Screw bushings (A12) onto the thread of
the rods.
7. Place the rods (A11) with the bushings
(A12) screwed onto them on the valve
bonnet (2). Place the rod nuts (A72) on
the bushings (A12) and tighten in alter-
nating sequence. Observe tightening
torques.
8. Fail-safe action "stem extends": position
the stem connector clamps 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 clamps of the stem con-
Installation
Valve bonnet
Rod nut
Plate
5-5
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