17
Installation, Operation and Maintenance Manual
MAN 571_EAC Rev. 1
September 2020
Installation
Section 2: Installation
The Biffi insert bush with 2 external keys at 45° allows to position the keyway for the valve
every 90°. Consequently actuator can be mounted in 4 positions at 90° on top of the valve.
For biggest actuator models, the bore of the yoke can be machined according to the
dimensions of valve stem.
Flow line
N
.4 h
ole
s flan
ge
N
.8 h
ole
s flan
ge
Drive sleeve
Snap ring
Housing
Insert bush
Insert bush
Adaptor flange
Drive sleeve
Standard position 1
Position 2
Position 3
Position 4
Position 2
Position 3
Position 4
Rotate insert-bush 180° around
vertical-standard position (1)
Rotate insert-bush 180° around
axis A-A, from position (2)
Rotate insert-bush 180° around
axis A-A, from position (1)
Insert bush turned upside down
Figure 16
Insert Bush + Intermediate Coupling Flange
Table 4.
