10
July 2020
Installation, Operation and Maintenance Manual
MAN616_EAC Rev. 5
Section 2: Installation
Installation
Table 5.
Position
If required, for the standard models size 0.3 to 6, Biffi can supply an insert bush with
un-machined bore in accordance with Biffi standard table SCN6202. On request the insert
bush bore can be machined by Biffi to couple the valve stem, provided its dimensions
match the maximum stem acceptance of the bush according to Biffi table TN1005,
enclosed. The particular execution of the flange and bushing allow the actuator to be
rotated by 90° in 4 different positions according to the following figure:
Figure 5
Insert Bush + Intermediate Coupling Flange
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
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.
Housing
Drive sleeve
Snap ring
Adaptor flange
Standard position 1
Position 2
Position 3
Position 4
Flow line
Drive sleeve
Insert bush
Insert bush
N
.4 h
ole
s flan
ge
N
.8 h
ole
s flan
ge
