December 2020
Installation, Operation and Maintenance Manual
MAN 606 Rev. 5
Installation
Flow line
Drive sleeve
Drive sleeve
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Section 2: Installation
2.4
Actuator Assembly on the Valve
2.4.1
Types of Assembly
For coupling to the valve, the housing is provided with a flange with threaded holes
according to Biffi standard tables (SCN6200; SCN6200-1; SCN6201; SCN6201-1).
The number, dimensions and diameter of the holes are made in accordance with ISO 5211,
but for actuator models 0.3 to 6 the holes are drilled on the centreline in order to allow an
easier assembly of an intermediate flange, when required. This intermediate flange
(or spool-piece) can be supplied when the valve flange can‘t directly match the actuator
flange in its “standard” configuration. For the biggest actuator models, the actuator
flange can be machined in accordance with the valve flange dimensions. The yoke has
bored with keyways for coupling to the valve stem, the dimensions of which are according
to Biffi standard tables SCN6200* and SCN6201*. 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. 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 9
Insert Bush + Intermediate Coupling Flange
Housing
Insert bush
Snap ring
Adaptor flange
Standard position 1
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Insert bush
Position 2
Position 3
Position 4
