Installation, Operation and Maintenance Manual
MAN 604-1A Rev. 6
March 2021
Installation
5
Section 2: Installation
2.3
Assembling the Actuator onto the Valve
2.3.1
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 cannot 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*.
