Installation, Operation and Maintenance Manual
MAN 573 Rev. 8
July 2020
!
WARNING
Don't lay the actuator on accessories (manual handpump, manual jackscrew, pneumatic control
system etc.).
Figure 7
1 = Points of support
2 = Do not lay the actuator on tie-rods
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 (TN1182N attached). The number, dimensions and diameter of the holes are made
in accordance with ISO 5211. The actuator is provided with a spool piece and a stem extension for
coupling to the valve. The assembly position of the actuator, with reference to the valve, must comply
with the plant requirements (cylinder axis parallel or perpendicular to the pipeline axis).
NOTICE
To fix the actuator to the valve flange must be used the stud bolts and nuts supplied by Biffi.
In case the actuator is supplied without stud bolts and nuts, the following materials must be
used as a minimum:
•
ASTM A 193 Grade L7 for Stud Bolts
•
ASTM A 194 Grade 4 for Nuts
Installation
9
Section 2: Installation
