Installation, Operation and Maintenance Manual
MAN 575 Rev. 4
July 2020
7
Installation
Section 2: Installation
Figure 4
1= Points of support
2 = Don't lay the actuator on the tie rods
!
WARNING
Don’t lay the actuator on accessories (manual handpump, manual jackscrew,
pneumatic control system, etc.).
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 (TN1182 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
