Installation, Operation and Maintenance Manual
MAN 573 Rev. 8
July 2020
2.4.2
Assembly procedure
NOTICE
Failure to comply with the following procedures may impair product warranty.
For actuator assembly on the valve:
NOTICE
Check that the assembly position, as shown on the documentation, complies with system’s geom
-
etry. Check the consistency of the parts of actuator-valve coupling.
•
Operate the actuator so that it reaches the matching valve position (Section 3.3).
•
Lubricate valve stem with oil or grease.
•
Properly clean and remove grease from valve coupling flange surfaces.
•
Connect, if supplied separately, the stem extension onto the valve stem and fasten it with
the special fastening pins.
•
Lift the actuator using the special lifting points (Section 2.2).
•
Install the actuator so that valve stem inserts in the coupling area. This coupling should be
made without forcing.
•
Fasten the two parts with the threaded connections (screws, tie rods, nuts). If holes of
coupling flanges are not aligned, adequately operate the actuator if necessary, move the
mechanical stops backwards (Section 3.4).
•
Fasten threaded connections. Please refer to Table 4.
!
WARNING
Installation, commissioning and maintenance and repair works should be carried out by qualified staff.
A non-conforming assembly could be the source of serious accidents.
Table 4.
Nuts tightening torque
Threading
Tightening torque (Nm)
M8
20
M10
40
M12
70
M16
160
The screwing values in Table 4 were calculated considering the materials ASTM A320 L7 for screws or
tie rods and ASTM A194 gr.2H for the nuts.
Installation
11
Section 2: Installation
