Installation, Operation and Maintenance Manual
MAN 575 Rev. 4
July 2020
9
Installation
Section 2: Installation
2.4.2
Assembly Procedure
NOTICE
Failure to comply with the following procedures may impair product warranty.
!
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.
For actuator assembly on the valve:
NOTICE
Check that the assembly position, as shown on the documentation, complies with system’s
geometry. Check the consistency of the parts of actuator-valve coupling.
•
Operate the actuator so that it reaches the matching valve position, see 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, see 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, see Section 3.4.
•
Fasten threaded connections. Please refer to Table 3.
The screwing values in Table 3 were calculated considering the materials ASTM A320 L7 for
screws or tie rods and ASTM A194 gr.2H for the nuts.
Table 3.
Nuts Tightening Torque
Threading
Tightening torque (Nm)
M8
20
M10
40
M12
70
M16
160
