11
Installation, Operation and Maintenance Manual
VCIOM-15792-EN Rev. 0
October 2020
Section 2: Installation
Installation
1.
Check that the coupling dimensions of the valve flange and stem, or of the
relevant extension, meet the actuator coupling dimensions (valve stem and flange).
Lubricate the valve stem with grease in order to make the assembly easier.
2.
To make easier the assembly, the valve stem has to be in perfect vertical position.
3.
Disassemble the two halves of actuator pedestal shell joint (item 8) by unscrewing
the retaining screws (item 4), therefore disassemble the valve stem joint (item 7).
4.
Lift the actuator by utilizing the proper lifting eyelets, and unscrew the nuts and the
stud bolts from the actuator pedestal.
5.
Assemble the actuator onto the valve, and arrange it in its correct vertical position
proper to connection between valve stem and actuator cylinder rod.
6.
Screw the valve stem joint (item 7) on valve stem up to reach the proper position
which allow the reassembly of the two halves of shell joint (item 8), tighten the
joint fastening screws (item 4).
7.
Screw the stud bolts (item 1) into the actuator pedestal flange, and screw the nuts
on the stud bolts.
8.
Tighten according to the nut (item 2) size torque requirements.
To operate refer to following Table:
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
M14
110
M16
160
M20
320
M22
420
M24
550
M27
800
M30
1100
M33
1400
M36
1700
