STI SC Series User Manual

STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5020, rev.03 07/2021 - SC/VHS 9
Important
To guarantee the correct transmission of thrust from the actuator to
valve stem without phenomena of slip it is important to remove any
trace of oil and/or grease from the mating surfaces of valve and
actuator or bracket and tighten the nuts fixing the bolts with the
torque specified into the following Table 1
Table 1
Threading
Tightening torque (Nm)
Threading
Tightening torque (Nm)
M8
20
M24
550
M10
40
M27
800
M12
70
M30
1200
M14
110
M33
1400
M16
150
M36
1800
M20
300
The torque values in Table 1 have been calculated considering the materials ASTM A320 grade L7
or ASTM A193 grade B7 for screws or tie rods and ASTM A194 grade 4 for the nuts.
Alternative bolting permitted i.e. ASTM A193 B8M (or B8M3) for tie rods and ASTM A194 Gr.8M for
the nuts, provided that yield strength of screws or tie rods is over than 450 Mpa.
5.6.3 Hydraulic Connections
Warning
Check that the values of hydraulic supply available are compatible with those
reported on the identification label of the actuator.
Use pipes and connections appropriate as for type, rating, material and
dimensions.
The connection should be made by qualified staff.
- Properly deburr the ends of rigid pipes.
- Properly clean the interior of pipes sending through them plenty of the supply fluid used in the
system.
- Carry out the flushing operation before assembling the pipes.
- Mould and fasten the connection pipes so that no irregular strains at entries or loosening of
threaded connections occur.
- Make the connections according to the operating diagram.
- Check the absence of leakages from hydraulic connections. If necessary tighten the nuts of the
pipe-fittings.

STI SC Series Specifications

General

Brand	STI
Model	SC Series
Category	Controller
Language	English