IMI STI RTC Series, Инструкция по эксплуатации

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STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5100, rev. 06 06/2020 – RTC/RTCS - 9 -
Important To guarantee the correct transmission of torque 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 actuator
and bracket (or flange) [1] and from bracket (or flange) and valve flange [2].
- tighten the bolts fixing the bracket (or flange) to the bottom flange of the
actuator with the torque specified into the following Table 1.
tighten the bolts fixing the bracket (or flange) to the bottom flange of the
actuator with the torque specified into the following Table 2, provided that the
valve maker verifies and guarantees the correct transmission of required valve
torque.
Table 1 Table 2
Actuator
ISO 5211
flange
Bolts
Tightening
torque (Nm)
(1)
Bolts
Tightening
torque (Nm)
(1)
Bolts
Tightening
torque (Nm)
(1)
RTC/S-01 F12 4 x M12 70 M10 40 M36 1.800
RTC/S-02 F14 4 x M16 180 M12 70 M42 3.000
RTC/S-03 F16 4 x M20 340 M16 180
M20 340
M24 550
(1) The torque values in Tables 1 and 2 have been calculated considering the standard bolting made in
Carbon Steel according to ASTM A320 grade L7/ASTM A193 grade B7 for bolts/screws and ASTM
A194 grade 4 for the nuts. Alternative bolting in Stainless Steel are permitted i.e. ASTM A193 B8M
(Class 2 or 2C) for bolts/screws and ASTM A194 grade 8M for the nuts, provided that yield strength of
bolts/screws is not less than 450 MPa.
5.6.3 Pneumatic Connections
Warning: Check that the values of pneumatic supply available are compatible with those
reported on the identification plate of the actuator.
Warning: Use pipes and connections appropriate as for type, material and dimensions.
Warning: 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.
- 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 pneumatic connections. If necessary, tighten the nuts of the pipe-
fittings.