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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
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5.6 Installation
Warning: Before proceeding with any Installation the following instructions must be
respected:
- Always wear protective clothing, gloves, and eyewear to prevent personal
injury.
- Use the lifting point foreseen on the actuator to move the actuator: if
different instructions are not well specified the lifting points foreseen on
the actuator must be used only to move the actuator.
- Check with your process or safety engineer for any additional measures
that must be taken to protect against process media.
5.6.1
Checks to be performed before installation
If the RTC actuator is purchased separately, proceed as follows before assembling it onto the valve:
1) Check that the coupling dimensions of the actuator/coupling block flange and stem meet the
specified coupling dimensions.
2) Prepare the necessary tools for the assembly and setting of the unit.
3) Check that the outer surface of the actuator is free from dust and dirt.
4) Clean the actuator flange and remove anything that might prevent a perfect adherence to the
actuator/coupling block flange and joint especially all traces of grease.
5.6.2
Assembling of the actuator on the valve
The actuator can be assembled on top of the valve flange either by using the actuator-housing flange
with threaded holes, or by the interposition of a proper mounting hardware.
The actuator drive sleeve is generally connected to the valve stem by an insert bush or a stem
extension. The assembly position of the actuator, with reference to the valve, must comply with the
plant requirements (cylinder axis parallel or perpendicular to the pipeline axis).
To assemble the actuator onto the valve proceeds as follows:
Move the valve and the actuator to their fails position
If an insert bush or stem extension for the
connection to the valve is supplied separately,
assemble it onto the valve stem and fasten it by
tightening the proper stop dowels.
Connect a sling to the support points of the actuator
and lift it: make sure the sling is suitable for the
actuator weight
Lower the actuator onto the valve in such a way that
the insert bush, assembled on the valve stem, enters
the actuator drive sleeve. This coupling must take
place without forcing and only with the weight of the
actuator.
When the insert bush has entered the actuator drive
sleeve, check the holes / pin of the valve flange
meet the actuator holes and pin, otherwise rotate the
mounting bracket to obtain a right assembling.
Fig. 3 – Assembling of the actuator on the valve
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Brachet
