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STI S.r.l.
– Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018
– RTQHS
9
5.6
Installation
Warning
It is assumed that the installation, setting, commissioning, maintenance and repair
works are carried out by qualified personnel and checked by responsible
Specialists.
Any repair work other than the operations outlines in this Instruction Manual will
be strictly reserved to qualified STI srl personnel or to personnel directly
authorised by the Company itself.
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 RTQHS actuator is purchased separately, proceed as follows before assembling it onto the valve:
-
Check that the coupling dimensions of the actuator/coupling block flange and stem meet the specified
coupling dimensions.
-
Prepare the necessary tools for the assembly and setting of the unit.
-
Check that the outer surface of the actuator is free from dust and dirt.
-
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.
