June 2021
Installation, Operation and Maintenance Manual
MAN 689 Rev. 6
Installation
The actuator can be assembled onto the valve flange either by using the actuator-housing
flange with threaded holes, or by the interposition of an adaptor flange or a spool piece.
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 proceed as follows:
1.
Check that the coupling dimensions of the valve flange and stem, or of the
relevant extension, meet the actuator coupling dimensions.
2.
Bring the valve to the position related to the actuator spring operation.
3.
Lubricate the valve stem with oil or grease in order to make the assembly easier.
Be careful not to pour any of it onto the flange.
4.
Clean the valve flange and remove anything that might prevent a perfect
adherence to the actuator flange and especially all traces of grease, since the
torque is transmitted by friction.
5.
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.
6.
Bring the actuator to the position caused by the spring operation.
7.
Connect a sling to the support points of the actuator and lift it: make sure the
sling is suitable for the actuator weight. When possible, it is easier to assemble the
actuator to the valve if the valve stem is in the vertical position. In this case the
actuator must be lifted while keeping the flange in the horizontal position.
8.
Clean the actuator flange and remove anything that might prevent a perfect
adherence to the valve flange and especially all traces of grease.
9.
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 of the valve flange. If they
do not meet with the holes of the actuator flange or the stud bolts screwed into
them, the actuator drive sleeve must be rotated; feed the actuator cylinder with
air at proper pressure, indicated on data sheet for actuator.
10.
Tighten the nuts of the connecting stud bolts evenly with the torque prescribed in
the table. The stud bolts must be made of ASTM A320 L7 steel; the nuts must be
made of ASTM A194 grade 2 steel.
11.
If possible, operate the actuator to check that it moves the valve smoothly.
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Section 2: Installation
