4.2.
Actuators for fail safe units
An AUMA actuator with integral controls combination is required to operate the valve
via fail safe unit. On delivery, the actuator is already mounted to the fail safe unit.
Information
●
Assembly of disassembly of actuators should only be performed by the AUMA
Service.
●
The mounted SQ part-turn actuator is not equipped with end stops. The part-
turn actuator screw plugs do not have any function and should not be opened.
4.3.
Fail safe unit: mount to valve
The fail safe unit is mounted to the valve using a coupling placed onto the valve
shaft.
4.3.1.
Overview on coupling variants
Design
Figure 9: Valve attachment via coupling
[1]
Bore with keyway
[2]
Square bore
[3]
Bore with two-flats
Application
●
For valve attachments according to EN ISO 5211
●
For rotating, non-rising valve stem
4.3.1.1. Fail safe unit to valve: mount
Unbored couplings or couplings with pilot bore must be machined to match the valve
shaft prior to mounting the fail safe unit to the valve (e.g. with bore and keyway,
two-flat or square bore).
Information
●
Assemble valve and fail safe unit in the same end position (OPEN/CLOSED).
●
Only mount fail safe unit with unwound constant force spring. Make sure that
unit is not live.
●
While constant force spring is unwound, the fail safe unit is set to the end posi-
tion of the fail safe direction indicated on the name plate:
-
CW
≙
end position CLOSED (for clockwise rotating valve)
-
CCW
≙
end position OPEN (for clockwise rotating valve)
Assembly steps
1.
Clean and thoroughly degrease mounting surfaces of output mounting flanges.
2.
Apply a small quantity of grease to the valve shaft [2].
13
FQM 05.1 – FQM 12.1 / FQMEx 05.1 – FQMEx 12.1
Assembly
Содержание FQM
Страница 35: ...35...
