4.3.1.
Overview on coupling variants
Design
Figure 8: Valve attachment via coupling
[1]
Bore with keyway
[2]
Square bore
[3]
Two-flat
Application
●
For valves with connections according to MSS SP 101 [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 tag:
-
CW
≙
end position CLOSED (for clockwise rotating valve)
-
CCW
≙
end position OPEN (for clockwise rotating valve)
Assembly steps
1.
Thoroughly clean and degrease the surfaces of output mounting flanges.
2.
Apply a small quantity of grease to the valve shaft [2].
14
FQMEx 05.1 – FQMEx 12.1
Assembly
FM version (Class/Division System)
