Serial number fail safe
unit
Table 2:
Description of serial number (example of 0518WQ12345)
WQ12345
18
05
Assembly in week; 05 = week 5
05
Year of production; 18 = 2018
18
Internal number for unambiguous product identification
WQ12345
FQM fail safe direction
Direction of rotation of FQM output drive shaft or the driven valve shaft when safety
function is triggered.
●
CW = Clockwise rotation
●
CCW = Counterclockwise rotation
Fail safe OPEN and fail safe CLOSE safety functions result from the overall
combination of actuator (gearbox), FQM and valve.
Table 3:
Safety function
Safety function
FQM fail safe direction
Valve closing direction (actuator)
1)
Fail safe CLOSE
Clockwise
CW
Clockwise closing
Fail safe OPEN
Counterclockwise
CCW
Clockwise closing
Fail safe OPEN
Clockwise
CW
Counterclockwise closing
Fail safe CLOSE
Counterclockwise
CCW
Counterclockwise closing
For identical closing direction of valve and actuator
1)
2.2.
Short description
In emergencies, the fail safe unit is capable of closing or opening the valve
autonomously relying on mechanical functions. No electrical power is required for
such a fail safe operation. The torque required for opening or closing the valve is
generated by a constant force spring motor, providing a constant torque across the
total travel during fail safe operation. Consequently, the torque value for a fail safe
operation is determined by the available torque of the fail safe unit and is independent
of the actuator torque range.
For standard valve operation, the FQM fail safe unit is combined with an AUMA SQ
part-turn actuator. The required torque is transmitted directly from the actuator through
the fail safe unit to the valve. During standard operation, the constant force spring
motor of the fail safe unit is disengaged and is not operated.
The operating speed for the fail safe operation can be set in the factory. Furthermore,
the actuator operates the valve into the defined end position at reduced speed. This
avoids pressure peaks within the pipeline and protects the valve.
9
FQMEx 05.1 – FQMEx 12.1
FM version (Class/Division System)
Identification
