2. MACHINE DESCRIPTION
2.1 General
The F02 is an electric quarter-turn actuator suitable to operate a valve in a 90° manoeuvre.
The actuator introduces innovative solutions to provide maximum flexibility in terms of
voltage supply, operation speed and torque options.
2.2 Principle of operation
The electric motor drives the input to an epicyclical gear train via a spur reduction. The input
member of the epicyclical gear train carries a single compound planet gear which meshes
with two internally toothed gears, one being the fixed annulus and the other being the output
gear. The fixed annulus gear has external helical teeth meshing with a transversely fixed
worm gear. Since the annulus cannot drive the worm gear this provides a fixing point for the
annulus, and since the worm gear can drive the annulus, a means of manual operation is
provided which needs no declutch.
An end-of-travel-position detection device is operated via a position sensor directly linked to
the output shaft. The valve position is continuously monitored in electric mode by means of
a position sensor directly connected to the F02 output drive.
2.3 Electrical operation
- Control command “open”: counter-clockwise or clockwise rotation (selectable on the local
panel) moves the valve to a completely or partially open position;
- Control command “closed”: clockwise or counter-clockwise rotation (selectable on the
local panel) moves the valve to a completely or partially closed position;
Control system details are shown in the specific wiring diagram.
2.4 Manual operation
To be used in case of power supply failure or during actuator setting.
The manual operating device is completely independent of the motor drive and can be
operated at any time, whether or not the motor is running, without danger to the operator.
The handwheel does not rotate during power operation.
To close the valve turn the handwheel clockwise.
To open the valve, turn the handwheel counter-clockwise.
Important: Handwheel rotation
In standard applications clockwise rotation of the handwheel
moves the valve to close position and counter-clockwise
rotation moves the valve to open position.
Different operation must be clearly indicated on the
handwheel.
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© Copyright by BIFFI Italia. All rights reserved.
A !@#$ INTERNATIONAL LTD. COMPANY
F02 Quarter-turn Electric Actuators
instruction and operating manual
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