4
47-602 F10 and F50 Flow Switches
1.0 Introduction
F10 vane-actuated flow switches provide excellent reliabili-
ty for a broad spectrum of horizontal pipe flow-sensing
applications, including air, oil and petroleum derivatives,
corrosive chemicals, and water.
F50 Flow Switches are utilized, in horizontal lines, to sense
the presence or absence of liquid flow in oil, chemical, gas,
and water lines.
1.1 Principle of Operation
The flow of liquid or gas through a pipeline applies a force
to a flow vane inserted into the pipeline. When flow is
sufficient such that the force on the vane moves the vane,
it is pivoted up, parallel to the flow. This movement causes
an attraction sleeve to move into the field a magnet. The
magnet moves toward the sleeve causing actuation of
the switch.
The flow of liquid through the valve body applies a force
to a flow disc. This in turn raises the magnetic sleeve,
within its sealed non-magnetic enclosing tube into the
field of the switch magnet, located outside the enclosing
tube, actuating the attached switch mechanism.
1.2 Operating Cycle
Sufficient flow through a pipeline causes the pivoted vane
assembly to swing in the direction of the flow. The vane
assembly rotates a cam which lifts an attraction sleeve,
which in turn causes the magnet to pull in and actuate
the switch.
The O-ring sealed adjusting screw, in the top of the
enclosing tube, compresses the range spring located above
the attraction sleeve. Turning the adjusting screw clock-
wise, increases the flow rate at which the switch actuates.
Adjustments can be made while the flow switch is in service.
Actuating
vane
Adjusting
screw
Magnetic
sleeve
Swing out
position
Return
spring
Pivot
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