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32 Installation - Speed Sensors
BYPASS SYSTEMS
In a Bypass System the Flowmeter measures
all the flow to the booms, but the Servo Valve
controls the flow bypassed back to the Tank (or
pump inlet).
This type of system is only used for low flow
rates.
This configuration is shown below.
THE FLOWMETER MUST ONLY MEASURE
THE FLOW TO THE BOOMS. THEREFORE, IT
MUST BE AFTER ANY RETURN LINES.
THE FLOWMETER MUST MEASURE THE
FLOW TO THE ENTIRE BOOM. THEREFORE,
IT MUST BE BEFORE THE BOOM CONTROL
VALVES.
It is highly recommended to install the flowmeter
after the filter, as shown below.
TANK
FLOWMETER
PUMP
VALVE
OR
MANUAL
HM860
BOOM VALVES
NOTE: SERVO VALVE CAN ALSO BE
INSTALLED TO RETURN THE
MATERIAL TO TANK INSTEAD
OF PUMP INLET.
FILTER
SERVO
VALVE
MANUAL
VALVE
OPTIONAL AGITATION LINES
TO BOOMS
DWG. NO. 2732
If the Servo Valve is mounted in an existing by-
pass line or agitation line, be sure to remove
any parts that may restrict the flow. For exam-
ple, some agitation lines have nozzles inside the
tank; this would severely limit the range of the
Servo Valve and must not be used. If a new by-
pass line is going to be installed, keep it as big
as possible.
A minimum of 1-inch diameter hose should be
used. Try to mount it so the total length is as
short as possible.
A manual valve MUST be located after the pump
and before the bypass line as shown. This valve
is required to make overall sprayer pressure ad-
justments.
Additional bypass lines for agitation are optional.
If used, they must include a manual valve for ini-
tial pressure adjustments. Low capacity pumps
may require closing these valves.