Tunstall Macon STV Series Manual page 148

INSTALLATION & OPERATING INSTRUCTIONS
AUTOMATIC BALANCING VALVES
INSTALLATION
There are no minimum straight-piping requirements
for the inlet or the outlet.
Valves may be installed in horizontal or vertical lines.
The flow arrow on the valve body must be pointed in
the direction of flow.
Avoid placing the valve close to a pump discharge.
Allow 10' before the valve if possible.
OPERATION
Macon Automatic Balancing Valves incorporate a
removable flow cartridge that is factory set to limit the
GPM to within ± 5% of the specified flow.
The flow can be verified by measuring the differential
pressure (D.P.) across the valve using the PT Ports
provided.
If it measures between 2-32 the flow is with in the
specified flow range.
MANUAL BALANCING VALVES
INSTALLATION
Macon Manual Balancing Valves & Venturi's are
unidirectional, observe flow arrows.
All models can be installed in horizontal or vertical pipe.
STRAIGHT-RUN REQUIREMENTS
The MB models have the necessary straight-run length
built in and can be installed directly downstream of a
90 degree elbow or a control valve. If the control valve
is smaller then the MB, than the reduction can be done
with a Macon tailpiece or reducing coupling to insure
a proper reading.
Models MBF, MBG, VF, VG and VW can be installed
with no additional pipe diameters upstream or down-
stream for line size connections.
Tap Locations (Pressure Taps or PT Ports).
For portable D.P. metering, the taps can be pointing
at any clock location, except at 6 o'clock.
Optional accessories such as air vents should always
point up and drain down.
MAINTENANCE
There is no periodic maintenance required on the
Automatic Balancing Valve.
Using a Y strainer is always recommended to prevent
clogging. A 40 mesh screen is recommended for flow
of 1.5 GPM or less.
The controlled flow rate can be changed in the field
without having to remove the valve from the line.
Isolate the system, relieve pressure and drain water.
Carefully remove the cap and pull out the cartridge
with your fingers. When refitting make sure the O-ring
on the cartridge and cap are in place.
OPERATION
The flow is determined by measuring the differential
pressure (D.P.) across the high (Red) and low (Blue)
taps on the venturi. Convert the measured D.P. to
inches W.C. and use the appropriate Macon chart
to read the flow.
CHART MODELS
FCMB-0413 .50" – 2.00" MB
FC1-0413 2.50" – 6.00" MBF, MBG, VF, VG, VW
FC2-0413 8.00" – 12.00" MBF, MBG, VF, VG, VW
Models MB and MBF are equipped with a downstream
throttling valve to adjust the flow.
Slowly close the valve while reading the D.P. gauge
until the desired flow is reached. Set the memory stop
so the handle position is maintained even if the valve
is temporarily closed.
MAINTENANCE
There is no periodic maintenance required on
these devices.
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148
Tunstall Corporation
118 Exchange Street
Chicopee, MA 01013
Form # IOM-03.14