Neptune TRU/FLO, Installation And Maintenance Manual

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TRU/FLO Compound Meter Installation and Maintenance Guide 41
Glossary
AWWA American Water Works Association.
calibration vane assembly Allows field calibration of the UME to lengthen service life and
to ensure accurate registration.
crossover range Meter transitions from low flow to high flow.
disc measuring assembly Registers low flows.
gasket Shaped piece or ring of rubber or other material sealing the
junction between two surfaces.
hydraulic valve assembly Transfers flow smoothly between the disc section and turbine
section of the meter, minimizing the loss of accuracy in the
crossover range.
magnet drive assembly Two magnetic-driven, roll-sealed registers simplify the meter’s
design and reduce long-term maintenance by eliminating
complicated combined drive mechanisms.
main valve assembly Spring-loaded assembly used to divert low flow rates through
the T-10 measuring chamber. Primarily composed of a
stainless steel spring and an 85% copper lead free bronze
housing. As the flow rate increases, the spring in the main
valve assembly is overcome allowing larger flow rates to be
captured by the turbine assembly.
maincase Consists of a durable lead-free, high-copper alloy. It is
corrosion-resistant, lightweight, and easy to handle.
nutating disc meters Meters that have a round disc that is located inside a cylindrical
chamber. The disc nutates, or wobbles, as it passes a known
volume of liquid through the cylindrical chamber. The rotating
motion of the disk is then transmitted to the register that
records the volume of water that went through the meter.
nutation Rocking, swaying, or nodding motion in the axis of rotation of a
largely axially symmetric object.