| Application(s) or example(s)
that save peak hydraulic horsepower energy levels and reduce capital
costs for pumping systems, whilst increasing control precision.
In applications as discussed (see:
PistoLite)
the addition of one
IndAcc
to the system enables pump cascade control. Pump cascade control
is the use of multiple inexpensive fixed displacement fixed rpm
low cost unsophisticated highly reliable pumps to produce infinitely
variable flow rate when HydroTrole
IndAcc
accumulators are used. When the demand from the system is at a higher
rate then can be produced by one pump the
IndAcc
will begin to discharge before the
PistoLite
discharges; this is because the anular area around the
IndAcc
tail rod is less than the area of the gas side of the piston. therefore
when the gas side of the
IndAcc
and the gas sides of the
PistoLite
accumulators are interconnected and the hydraulic oil side of the
PistoLite
accumulators and the hydraulic oil side of the
IndAcc
are interconnected the differential area of the
IndAcc
ensures that it begins to discharge first. Immediately the
IndAcc
begins to discharge, its tail rod trips on another pump by closing
its unloading valve. Additional pumps will be brought online sequentially
in the same way if system demand is still exceeding rate of supply.
Conversely when more pumps then are necessary
for rate of supply are running the accumulators will refill and
as they do the
IndAcc
will retract putting more pumps into a no pressure, recirculation
mode. These
IndAcc
plus
PistoLite
packages systems known as acc-packs do not give stepped rates of
flow because the accumulator behavior provides smooth transition
between any numbers of pumps running at one time. An
IndAcc
provides pump cascade control ensuring infinitely variable flow
rate and minimum horsepower usage.
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