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The secret behind the award-winning N-technique is the combination of a swept-back leading edge and a relief groove in the volute.
Nothing to get hooked on
The leading edge on most impellers is axial. This is the ideal shape for rags and other long stringy material to wrap themselves around. To avoid this problem, we flattened and swept back the leading edges of the impeller.
Relief groove
To help really stubborn material pass through the impeller, we developed a "relief groove". As the impeller turns, rags are forced into this spiral-shaped groove. The combined action helps to tug material from the impeller into the volute where it is free to be pumped away.
Cuts energy costs by up to 50 percent
Large savings can be made when pumping contaminated water. This is because N-pumps give you high efficiency, day after day, week after week - we call it sustained efficiency.
Eliminates build-up and efficiency loss
The problem with conventional impellers is the gradual build-up of stringy material. Over time, the passage in the impeller narrows, reducing the amount of water it can pump. So, as the impeller gradually clogs up, efficiency drops. As you can see in the table below, the
N-technique sustains efficiency at its original rated level month after month.
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A) Clogging of conventional pumps: Energy consumption increases as efficiency decreases.
B) Backflushing achieves temporary efficiency gains as well as spikes in energy consumption.
C) Virtually clog-free N-pump: Consistent efficiency and energy savings.
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Stage 1: The N-impeller blades with backswept
leading edges sweep solids from the center to
the perimeter of the inlet.
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Stage 2: The relief groove and guide pin
in the volute push solids, such as rags,
away from the impeller.
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