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- The impeller spins & throws water out
Like swinging a bucket of water above your head and staying dry or throwing clay on a potter's wheel and wearing it.
- Low pressure is formed in the pump inlet
The lower the pressure, the higher the pump can "suck"
- Atmospheric pressure pushes more water in.
It is this simple - this is the major part of pump theory !
Understand this, and NPSH is easy!
pumps don't suck
in fact, nothing does.
Many things in our world work in the same way, by creating a low pressure area and allowing higher pressure air to apply force to water, air, or an object. This force explains the workings of :
wind
breathing
flight
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all types of pumps
vacuum cleaners
car spoilers
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carburettors
venturies
etc, etc
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