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Natural refrigerants
Natural refrigerants have no, or an insignificant, effect on the ozone layer and greenhouse effect.
Night setback
A night setback system is used to control a heating system.
Nitrile rubber
Nitrile rubber may operate up to about 100 °C. Grundfos uses it in its shaft seals as it has a high resistance to oil and fuel.
Nodular iron
The round shape of nodular graphite reduces the stress concentration and consequently, the material is much more ductile than grey iron.
Non-return valve
A non-return valve allows a medium to flow in only one direction.
NPSH (Net Positive Suction Head)
The difference between inlet pressure and the lowest pressure level inside the pump is called NPSH: Net Positive Suction Head.
NPSH Curve
NPSH (Net Positive Suction Head) is an expression for the suction capability of the pump.