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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 Curve
NPSH (Net Positive Suction Head) is an expression for the suction capability of the pump.
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.