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NPSH (Net Positive Suction Head)

The difference between inlet pressure and the lowest pressure level inside the pump is called NPSH: Net Positive Suction...

NPSH Curve

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

Natural refrigerants

Natural refrigerants have no, or an insignificant, effect on the ozone layer and greenhouse effect. They are widely used in...

Night setback

A night setback system is used to control a heating system. A night setback system will lower the room temperature at night,...

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...

Nodular iron

The round shape of nodular graphite reduces the stress concentration and consequently, the material is much more ductile than...

Non-return valve

A non-return valve allows a medium to flow in only one direction. A non-return valve is fitted to ensure that a medium flows...

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