Hydraulics Glossary: N

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Hydraulic Engineering Glossary of Terms and Terminology

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A glossary of the key hydraulic engineering terms and related terminology you may encounter when working with hydraulic systems. Introducing the letter 'N'…

NEEDLE VALVE:
A two-way valve that may be opened or closed to block or adjust the flow of hydraulic fluid between, and including, fully on and fully off. The needle valve consists of a sharp conical obstruction that is extended or retracted to block or allow flow. Normally designed so that the flow of fluid must make an non-straight turn inside the valve body which results in a desired loss of pressure across the valve when open which is greater than the loss across a gate valve.
NEWTON:
A unit of force based on the unit of mass, Kg (kilogram), multiplied by the acceleration, m/s2 (meters per second per second) which produces Kgm/s2, called the Newton. 1 N = 1 Kgm/s2 = 0.1225 lbs. (F) — (pounds force).
NEWTONIAN FLUID:
Fluid whose viscosity does not change with rate of flow.
NIPPLE:
The internal member or portion of a hose fitting.
NITROGEN:
An inert gas used to serve as an energy source for accumulators or to be used as a cleaning agent when pure, nonexplosive gases are required.
A fluid in which shear stress is not proportional to shear rate.
A hydraulic fluid that contains no petroleum. Non-petroleum based oils are ideal for hydraulic systems that are used near a fire hazard.

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