How does a gas strut work?

A gas strut or gas spring is a sealed energy source containing an inert gas (nitrogen) and oil. Being self-contained units these useful devices require no power source or maintenance.

Nitrogen is forced under pressure into the cylinder of the unit. The internal pressure exceeds atmospheric pressure and generates an outward force on the rod, making the rod of the unit extend.

With the pressure being equal on both sides of the piston, there is more force acting in direction ‘B’ than in direction ‘A’. This forces the rod of the gas spring out.

When the rod is compressed into the cylinder, the internal pressure and the output force increase according to the volume displaced by the rod. On extension or compression, gas is metered from one side of the piston to the other via a small orifice.

At the end of the extension stroke, oil damping occurs within the gas spring due to a hydraulically cushioned zone.

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