Gas springs can be defined as hydro-pneumatic, energy storage elements. Nitrogen gas and oil are utilized for providing compressible and damping (motion control) mediums. Gas springs can be configured to meet a wide range of requirements.

Gas springs consist of a precision rod attached to a piston, moving within a sealed cylinder containing pressurized nitrogen gas and oil. Their force (F) is equal to the pressure differential (P) between internal and external (environment) pressures, acting on the cross-sectional area of the rod (A).

While for most applications ∆P (pressure differential) can be approximated by the spring’s internal pressure (P), ∆P must be taken in consideration for gas springs used in high pressure environments (e.g. Sub-sea applications).