Damped Gas Springs or "Dampers"
Partially Damped springs
As a standard IGS gas spring extends in a rod down condition, a damping effect is created firstly by nitorgen gas then oil being forced through orificing within the piston. Since oil is considerably more viscous than nitrogen, maximum damping occurs as the piston reaches the oil near the point of full extension. IGS can modify the damping and the transition point from low damping to high damping within the spring by increasing the amount of oil, increasing the oil viscosity or reducing the size of the orifice.
Fully Damped springs
These springs incorporate a separator piston. As the name suggests this piston separates the oil from the gas within the spring. There is oil permanently from the front of the spring (where the rod enters the body) to the separator piston. As a result the spring can be used in any orientation, not just rod down.
Additionally the piston attached to the rod moves permanently in oil such that it is possible to vary the damping in either extension or compression.
The greater the tube size is in relation to the rod the greater the amount of oil to pass through the piston.
The greater the ratio tube size / rod diameter the greater the damping effect.
Extension and compression times are calculated in-house using our CAD system.