Gas springs
Gas springs are used in applications where you want to push, pull, raise, lower or position lids, doors or other components without the help of external force. They are preloaded individually at a certain pressure, depending on the application. During the compression of the stem there is an increase in nitrogen pressure which therefore increases the reaction force.
Gas springs have a practically flat force curve; this feature makes them useful where it is necessary to obtain a thrust proportionate to the weight to be lifted or moved.