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Free type gas spring is also called knighthead, it's main purpose is to support. It has two positions: Longest when free and shortest when pressed by force. It has the features of light, stable, easy to operate and low price thus widely used in auto, engineering machinery, printing machinery, furnature and textile machinery.
Self-lock type gas spring
It is the one can be locked in any position during stroke. There's a needle valve at the end of the position, if switch this needle valve it can go like free type while lock the moment position when unlock the needle valve. It's widely used in mdeical equipment, hair-dressing chair, furnature, aviation and saloon car.
Air pressing bar
It has the inert gas to make the working stroke remain invariablenees and also has the unique feature of mild cushion to avoid impact at the end position. It's mainly used in chair, bar chair and bar table etc.