Modern hydraulic door closers (referred to as door closers) began with a patent registered by Americans in the early twentieth century. Unlike traditional door closers, they are buffered by throttling the liquid in the door closer. . The core of the hydraulic door closer design idea is to realize the control of the closing process, so that the various functional indicators of the closing process can be adjusted according to the needs of the person. The significance of the door closer is not only the automatic closing of the door, but also the protection of the door frame and the door body (smooth closing). More importantly, the door closer has become an indispensable part of the intelligent management of modern buildings.
Door closers are mainly used in commercial and public buildings, but they are also used at home. They have many uses, the most important of which is to close the door itself to limit the spread of fire and ventilation in the building.
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