The wide use of buffer door closers includes: anti-theft, fire prevention, wind protection, positioning, energy saving, convenience, mute, etc., and the commonly used door closers in recent years are buffer door closers. The RDC-07 hydraulic buffer door closer produced by Lelang Hardware can bear the door weight of 35-60KG. After installing this door closer, the door is closed and silent, which can ensure that the door can be accurately and timely closed to the initial position after opening. The installation is convenient and Practical.