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The basic building block of hydraulic door closers have bearing direction, drive gear and reset spring plunger, throttle valve, check valve, and rack core and shell, the end cover, seals, and connecting rod. Shell and connecting rod with fixed door closers and connecting doors and door frames.

Door closers working principle is: when to open the door, door drive the connecting rod body movements, and to rotate the drive gear, drive rack piston moves to the right. In the process of piston moves to the right spring is compressed, right cavity of the hydraulic oil pressure also. Plunger on the left side of the check valve in oil pressure under the action of open sphere, the right chamber of the oil in the hydraulic check valve flow into the left cavity. Opened the door when the process is completed, because the spring is compressed in the process of opening, the treasures of the elastic potential energy is released, push the piston to the left, drive gear and door closers connecting rod rotation, to close the door.

In spring release process, because the door closers left cavity of the hydraulic oil is compressed, the check valve is closed, the hydraulic oil only through the gaps between the shell and the plunger, and pass by column inserting holes and 2 with throttle valve core flow back into the right chamber. So the hydraulic oil of the spring release resistance, through the throttling achieved the effect of buffer, to close the door speed under control. The body of the throttle valve can adjust, can control different stroke segment, can change the closing speed. Although different manufacturer production of door closers structure, there are differences in size, but the principle is the same.

Can be divided into: the kinds of door closers mounted and embedded door door closers, embedded in the bottom of the door closers, door door closers (spring), vertical door closers (built-in vertical door closers), and other types of door closers.

Beijing branch into the dragon control system co., LTD is specialized in high-tech product development, production and sales and service of high-tech enterprises, is China's security product industry association, deputy director of the unit, vice President of China association of fire units, China fire protection association director unit, passed the ISO9001 quality management system certification unit, a number of national and local relevant technical specifications and product standard of the ginseng units.

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