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Door closer work
How does a door closer work?
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A door closer is a mechanical device that is commonly used to automatically close a door after it has been opened. It is usually installed at the top of the door and attached to the door frame. The primary function of a door closer is to ensure that the door closes securely and reliably, preventing it from being left open accidentally.
Here’s a general overview of how a typical door closer works:
1. Spring Mechanism: Most door closers use a spring mechanism that stores energy when the door is opened and releases it to close the door. The spring is typically contained within a cylindrical housing.
2. Hydraulic Fluid or Pneumatic Cylinder: Door closers may use either hydraulic fluid or a pneumatic cylinder to control the motion of the door. In the case of a hydraulic door closer, it contains a small hydraulic pump and a piston that moves back and forth. When the door is opened, the piston is drawn back, compressing the hydraulic fluid. When the door is released, the compressed fluid pushes the piston forward, assisting in closing the door. Pneumatic door closers work similarly but use compressed air instead of hydraulic fluid.
3. Adjustment Valves: Door closers often have adjustment valves that allow the user to control the closing speed and latching speed of the door. These valves regulate the flow of fluid or air and can be adjusted to achieve the desired closing speed.
4. Arm and Mounting: The door closer is attached to both the door and the door frame. It typically consists of an arm that is connected to the door and a bracket that is mounted to the frame. The arm is designed to swing as the door opens and closes, and it transmits the force generated by the door closer to control the door’s movement.
5. Closing and Latching: As the door is opened, the spring or the hydraulic/pneumatic mechanism is tensioned or pressurized, respectively, storing energy. When the door is released, the stored energy is released, causing the door closer to pull the door back towards the closed position. The closing speed is regulated by the adjustment valves mentioned earlier. As the door approaches the closed position, a latching mechanism within the door closer engages, holding the door securely closed.
It’s worth noting that there are different types and models of door closers available, and their specific designs and features may vary. Some high-end door closers may incorporate additional features such as delayed closing or hold-open functions for increased convenience and accessibility.