An automatic door closer is a compact mechanical or hydraulic device mounted at the top of a door that ensures it closes smoothly, securely, and without manual intervention. Here’s a detailed breakdown:
Speed Control (Hydraulic/Pneumatic Damping)
Hydraulic fluid or air passes through internal valves to slow the door’s return, preventing slamming. Adjusting these valves changes the sweep and latch speeds.
Closing Sequence
As the door swings shut, oil (or air) is forced through narrowing passages:
Back‑check slows the initial swing to a stop
Sweep speed controls the mid‑swing velocity.
Latch zone engages the final inches for a quiet, secure close .
