A commercial door closer has two or three adjustment valves. Small turns make a big difference.
Step-by-step guide
- Check for leaking oil Oil on the closer body or the door means the seals have failed and the closer needs replacing, not adjusting.
- Find the valves Look for small screws on the end or underside of the closer, often marked S for sweep and L for latch.
- Adjust the sweep speed Turn the sweep valve an eighth of a turn at a time. Clockwise slows the door.
- Adjust the latch speed The latch valve controls the last few inches. Set it so the door latches firmly without banging.
- Never unscrew a valve fully Backing a valve all the way out releases the oil and ruins the closer.
When to call a locksmith
If the steps above do not solve it, or you would rather not do it yourself, see Door Closer Repair & Installation or browse more how-to guides.
Rather have it done for you? Mobile Locksmith DC is open 24/7 with a 15–25 minute response anywhere in Washington, DC. Call (240) 202-2249.