How to Adjust Door Closer: Step-by-Step Guide
Important Safety Notice Before Adjusting
For EN1154 certified door closers and fire-rated door closers, adjustments must follow the correct installation instructions and local fire safety regulations.
Fire door closers are important safety components designed to ensure doors automatically close during a fire emergency.
Do not:
1: Disable the self-closing function
2: Reduce closing force below the required level
3: Modify internal hydraulic components
4: Incorrect adjustment may affect fire door performance and compliance.
Identify Door Closer Adjustment Screws
Most commercial door closers have several adjustment valves.
1. Sweep Speed Valve (1st Speed)
The sweep speed controls the main closing movement.
Usually:
From approximately 180° open position
Until the final closing area
Adjustment:
Clockwise → slower closing
Counterclockwise → faster closing
2. Latch Speed Valve (2nd Speed)
The latch speed controls the final closing stage.
It controls:
1: Door closing during the last few degrees
2: Lock engagement
3: Door sealing pressure
Adjustment:
Increase latch speed if the door cannot close completely
Reduce latch speed if the door slams at the end
3. Back Check Adjustment (Optional)
Back check controls resistance when opening the door.
It helps prevent:
Door hitting walls
Excessive opening force
Hardware damage
Common applications:
Hospitals
Schools
Commercial buildings
High traffic entrances
4. Hold Open Adjustment (Optional)
Some door closers include a hold-open function.
Hold-open models allow doors to remain open temporarily.
Applications:
Office buildings
Hospitals
Public facilities
The hold-open force should be adjusted according to the actual usage environment.
Step-by-Step: How to Adjust a Door Closer
Step 1: Prepare Tools
Before adjustment, prepare:
Allen wrench / hex key
Screwdriver (depending on closer model)
Product installation manual
Always make small adjustments.
A small valve rotation can significantly change closing performance.
Step 2: Adjust the First Speed (Sweep Speed)
Test the door closing movement.
If the door closes too fast:
→ Turn the sweep speed valve clockwise slightly.
If the door closes too slowly:
→ Turn counterclockwise slightly.
Adjust gradually until the door closes smoothly.
Step 3: Adjust the Second Speed (Latch Speed)
After setting the main closing speed:
Adjust the final closing stage.
If:
Door slams before closing
Reduce latch speed.
Door cannot close completely
Increase latch speed slightly.
Step 4: Adjust Hold-Open Function
For hold-open door closers:
Check:
Whether the door stays at the required opening angle
Whether the holding force is appropriate
Whether the door can release smoothly
For fire-rated applications, make sure hold-open functions comply with local regulations.
Common Door Closer Problems and Solutions
Problem 1: Door closes too fast and hits the frame
Possible causes:
Sweep speed too fast
Latch speed too high
Solution:
Adjust sweep speed and latch speed gradually.
Problem 2: Door does not close completely
Possible causes:
Latch speed too slow
Incorrect closer size
Door alignment issue
Excessive sealing resistance
Solution:
Check closer adjustment first, then inspect door installation conditions.
Problem 3: Hold-open door cannot stay open
Possible causes:
Hold-open force adjustment incorrect
Mechanical holding function problem
Solution:
Adjust the hold-open setting or check the closer model.
Problem 4: Door is difficult to open
Symptoms:
Elderly people cannot open the door easily
Children have difficulty pushing the door
Possible causes:
Closing force is too high
Back check resistance is excessive
Wrong closer size selected
Solution:
Check the required opening force according to the application.
For public buildings and accessibility applications, the correct door closer selection is essential.
Fire Door Closer Adjustment Warning
Fire-rated door closers must always comply with:
Local fire regulations
Building codes
Certified product requirements
If a fire door closer is damaged, leaking oil, or cannot close properly, replacement with a compliant fire-rated model may be required.
Choose Reliable Certified Door Closers from Dorrenhaus
Dorrenhaus provides professional door closer solutions for commercial and fire door applications.
Our products include:
CE certified door closers
UL listed door closers
EN1154 door closers
ANSI Grade 1 commercial door closers
With advanced manufacturing capability and strict quality control, Dorrenhaus supports global customers with reliable door hardware solutions.
If you need reliable CE, UL, EN1154 / ANSI Grade 1 door closers for commercial and fire doors, contact Dorrenhaus today.