When it comes to door closer adjustment, understanding the mechanics can be the difference between a perfectly functioning door and one that slams shut or fails to close entirely.
Many door closers have adjustment screws labeled “S” and “L,” but what do these labels mean, and how do they affect the performance of your door closer?
If you’ve ever wondered about the L and S on door closers and how to fine-tune them for optimal operation, this article is your guide.
By learning about these features, you’ll gain the confidence to adjust your door closer’s sweep and latch speed, ensuring a safer and more functional doorway.
The “S” and “L” valves are adjustment screws on a door closer that control its speed during specific phases of operation.
The valves work by adjusting the hydraulic fluid flow inside the closer.
This design ensures that doors operate smoothly and safely without slamming shut.
Credits: Door Closers USA
This illustration shows two key adjustment valves on a door closer: the Sweep (S) valve and the Latch (L) valve. Each valve allows fine-tuning of the door’s closing speed during specific phases of its motion:
The diagram highlights how these adjustments can be made by rotating the screws, ensuring the door operates smoothly and aligns with safety or user preferences.
These settings are particularly important for doors in commercial settings where both functionality and safety are critical.
Sweep speed refers to the movement of the door from its fully open position to approximately 10–15 degrees before closing. This phase controls the main part of the door’s closing motion, ensuring smooth and quiet operation.
To adjust the door closer sweep speed:
Step 1: Locate the “S” adjustment screw on the closer body.
Step 2: Use a screwdriver to turn the valve: clockwise to slow the speed or counterclockwise to increase it.
Step 3: Test the door after each adjustment until the desired speed is achieved.
Still Have Questions About Door Closers and Valve Adjustments?
Latch speed controls the final stage of the door’s motion, ensuring it fully closes into the frame. This is critical for securing the door and maintaining its functionality in fire-rated or climate-controlled environments.
To adjust the door closer latch speed:
Step 1: Locate the “L” adjustment screw.
Step 2: Turn the screw clockwise to slow the latching motion or counterclockwise to speed it up.
Step 3: Ensure the door closes firmly without slamming.
In some door closers, the adjustments are labeled as “1” and “2” instead of “S” and “L.” These numbers correspond to the same sweep and latch speed adjustments:
While the function remains the same, manufacturers use different labeling systems. Always refer to the instruction manual for your specific model to avoid confusion during adjustment.
Step 1: Identify the Adjustment Screws: Look for “S” and “L” or “1” and “2” on the closer body.
Step 2: Use the Right Tool: A flathead screwdriver is typically needed.
Step 3: Adjust the Valves: Turn each screw incrementally, testing the door’s movement after each adjustment.
Step 4: Fine-tune the Settings: Balance sweep and latch speeds for smooth, controlled operation.
To adjust the overall door closer speed, focus on the hydraulic valves. Combine adjustments to both “S” and “L” to ensure the door closes at a comfortable pace without compromising safety or functionality.
Properly adjusted door closers play a crucial role in meeting ADA (Americans with Disabilities Act) requirements. ADA standards mandate that doors must:
By ensuring precise adjustment of the door closer valve adjust screws, you can maintain compliance and create a safer, more accessible environment.
Understanding the L and S on door closers and their roles in sweep and latch speed adjustments is essential for maintaining door functionality and safety.
Whether you’re fine-tuning the door closer adjustment screws or troubleshooting common issues, mastering these settings ensures smooth operation and compliance with safety standards.
Proper adjustment not only extends the lifespan of the closer but also enhances user experience in any space.
