Commercial door closer adjustment: valves, spring and closing time

This section and those after it were checked on 1 October 2026 against the sources listed on this page.

Commercial door closer adjustment starts with the spring, then the valves: set the spring power for the door, then time the swing with the sweep and latch valves and set the backcheck for a slight cushion. On the Norton, Sargent and dormakaba closers checked here, a valve turned clockwise slows the door; counterclockwise speeds it up.

In order, from the makers’ instructions:

1. Door first. Norton and Sargent call for ball bearing or anti-friction hinges; dormakaba says to make sure the door operates efficiently before the closer goes on.
2. Spring power next. Norton: always adjust spring power before adjusting control. dormakaba: confirm the spring size before any closing speed adjustment.
3. Sweep, then latch. Time the door from 90 degrees open. The sweep valve sets most of the swing, the latch valve the last few degrees; target times are in the ADA section below.
4. Backcheck. Sargent: set it for a slight cushion, because too abrupt a check damages the closer. Norton and Sargent: never close the backcheck valve completely.
5. Delayed action, where fitted. On the Sargent 281, clockwise slows the door through the delay range. Norton puts every adjustment before the cover goes on.

How far should each valve turn?

None of the instruction sheets opened here gives a fraction of a turn; they give a target time and hard limits. Norton: backing a valve out of the closer makes it leak. Sargent: fully opened valves will leak. dormakaba: never back a valve head out beyond the casting or close a valve completely.

A door that slams shut is closing too fast in its latch or sweep range: turn that valve clockwise to slow it. A door that stops short of the latch needs the opposite, a little more latch speed (counterclockwise) or more spring power, which Sargent says to set at the minimum force that closes and latches the door reliably.

• Slams shut. A bang in the last few degrees is the latch valve; a fast swing throughout is the sweep valve.
• Slams open. That is backcheck: clockwise adds cushion, kept slight, and a door stop is still required (Sargent).
• Will not latch. Sargent calls the latching speed adjustment critical for latching and says the closing force comes from the spring: if the door does not latch, increase power; if it is hard to open, decrease it slightly. Norton adds that the spring may need readjusting once the sweep and latch are set.
• Low opening force. Norton and dormakaba warn that a closer adjusted to a reduced opening force may not close and latch reliably, Norton naming wind gusts and building stack pressure; Sargent, that high power set to beat strong drafts may exceed ADA standards.

Does cold weather change a closer’s adjustment?

The makers say their fluid is made not to need it: Norton rates its NorGlide fluid stable down to minus 40 degrees F, Sargent says the 281 works in extreme temperatures without readjustment, and BEST designs its HD7000 to minimize change in closing speed during severe temperature changes. Norton and Sargent both rule out mounting a closer on the weather side of an exterior door (Sargent: it voids the warranty); for strong drafts, Sargent’s answer is more spring power.

We supply listed hardware and confirm in writing the part number and options you have chosen. We are not code consultants; your Authority Having Jurisdiction (AHJ) makes the final call.

Where the 2010 ADA Standards apply, section 404.2.8.1 requires a closer adjusted so the door takes at least 5 seconds to move from 90 degrees open to 12 degrees from the latch, and section 404.2.9 limits the force to open an interior hinged door to 5 pounds (22.2 N).

Section 404.2.9 leaves fire doors at the minimum opening force the appropriate administrative authority allows, sets no figure for exterior hinged doors and excludes the force to retract a latch bolt. The makers time doors differently:

So several makers’ ranges start below 5 seconds, and the ADA clock stops 12 degrees short of the latch while the makers’ clocks run to closed: a door timed at exactly 5 seconds to closed reaches 12 degrees in under 5. Norton and Sargent both say elderly or disabled users may need a longer closing time (Norton adds small children), and Sargent recommends its alternate regular arm mounting position for ADA compliant doors.

For opening force, dormakaba’s 8916 instructions say to take an opening force reading from the pull on the door and adjust the spring until the barrier-free force is met. The rest of section 404 is in our guide to ADA door requirements.

We supply listed hardware and confirm in writing the part number and options you have chosen. We are not code consultants; your Authority Having Jurisdiction (AHJ) makes the final call.

A door closer leaking oil is replaced, not adjusted. None of the maker documents opened here gives a way to reseal or refill a closer: Sargent’s parts manual lists the 281 closer body as one part, with no seals or fluid, and dormakaba says a closer must be replaced once its functional reliability can no longer be ensured.

• How closers come to leak. Norton: do not back valves out of the closer or a leak will result. Sargent: do not completely open the valves, which will leak. dormakaba: do not back a valve head out beyond the closer casting. dormakaba’s safety advice, written for its UK market, lists a broken closer losing hydraulic fluid among the consequences of misuse, such as the wrong closer size or a door hindered by sticking seals or misaligned hinges.
• A door the spring cannot close. Norton’s catalog says wind, stack pressure or a door taller or heavier than its 1-3/4 in by 7 ft chart door may need a different spring setting, a larger size closer or a different closer. BEST’s HD8056 and dormakaba’s 8956 run from size 5 to 6 plus 50% for exceptionally wide, tall or heavy doors.

Choosing the replacement by size and arm is in types of door closers and how to choose one. The Norton 8501 door closer we list adjusts through sizes 1 to 6 on doors 28 to 48 in wide; others are under surface closers, Grade 1 and 2. Send a photo of the old closer, its arm and the frame head, and we identify it and quote the same business day.