What Is a Delayed Action Door Closer and When Do You Need One?

When you swing a door open past roughly 70–75°, most closers slam the door back without warning. A delayed action door closer doesn’t. It pauses the door for a few seconds, then resumes a normal closing arc.

The pause comes from a separate hydraulic valve inside the closer body. When the door opens past the trigger angle, that valve restricts oil flow. Once the hold time ends, a second valve takes over and pulls the door closed through sweep and latch.

How It Differs from the Other Valves

Closers have up to four adjustment valves. Each one controls a different part of the closing cycle:

• Sweep — the main closing speed from full open to about 10–15°
• Latch — the final snap that seats the door into the frame
• التحقق من الخلف — resistance during violent openings (wind, abuse)
• إجراء مؤجل — the hold-open pause between 70–75° and the start of the sweep

Delayed action is the only valve that slows the door on the way open, not the way closed. Keep that in mind when reviewing spec sheets.

Where Delayed Action Is Actually Required

The short answer: anywhere a slow-moving user needs time to clear the opening. The most common cases:

• Hospitals and clinics — wheelchairs, gurneys, IV poles
• Care homes and assisted living — walkers, residents with limited mobility
• المدارس والجامعات — students carrying books, accessibility routes
• Public buildings under ADA or IBC scope — accessible entries and egress routes
• الفنادق — luggage carts, accessibility rooms

It’s not a universal requirement. Adding delayed action to a low-traffic storeroom or back-office door costs more without buying you anything.

Three Questions to Decide If You Need It

Run your project through these before specifying:

1. Who uses the door? Wheelchairs, beds, carts, and the elderly all need the pause. Office staff in a back corridor do not.
2. How wide and how heavy is the door? Delayed action only works on closers rated for the door’s size and weight — usually Grade 1 or Grade 2 in ANSI 156.4 terms.
3. Does code or the project spec require it? ADA, IBC, and most healthcare facility guidelines call for delayed action on accessible doors in certain occupancy types. If the spec says “accessibility compliant,” that usually means delayed action is in scope.

If the answer to all three is yes, you need a closer with an adjustable delayed action valve, not just a basic model.

Specs Worth Checking Before You Order

When comparing models, look past the marketing line and read the actual cut sheet:

• Adjustable hold range — most quality closers offer 5–30 seconds; some are fixed at the factory
• Independent valve design — the delayed action valve should be adjustable without affecting sweep or latch speeds
• Backcheck included — delayed action and backcheck are often sold together; missing backcheck on a high-traffic door is a common spec error
• امتثال — EN 1154 for European projects, ANSI/BHMA A156.4 for North American projects

If the cut sheet doesn’t list a separate delayed action adjustment, the valve probably isn’t there.

جهاز إغلاق الباب 5023AWY

مقاس: 182 مم (طول) × 61 مم (ارتفاع) × 41.5 مم (عرض)

البصمة: 162~166مم×19مم

قوة: En2/3/4 قابلة للاختيار

وزن الباب: 25-85كجم

عرض الباب: 900مم~1050مم

عرض التفاصيل والاستفسار

Wrapping Up

Delayed action solves one specific problem: giving people time to clear the opening before the door starts closing. Specify it when accessibility, healthcare, or code compliance demands the pause. Skip it for back-of-house doors where the cost doesn’t pay back.

Need help matching a closer to a project spec? Send your door dimensions, traffic type, and applicable code — OUDE can recommend a model with the right valve configuration.