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Qualitydoor.com > Closers > Door Closers > Norton 78-B/F-DA Delayed Action Traditional Surface Door Closer

Norton 78-B/F-DA Delayed Action Traditional Surface Door Closer

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SKU: 78B/D-DA-689

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Norton 78-B/F Series Catalog

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Norton 78-B/F Series
Delayed Action Surface Door Closer
Traditional Surface Door Closers

• Aluminum alloy shell
• Spring power adjustment
• Speed regulating valve
• Backcheck cushioning regulating valve

Norton® closer shells are constructed of a special aluminum alloy, carefully selected to accommodate individual closer characteristics and operating conditions.

These Norton Traditional Surface Closers have an unusual ability to accommodate power adjustment to their environment. The adjustable clock coil spring provides a small incremental increase or decrease through a wide range of closer power. They can be adjusted to meet the exact power requirements of the installation. Sweep speed, latch speed and backcheck cushioning can also be adjusted to door, frame and variable conditions.

Adjustable Delayed Action Closing
An optional hydraulic feature, available in lieu of backcheck, adds a third speed range to the closing cycle. This feature becomes effective when the door is opened and released at any point beyond 70°. The amount of time delay depends upon the combination of the angle of door release and valve adjustment. The valve can be adjusted with a 1/8" (3mm) hex key from no delay time up to maximum delay times of:

Door Opened and Released at	Approximate Time of Delay Cycle
180°	4-5 minutes
120°	2-3 minutes
90°	25-30 seconds

Templates:

Norton 78-B/F Series Catalog

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