Features Aluminum Alloy Shell: Norton® closer shells are constructed of a special aluminum alloy, carefully selected to accommodate individual closer characteristics and operating conditions. Adjustable Spring Power: Clock-type coil spring affords a wide range of closer power. Permits a fine adjustment of the closer to the environment. Rack & Pinion Operation:Provides a smooth transmission of power for control of the door through its full opening and closing cycle. Adjustable Sweep/Latch Speed:A dual purpose regulating valve, hex-key-operated, permits independent adjustment of both sweep and latch speed. Adjustable Backcheck Cushioning:An independent regulating valve, hex-key-operated, provides an adjustable hydraulic cushion to the door opening speed toward the end of the opening cycle. This feature is standard with all but Delayed Action closers. Backcheck is not available with Delayed Action closers.
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