Too many revolutions of the valve can result in the valve completely unscrewing from the closer body, causing all hydraulic pressure to be lost.ĪDA and Closing SpeedAccording to the Americans With Disabilities Act (ADA) standards, section 404.2.8 states that door closers must take atleast 5 seconds to close from 90 degrees to 12 degrees of the closing cycle range. It is always recommended that when making adjustments only turn the valves 1/8 to 1/4 turn at a time. S and L Valve AdjustmentsTo increase the "S" (sweep) or "L" (latch) speeds, the valves can be turned clockwise to increase speed, and counter-clockwise to decrease speed. Where "1" is the sweep speed adjustment valve and "2" is the latching speed valve adjustment. "1" and "2" Are On The Door Closer, Not "S" and "L"On some door closers the term "S" and "L" are not used, instead a numeric system is used "1" and "2". The latch valve adjusts the closing speed of the door during the latch range. On the illustration above the portion of the door closing cycle from approximately 15 degrees to 0 degrees is the the latch range of the closing cycle. "L" Stands For "Latch"The "L" valve on the side of the door closer stands for "latch". The sweep valve adjusts the closing speed of the door during the sweep range. The sweep refers to the portion of the closing cycle from the 180 degree full open position to approximately 15 degrees of the closing cycle. The illustration above shows a door's closing cycle. "S" Stands For "Sweep"The "S" valve on the side of the door closer body stands for "sweep". In fact, if the "S" and "L" valve are adjusted it is best to only do a 1/8 to 1/4 turn at a time. Doing so, will cause the door closer to lose hydraulic pressure, and will ruin the door closer. For these reasons, the "S" and "L" valves are not designed to be completely unscrewed and removed. O-ring seals are also used to ensure air does not get into the closer body which could create problems when the hydraulic fluid is put under pressure. On the valve are o-ring seals which are needed to ensure that the closer body remains sealed since it holds the hydraulic fluid. The valve is threaded and designed to be turned clockwise to restrict the flow of hydraulic fluid, or counterclockwise to increase the flow of hydraulic fluid. The illustration above shows the "S" and "L" valves removed from the door closer body. Although they appear to be a hex key type of screws, they actually function as valves to regulate hydraulic fluid from one chamber within the door closer body to another chamber within the door closer body. On the side of a standard door closer body are two hex key screws, one with the letter "S" above it, and the other with the letter "L" above it. In this article we explain what the "S" and "L" stand for, their function, how they are used on door closers. What Does S and L Mean On A Door Closer?If you have ever tried to adjust a commercial door closer you may have noticed two hex key screws on the side of the door closer labeled "S" and "L".
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