Turn clockwise to slow down turn counter clockwise to speed up.
Slide right door closer adjustment.
Remember when it comes to turning commercial door closer adjustment screws a little goes a long way.
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Turn phillips screw on air valve to adjust speed.
Turn the adjustment screw clockwise to slow the closer down counter clockwise to speed it up.
If none of these adjustments works then your door closer may be worn out and you will need to buy a new one to replace.
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Start with no more than 1 8 of a turn.
Adjusting speed of closer.
Do not turn more than turn at a time.
Open the door and watch it close.
Most door closer brackets have slotted holes so you are able to slide them left to right to make adjustments without.