Alfa Laval heat exchangers use lock washers for the tightening bolt, making the assembly job faster as the lock washer prevents the nut or bolt head from rotating during opening and closing.
This Video will show how to adjust just about any closer.
Taken from a 22 minute with way more inro than an installer needs.
so I shortened this one to just thefacts and the closer body and adjustments.
From Terry, Carpenters Local Union Local #156 Oregon City,Oregon