Posted by MHK on September 24, 2001 at 11:16:35:
In Reply to: At the risk of opening a can of worms... posted by Bob3 on September 23, 2001 at 14:10:31:
That's only one of the reasons they aren't considered DIR, the other major issue is that they are designed to run at higher internal pressures and when they fail, if they do, they will fail closed and not deliver any air as opposed to other regulators that when they fail they free flow and can still deliver air...
Later