Yes, that's correct. Min Venturi leaves just 20% of the opening visible from the mouthpiece, and two boxes are showing. You can't close it further, nor would I want to.
The flow path from this valve is so short and so direct to the mouthpiece, that it's bound to be sensitive. Flows from the valve are huge.
Max manual adjustment of the old D400 gate by the technician was "1-3 clicks", which still left 70% of the flow path open. You'd never close it more. It's very sensitive.
The new Venturi diverts part of the flow around the front of the housing toward the diaphragm to eliminate Venturi assistance of valve opening.
Putting the Venturi on "2 boxes" (min) will eliminate freeflow on giant stride in all but the most hot-tuned regs. And you'll easily feel the difference in flow between Max and Min.
The flow path from this valve is so short and so direct to the mouthpiece, that it's bound to be sensitive. Flows from the valve are huge.
Max manual adjustment of the old D400 gate by the technician was "1-3 clicks", which still left 70% of the flow path open. You'd never close it more. It's very sensitive.
The new Venturi diverts part of the flow around the front of the housing toward the diaphragm to eliminate Venturi assistance of valve opening.
Putting the Venturi on "2 boxes" (min) will eliminate freeflow on giant stride in all but the most hot-tuned regs. And you'll easily feel the difference in flow between Max and Min.