FX Huma gen 3 reg for Impact/Crown question

[bchannell]

Huma, "previously" made three regulator belleville sets for the gen3 crown/impact regulator.
1) a low pressure stack which has 10 single stack 0.5mm washers (60-135 bar)
2) a high pressure stack which had 12 double stack 0.4mm washers (currently discontinued)
3) a extra high pressure stack which has 8 single stack 0.6mm washers (100-200 bar)

I have the current gen 3 in extra high #3 in my Impact right now. It is rated to go down to only 100 bar. #2 above is made for 60-135 bar, which I may buy washers for that.
Huma has discontinued #2, stating that #1 & 3 cover the ranges needed.

I also have a #2 reg, and my question is ... I can't find a pressure range for it anywhere. My WAG is that it goes from something like 80-150 bar, but I'm purely guessing. Does anyone know what the range is on this discontinued reg?

 

[jps2486]

Nothing wrong with the OEM regulator, IMO.

 

[nervoustrig]

The maximum pressure of a particular Belleville stack is a pretty straightforward calculation if we know the washer's flat rating and the piston's dimensions (its end diameters). The minimum pressure is then somewhere in the ballpark of half the max.

So for your particular regulator, the 0.4mm thick Bellevilles are a dimensional match to McMaster 96445K211 and 96475K211. These have a flat rating of 59-64lbs, so we're talking about 120lbs for nested pairs. Running the calculation for the Impact/Crown reg (4mm / 7mm piston) says it would top out around 210bar. The min is about half the max so we're talking about a range of 105-210, meaning this configuration (#2) is not appreciably different from #3.