Quote: (Originally Posted by
nobody)
Why dont you then use a bigger orifice so you get the same flow with a lower ip?
because it is not about getting a bigger gas flow,
the issue is to keep the orifice at sonic speed so you get a constant gas flow.
The orifice will only stay sonic if the upstream pressure is roughly 2.2 times the ambient pressure, therefore 7 bar will limit you to somehow 30 meters.
If you are happy with such a depth limitation, fine, however most of us aren't.
secondly as you decent the ip stays cosntant, means the pressure differential is reduced, so your solenoide hasn't got a working pressure of 7 bar, but 7 bar minus x (depth), i do not know how much this will impair the gas flow thru your solenoid ?