[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[APD] Re: Ooch
"Is it that the pressure differential with the CO2 set-ups is not great
enough for a sonic velocity to be acheived at the metering valve (critical
pressure ratio?) or that the metering valve opening in these setups is too
large for critical flow?"
Both and neither because we aren't using the valves in a way that any of
Here's a simple experiment, especially for the Fabco NV-55. Set the
regulator to about 25 psi and the valve to a couple of bubbles or so per
second. A typical setup. Now apply some suction to the line out of the
bubble counter (don't inhale). If the bubble count increases, then by
definition it wasn't sonic to begin with. Yet all these needle valves do a
perfectly fine job of preventing a dump. Why?
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com