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regulators and my system

On Tue, 12 Sep 2000 08:30:46 +1000, Neil Travis <travisn at gravity_net.au> wrote:

> In all my postings I never advocated a 2 stage but just quality regulator.
> (snip)
> The system I use is a fixed non adjustable regulator down line sensed with
> an output pressure of 3 Bar metered with needle valves to my tanks. They
> keep a constant 3 bubbles per second until the tank is empty.

Neil, could you please tell us more about how you are able to maintain a 
constant 3 bubbles per second until the tank is empty? 

What is the key difference between your system and those which are 
susceptible to dumping under end-of-tank conditions?  (Is it because you
have a *down-line* sensed regulator and others probably don't?)  

Also, in your system, does the pressure on the inlet side of your needle
valve vary significantly during end-of-tank conditions?  

If it doesn't vary, could you suggest any technical specifications to look 
for in a regulator so that someone else can achieve similar results?

If it does vary, I'm guessing that you've got great needle valves which are 
able to deliver a constant flow despite the increase in pressure.  Any
buying advice here?

thanks in advance,

David (B.)