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Sonic flow

To: "Aquatic-Plants at actwin_com" <Aquatic-Plants at actwin_com>
Subject: Sonic flow
From: conwayte <conwayte at enter_net>
Date: Sat, 20 Jan 2001 20:16:54 -0500



>Yes, I was running my regulator flat out into the needle valve.  Unless 
>there is quite a pressure drop across the valve, the flow will not go sonic 
>and the valve will not restrict the flow as desired.


Sonic flow is achieved roughly when the upstream pressure is 2 times the 
downstream pressure.  And for a fixed opening ( a needle valve kept at a 
constant setting ), increasing upstream pressure increases flow 
regardless if you are sonic or not.

Tim

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