CO2 valves with pressure gage?

Does anyone know of a CO2 control valve that has a pressure gage? I use
CO2 cannisters for my riding and thought it would be handy to be able to
read the pressure. Maybe there's physics reason why this might not
work, but thought I'd throw it out for comments. Thanks.

John

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On Tue, 08 Mar 2005 09:43:26 -0800, John
wrote:

Does anyone know of a CO2 control valve that has a pressure gage? I use
CO2 cannisters for my riding and thought it would be handy to be able to
read the pressure. Maybe there's physics reason why this might not
work, but thought I'd throw it out for comments. Thanks.

John

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Dear John,

There may be such a CO2 inflator with a pressure gauge, but
I'd expect that the gauge wouldn't work well because of the
impressive temperature drop at the nozzle as the liquified
CO2 expands into gas.

Brrrr!

Carl Fogel