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Re: "My last word on needle valves..."

> From: Dave Gomberg <gomberg at wcf_com>
> Subject: My last word on needle valves....
> It seems to be quite well 
> built and to allow you to regulate the flow pretty accurately, even when 
> the input pressure to the valve is 30 psi.
> Now the bad news:
> I left the valve in place overnight.   This AM, the hose connecting the 
> regulator to the Fabco valve had blown off the regulator and dumped the 
> whole CO2 cylinder.

	That (200 kPa) seems a pretty high pressure to leave on a hose.  I use
stainless steel tubing and Swagelok fittings between the regulator and
the needle valve, and that is for a pressure of less than 50 kPa.
It's overkill, I know, but it means I _can_ use much higher pressure
if I want to.

> So all in all, I have to say the risks of a needle valve outweigh the 
> benefits FOR ME.

	I think that is a risk of a _hose_ not a needle valve.

Paul Sears        Ottawa, Canada