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Re: "My last word on needle valves..."
- To: Aquatic-Plants at actwin_com
- Subject: Re: "My last word on needle valves..."
- From: Paul Sears <psears at nrn1_NRCan.gc.ca>
- Date: Thu, 18 Jan 2001 09:15:54 -0500 (EST)
- In-Reply-To: <200101180848.DAA19188 at actwin_com> from "Aquatic Plants Digest" at Jan 18, 2001 03:48:03 AM
> 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