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Date:         Mon, 9 Jan 2012 21:16:44 -0500
Reply-To:     Edward Maglott <emaglott3@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Edward Maglott <emaglott3@GMAIL.COM>
Subject:      Re: New Propane tank fill valve/fitting
In-Reply-To:  <4f0b9ae5.45c3e00a.37ec.56ee@mx.google.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

Dang, you are so right on the 1 3/4" already being on the van. I confused myself. Mine has already been converted to the manual fill system. Edward

At 08:56 PM 1/9/2012, you wrote: >Erm...what you already have on there is a 1 3/4" Acme valve, unless >someone has been seriously messing with things. It's *not* the same >as what's on a 20 lb BBQ tank. That's Acme but much smaller >diameter. I initially thought that the valve you pointed to was of >this smaller size (one-inch?) which is why I responded as I did. If >you have the OEM valve still present, it has an automatic stop >facility which makes it more complicated and expensive - the tank >fitting that acts as a level gauge (by passing liquid instead of >vapor when the tank is filled to 80% of its "water capacity") is >plumbed into the side of this valve which detects the passage of >liquid and closes against the incoming fill. > >The valve you're looking at doesn't have this complication and >requires the operator to observe when liquid starts coming from the >opened gauge valve and stop filling at that point. If he doesn't >stop immediately you then have to continue bleeding off the liquid >until you get back down to vapor coming from the valve. > >New ASME tanks (the kind we have, stands for the American Society of >Mechanical Engineers) have a float-type shutoff similar to the ones >now required in DOT (Department of Transportation, BBQ-type) >tanks. Unlike the DOT tanks however there is no requirement to >retrofit such valves to existing ASME tanks, nor is there any >requirement for periodic testing/recertification of ASME tanks which >are constructed much more heavily than DOT tanks. If you bought a >new tank from Manchester Tank it would come with the float-type shutoff. > >But regardless, all these tanks (manual shutoff, liquid-flow >shutoff, float-type shutoff) are filled from the same hose, or the >same adapter if it's an outfit that primarily fills DOT tanks. > >If you *were* to put a BBQ-tank valve onto one of our tanks you >would have to remove the Overfilling Protection Device (float-type >shutoff) from the valve, and would be in at least a questionable >area regarding whether the tank would still be considered certified >as an ASME tank. In practice I think you would have difficulty >finding people willing to fill it for you, though that is a >guess. And you'd still have to install and use the manual gauge >valve. If you *did* find people willing to fill the tank I think >there would be an increased risk that the operator would fail to >open the gauge valve, since they're spring-loaded by now to expect >the BBQ tanks to shut themselves off without any operator intervention. > >Purely by the way - the Acme designation no doubt comes because the >external thread used to couple the fill hose onto the valve has the >"Acme" thread form which is commonly used for leadscrews on lathes >and similar machinery and other power-transmission uses. It's a >modification - stronger and easier to machine - of the square thread form. > >Yours, >David


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