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Old 03-14-2006, 08:28 PM   #1
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OPD valve with Remote Read Gauge

I finally ran out of connections for companies willing to fill my 40 lb Worthingtons without the OPD. Oh well.
So I took them to my local guru to have the valves changed and asked for remote read gauges. He can't find them and neither can I. I know Steve over at VTS sells new tanks with gauges but where can I find just the valves. All that I can find have a separate bore for the Gauge but my tanks just have one bore for the whole system. Oasis says they are available for 30 pounders but not the big ones. Anybody know?
I did a quick search here on OPV but didn't find anything. Thanks guys.
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Old 03-14-2006, 08:44 PM   #2
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Randy,

The guages on the tanks are a very rough indicator as they work on tank pressure....but most of the propane in the tank is in liquid form and the pressure is not a true indicator of the amount of liquid propane remaining in the tank. Better off with 2 tanks and an auto change regulator.
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Old 03-14-2006, 08:49 PM   #3
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Thanks Lew. I have two tanks and the auto changer but the indicator in the control panel is what I want to work. Not that big a deal until I realized i might not be able to have it if I really wanted it! I know they are not that accurate but I like gauges. Gives me something to look at instead of American Idol.
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Old 03-18-2006, 05:11 PM   #4
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Guages

Home depot has an external guage.
When you convert the valve you lose 20% capacity of your tank.
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Old 03-18-2006, 08:10 PM   #5
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Quote:
Originally Posted by Stagehand
Home depot has an external guage.
When you convert the valve you lose 20% capacity of your tank.
RIGHT! But any LP tank (like the ones on all Airstreams) can only be filled to 80% capacity. There has to be that 20% left at the top to allow space for the liquid propane to boil and vaporize into a gasseous state so it can move thru the suppply lines at low pressure.
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Old 03-18-2006, 09:31 PM   #6
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The new OPD valves have a float that shuts them off when the liquid gets to 80% to help prevent accidental overfilling. This float is why you don't have any OPD valves with proper level indicators. You have to get a two port tank so you can use one for a fluid level float and the other for the OPD.

Tank fillers should still open the vent and shut off the fill when liquid starts spitting from it.
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Old 03-20-2006, 07:11 AM   #7
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The colder it gets....

Quote:
Originally Posted by 68 Overlander
Thanks Lew. I have two tanks and the auto changer but the indicator in the control panel is what I want to work. Not that big a deal until I realized i might not be able to have it if I really wanted it! I know they are not that accurate but I like gauges. Gives me something to look at instead of American Idol.
I don't know where you live; but the colder it gets, the less efficient propane becomes. The b.t.u. output dramatically decreases as the temperature drops...

Those control panel gauges for propane never worked....
I would get a large tank with an adaptor valve & have it refilled where you are if possible
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Old 03-21-2006, 09:47 AM   #8
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The pressure Gauge with a single bore not being accurate makes perfect sense. A double bore tank with a separate float also makes sense, and I see them in many catalogs and stores.
I just had the valves changed without gauges. I guess I'll use the control panel indicators for something else like... oh I don't know, maybe a wind speed indicator or something!
Thanks guys.
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Old 03-21-2006, 10:13 AM   #9
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Quote:
Originally Posted by Jim Jarzabek
... The b.t.u. output dramatically decreases as the temperature drops...
No, what really happens is the vapor pressure inside the tank drops dramatically as the temperature drops, so the ability of the tank/valves (like an auto-switch valve, which relies on pressure to operate and therefore has some pressure drop) to deliver sufficient flow is impaired. The b.t.u.s per mole (yeah, good old Avagadro) of propane burned is constant.

And the 80% tank limit might have some impact on allowing more surface area for propane vaporization, but what it's really for it to ensure that as the temperature of the propane increases (sunny day, etc.), there is enough expansion room for the liquid so as to not explode the tank from overpressure. When propane is a liquid, it's incompressible (you can only change its volume with temperature, not pressure). It has a high thermal expansion coefficient, so you have to leave serious gas volume in a "full" tank to allow for this.

If you're having trouble getting enough propane for your heater, check to see if your auto-switch valve is OK. If it's still a problem, you'll have to put in a "T" connection and switch tanks manually.
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Old 03-21-2006, 10:49 AM   #10
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If you want somewhat more accuracy, try your bathroom scale. The collar of your bottle has a marking "TW" indicating the empty weight of the bottle. You're probably using a 30 pound bottle (7 gallons, more or less), so add the TW to the 30 to know the weight when it's full of propane. The closer your bottle's weight is to the TW, the closer you are to being empty.


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Old 03-21-2006, 10:55 AM   #11
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I have two 40 lb bottles with the change over so it's really not a big deal. I just kinda wanted the control panel to work, that's all.
I don't see myself toting the bathroom scale to the tongue of the trailer each morning but I have done things that will rival that.
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Old 03-27-2006, 11:51 PM   #12
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Try this link not sure if it will work? I have a 75 with the same problem?
http://www.cramerdecker.com/catalog/38-39.pdf
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Old 04-02-2006, 11:51 AM   #13
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I don't think that will work but thanks for the link. If it doesn't have the capability to send the info remotely to the control panel, it doesn't make sense. If I have to visually inspect the bottle, the auto change indicator is good enough and like mentioned, the pressure sensing types are probably not accurate enough. I'm convinced the tank needs a separate bore with a float like the new models have. Thanks.
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Old 04-07-2006, 11:08 PM   #14
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I believe you are right, I did some searching myself and was told that some of the manufactoers are working on making OPD valves with a gauge, but they are no on the market yet? I wont hold my breath.
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