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Old 03-16-2012, 10:15 PM   #1
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2 stage automatic/changeover lp regulator woes

Howdy folks,

I am in the middle of a year long overhaul of a 1963 Avalair. I ordered up a new lp regulator, thinking I would be smarter and safer.


I was trying to test out the old original fridge and noticed I wasn't getting any lp. So through a process of elimination (and through breaking fittings loose) I worked my way all the way back to the regulator.

I am not getting any lp through one side, and the other is very slight. The one that is slight is possibly working right. When I put my finger over the outlet fitting, the indicator rises to represent a full tank. The other one doesn't. No matter what position I move the valve to.

I can only assume that I have a bad regulator.

What say Ye?
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Old 03-16-2012, 11:29 PM   #2
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This ye says that any 50 year old regulator needs replacing. 20 years is about max in my opinion.
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Old 03-17-2012, 12:18 AM   #3
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Quote:
Originally Posted by Roothawg View Post
I am not getting any lp through one side, and the other is very slight. The one that is slight is possibly working right. When I put my finger over the outlet fitting, the indicator rises to represent a full tank. The other one doesn't. No matter what position I move the valve to.

I can only assume that I have a bad regulator.

What say Ye?
I am assuming here that you are referring to your new regulator.

I am also sort of assuming you have current standard LP tanks with the OPD valves with flow limiting.

You might try shutting off all LP appliances, turning off both tank valves (to reset flow limiting devices, if tripped) turn tank valves back on, then start LP appliances one at a time. I always light the stove first as it is closest to the regulator. It takes a minute or two to purge the air out of the gas lines before the stove will light.)

It's possible you have a large leak in the gas plumbing on the low pressure side of the regulator which causes the flow limiters in the tank valve(s) to operate as soon as the valve is opened. Other than that, yeah, sounds like it might be a defective regulator.
,
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Old 03-17-2012, 12:30 AM   #4
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There are no appliances in the loop. I was testing the fridge by itself.
The regulator is brand new. The tanks are just the standard small, tongue mount bbq grill style.
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Old 03-17-2012, 01:09 AM   #5
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Roothawg

Usually the regulators are fairly reliable.

Nuvite-F has identified the most likely source of trouble. The OPD valves do incorporate an excess flow check valve which can trip surprisingly easily. Close the valves on the tanks completely and open them slowly and see if that resolves the problem.

Also, stating the obvious, you would want to be sure that you did not inadvertently mount an empty tank.
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Old 03-17-2012, 06:55 AM   #6
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The above posts are correct. If you have had the bottles filled recently, the opd may be shut. In the past, I have had to drop a full bottle a couple inches on a hard service to get the device to open.

There may be a ballcock valve under the trailer in the line that supplies the refer.

Regards,

JD
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Old 03-17-2012, 07:49 AM   #7
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Ah, are you certain that you have propane in the cylinders? (By the way, are those the original cylinders? If so, they may need both certification and OPD valves.)

Lynn
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Old 03-17-2012, 07:54 PM   #8
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Nope, they are new tanks. I know they work because I can swap from side to side and the "good side" always works on whatever tanks I have. I think I just got lucky again and got the one made at 4 pm on Friday.

I was just curious if both had to be hooked up at the same time, in order to equalize or something crazy. I can switch the valve manually and it still doesn't work.
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