Good Sam Club Open Roads Forum: Automatic air tank drain valves
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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > Automatic air tank drain valves

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Cindy and Steve

Azilda

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Posted: 10/24/21 01:04pm Link  |  Quote  |  Print  |  Notify Moderator

Johnny G1 wrote:

Known as a Spitter valve, found on most trucks and can be heard every few minutes, some are electric and some are pressure driven. Listen to them for the better part of my life as I put in 60# yrs over the road.


So what’s it’s purpose? Is it just to let water out if the tank?


2000 Newmar London Aire. 40’, Spartan chassis, 350 Cummins, Allison 6 sp, air ride, air brakes.

Cindy and Steve

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Posted: 10/24/21 01:09pm Link  |  Quote  |  Print  |  Notify Moderator

MT BOB wrote:

Heated automatic drain valve is what it looks like. What is the make/name on it?


Midland. And while I was blowing up the pic to read that, I also noticed the smaller print which says “automatic drain valve”. So I guess that confirms that LOL. But what if one were to fail? I wouldn’t know. I wouldn’t be able to drain the tanks manually.

MT BOB

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Posted: 10/24/21 01:47pm Link  |  Quote  |  Print  |  Notify Moderator

They spit out moisture and moisture laden air every time there is a pressure change.
OPERATING TEST
With system charged, make several foot valve applications

and note each time an application is made, an exhaust of

air occurs at the exhaust port of the drain valve.

MT BOB

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Posted: 10/24/21 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

Now, unless federal laws have changed, if you have no manual drains on your primary and secondary tanks, then you MUST have a 3rd tank,a wet tank, first in line from the pressure from the air compressor, and it will have a manual valve. However, has been along time since I have worked on the big stuff, there might be something new.

Cindy and Steve

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Posted: 10/24/21 07:51pm Link  |  Quote  |  Print  |  Notify Moderator

MT BOB wrote:

Now, unless federal laws have changed, if you have no manual drains on your primary and secondary tanks, then you MUST have a 3rd tank,a wet tank, first in line from the pressure from the air compressor, and it will have a manual valve. However, has been along time since I have worked on the big stuff, there might be something new.


On our RV there are two tanks. One is the wet tank and the other is divided internally so it actually is two tanks together. Each half has its own drain valve. All the valves are these automatic type.

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