Furnace gas valve

JBarca wrote:

Bob E. wrote:
My furnace is an older hydro flame 8531-II. the gas valve is not functioning so I was going to order a new one. But it appears that part number 31155 is no longer available. Does anyone know if the gas valves are more or less the same? I found one that looks similar except the propane inlet fitting is on the side rather than the back. Mine actually has a couple of fittings that connect to the propane line in the side. So I’m wondering if this alternate part would work.

Hi,

I'm not sure where you found the Atwood 31155 aligns to the Atwood 8531-II.

From the 2015 service manual, they call out 38607 for the 8531-II. And and the 38607 is now obsolete and I found the trail that 31150 is what replaces it. The 2015 manual says the 31155 fits the 85XX-LD furnace.

I have bought and installed 2 of the 31150 this year with the last installed one in October. And ordered 2 more for stock last week.

See if this will work on your setup. Pics below.

The 31150 looks like this




A bench leak test on the new one before I intall.


The is the old one leaking, but a pic of the orfice tube you have to move from the old to the new.


Duct tape is over the gas line brass fitting for the inlet


If the 31150 is what you are looking for, here are 2 places I have bought from with positive outcomes.
https://pantherrvproducts.com/31150/?gclid=Cj0KCQiAy4eNBhCaARIsAFDVtI1_GmJlz19kVMwZV8JZAGXS8hQVNCG9EVyOTf7f5OvMM7AB7R9DGBQaAgTUEALw_wcB

https://www.rvupgradestore.com/Atwood-31150-Gas-Valve-For-Hydro-Flame-Furnaces-p/41-0100.htm?gclid=Cj0KCQiAy4eNBhCaARIsAFDVtI2PeuzQvWTDtv2skPmkGa3H-iGMLDHKaOknuwlIIxH2F8TdSitIP1saAq7OEALw_wcB

https://www.dyersonline.com/atwood-38604-furnace-hydro-flame-side-out-gas-valve.html

Hope this helps

John

For the 31150, the gas outlet is in the wrong place. In your 2nd photo, the gas outlet is on the far side. On the 31155, the gas outlet would be to the right where your finger tips are, which is how mine is. Once mine is mounted in the furnace, the solenoids sit upright and the gas flows straight through from back to front. I suppose I might be able to rotate a 31150 and mount it sideways and use some fittings to get the gas line to the inlet port, which would face down, which is how it looks like yours is mounted. But I don’t have that L-shaped tube between the valve and the burner that is shown in your last photo.

Do you know if those caps with the allen head screws are removable? If so, could I swap the outlet from the side to the front?