Furnace gas valve

Bob E. wrote:

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?

Hi Bob,

It seems there are different versions with the -II rev. I'll add some more pics of the 31150 so you can see if you can make it work. I looked in the 2003, 2007 and 2015 service manual and the -II rev 8500 series furnace called out a different valve part number in each manual. It seems they kept changing suppliers or valves etc along the way. I know the coils are slightly different on the wire connections on the new 31150 verses they old valve (2003 vintage) I replaced, but that did not stop the new valve from working.

The 31150 is made as a 90 degree valve. There is a pipe plug on the non outlet side opposite the actual outlet port, smaller NPT size but there is one. The 31150 had no outlet straight through from the inlet port like is seems you need.

I will have 2 of the 31150's arriving this week. I can take more pics or measure if that helps any.

See here for some more pics I have from earlier this year.

The inlet is on the right in this pic. See the molded in flow arrow.


The opposite side plugged outlet, smaller NPT port


There is no port on opposite end of the inlet port on the 31150


Here is the gas valve installed on the bench in 2010 in these 2 pics. These pics are of a 2003 vintage gas valve as that was when the camper was made the pics came from




Also to note, this pic is from 2010 as the date says and that valve is from a 8530-IV from 2003 which "looks" like it might have had a plugged discharge port straight out opposite the inlet. That feature went away with the current day 31150.


And this pic is of a 8520-IV and the valve is from 2003 installed. It too has what might be a port straight out, but again, That feature went away with the current day 31150.



Hope this helps

John