I have an heil warm air furnace,with a smartvalve gas valve.sv9500n2674... can't find exact number gas valve.only one I found was an sv9501m2813 says replaces all sv9500 valves.can anybody verify this is true.new in the hvac field not too sure.this natural gas unit,not lp.

Propane or natural gas?

This is a Honeywell 2 stage valve I believe.

Honeywell

http://customer.honeywell.com/techlit/pdf/69-0000s/69-1238.pdf

If you are talking about a natural gas furnace, the Honeywell SV9500 ( single stage gas valve) was replaced by a SV9501 gas valve ( both single stage ) Be sure to set the proper manifold gas pressure with a manometer as per the ID label specs, which should be 3.5 inches of WC... so you don't over fire the unit !

If you are talking about a natural gas furnace, the Honeywell SV9500 ( single stage gas valve) was replaced by a SV9501 gas valve ( both single stage ) Be sure to set the proper manifold gas pressure with a manometer as per the ID label specs, which should be 3.5 inches of WC..... so you don't over fire the unit !
Yah but on honeywell web site it says the sv9501 is slow opening valve is that the same as 2 stage.

Every once in a while a manufacturer will request Honeywell or white Rodgers to make a special valve for them. It is possible you have one of those. I would call a Heil HVAC contractor and see if they can fix you up with the same valve you have.

Post the full model number and serial number of your Heil furnace, And I'll tell you want is the correct gas valve for that unit... as per ICP ( Heil's) parts program...

Post the full model number and serial number of your Heil furnace, And I'll tell you want is the correct gas valve for that unit...as per ICP ( Heil's) parts program....the unit is a heil,model #NUGM075EGB1,SERIAL #L953217763... GAS VALVE THAT IS IN UNIT IS SV9500N2674.

The original gas valve is a SV9500M which has the following ICP /Heil part numbers... 1009093,. Their parts program also lists the SV9501M which has the following part numbers... 1096725, and 1170430. These are all single stage gas valves for natural gas. The SV9501 is an up-grade from the earlier SV9500 series. Be sure to set your gas pressure for the manifold side at 3.5 inches of WC for natural gas if that is your gas supply. If NOT, the gas valve has to be converted to run LP / propane gas

The original gas valve is a SV9500M which has the following ICP /Heil part numbers....1009093, ...Their parts program also lists the SV9501M which has the following part numbers... 1096725, and 1170430. These are all single stage gas valves for natural gas. The SV9501 is an up-grade from the earlier SV9500 series. Be sure to set your gas pressure for the manifold side at 3.5 inches of WC for natural gas if that is your gas supply. If NOT, the gas valve has to be converted to run LP / propane gas... thanx for all the help,installed sv9501 gas valve all ops. OK now thanks again...

Nat gas-Lo 1"-4"w.c. Hi 2"-5" w.c.
LP- Lo 4.5"-10"w.c Hi- 8"-12" w.c
For 2 stage valves