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Can you tell me is this a standing pilot furnace? That is, pilot is on all the time. If so, have you tried to replace the thermocouple?
OK, that is the first thing you need to do as thermocouple's should be replaced annually.
The pilot stays on because the thermocouple is marginal in it's output. It's possible the valve could be bad, as well, since this is a very old furnace. But I like to start simple and since I know thermocouples should be replaced every year, I'd like to start with that. You actually should be able to pick up a comparable thermocouple at any hardware or home improvement store.
If it doesn't solve it, the next step would be to replace the valve. Since Singer has been out of the furnace business for years, you will not be able to get the original part, so we will have to find a generic valve that will work in your situation. This question (and chat) remain open, so feel free to post back when ever you want.
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