A question about furnace gas valve replacement [View all]

The valve on my relative's furnace failed. They got in touch with a reliable repair service, and a rep replaced the gas valve today. I went over to meet the rep and let him in, and after that, stayed for about an hour, then came home.

My question is, are there any risks after a gas valve is replaced? The people are out and about, but the pets are in the house. I have an anxiety disorder, and of course, I'm worried that I left in case the new valve fails. Leak or explosion or things I might not have thought of. Thank you for any insight. I looked online, and there is plenty of information about the old valve failing, but not the replacement