Shalom Hakham,
Is it permissible to shut off a gas grill on Yom Tob by shutting the intake valve? Are there any issues?
By Yosef Lopez
Akiba Gali 
Danielle Prizament 
fito Jamous One thought on “Turning off a Gas (propane) Grill on Yom Tob”
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Not a problem. Exactly as you thought.
You can do that on Shabbat too. (As long as it does not increase the flame at all as you do it)