oblatejm1-
First off, welcome to iRV2!
Re: Oven. As far as I know, there is no valve to control propane flow to the oven other than the one on the front of the stovetop, with the ones that control gas to the stovetop burners.
There is (almost always) a manual valve at the propane tank; it controls propane flow to all the propane appliances (usually stove/oven, water heater and refrigerator). So, please describe the problem you are having, so we might better know how to help you.
Lastly, you should add a "signature" to your profile. It contains whatever info you want; most people put info about their coach there, so they don't have to type it into each message. Instructions for adding a signature are
here.