Product review (5 stars): Perfect fit for my whirlpool range/oven, but did not solve my problem
This gas valve was a perfect replacement for my whirlpool range/oven (GFG461LVS2). However, it turned out that replacing this part didn't contribute toward solving my problem at all.  No fault of the part, which was perfect, hence the 5 star rating.

To hep others that might encounter the same symptoms, I'm posting my experience here:
My symptoms:
Oven bake operation worked for about 20 minutes or so with proper ignition and flame. After 20 minutes, the oven bake flame would ignite and then immediately go out. The oven attempts ignition 3 times with this result (immediatily shutting down the flame automatically), then gives up using the bake flame and locks it off. The lockout can be reset by pressing the stop button. No other indication is given on the display when the lockout occurrs, so it looks as if your oven is still operating normally, even though it is slowly cooling down. You might not notice it until you go to remove the roast/brisket/turkey/etc. from the oven a couple hours later and find that the oven is cold...

Attempted fixes:
Based on the sound of the oven attempting to bake (3 attempts, with quick shutoff of the gas after each attempt), I thought the ignitor perhaps wasn't igniting the flame properly, so I purchased a new spark ignitor. This is a reasonable first attempt since ignitors tend to take the brunt of wear in the oven and are cheap and easy to replace. However, this did not fix the problem or change the symptoms.

If I had opened the floor of the oven and observed the flame, I would have noticed that the flame was igniting fine (sometimes took 2 attempts, but flame worked). The problem is that the oven shuts off the gas after the flame starts. My next guess, based on further research on the internet, was to replace the gas regulator valve (this product, which is the next cheapest part), which I did. That also did not fix or change the symptoms.

After further research and this new evidence, I discovered that the problem must be in the part of the system that detects that there is a flame. If the oven does not detect a flame, it shuts off the gas valve. In my range/oven (GFG461LVS2), this flame detection happens through the spark ignitor. Since I had replaced the ignitor (this product) already, I trusted it was good. The next possible cause of the problem must be the circuit board that operates the ignitor, which also detects the flame through the ignitor circuit.

I finally replaced the spark ignition module circuit board (part 9758080) and that solved the problem. This circuit board can have failures that produce the symptom of failing to detect a flame after the oven warms up (which also warms the circuit board).

If you are having the symptoms I had (oven works 20-ish minutes, then fails to properly detect the flame, even though flame is ignited properly), then I recommend buying a new ignitor (could be the flame sense thermocouple in the ignitor), then replace the spark control momdule if that doesn't fix it. Don't waste time/money on the valve for this particular symptom.

Another note: Even replacing all three parts as I did (ignitor, valve, circuit board) is still cheaper than a new comparable range/oven purchase, so it is economical if you don't mind putting your own time into the replacement. Also, the parts are not too difficult to replace with medium home-handy-man skills (I'm not a professional repair person) and average tools.