Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Is a hissing sound the only indication that the pot is up to pressure? Shouldn't the valve rise? Mine didn't.
Document: The T-Fal, and presumably other models with a variable valve, produces no sound of a jiggling weight, just a slight hiss and visible steam off the top pressure control valve. This reviewer likes the quiet, although some users might be reassured and reminded that something is cooking at pressure with the sound of a jiggling weight. At 15 psi, for the set weight and the max pressure allowed on the T-Fal, cooking times are exactly the same.
We have used this pressure cooker multiple times per week without issue for over a month now. It has worked well without any problem. It seals well. I particularly appreciate that the handle remains relatively cool to the touch. The pressure release valve lets the steam out with a mild sound but not the annoying whistle of one of my old pressure cookers. And finally, I appreciate that this is a stainless steel pressure cooker instead of aluminum as some brands are.
(Out of curiosity, I went to the website today and found a whole bunch of "Temporarily out of stock" notations for numerous T-Fal pressure cooker models. For some, the only available part was a sealing ring - not the safety valve, nor - for electric - the pot, cord, or condensation collector.
Adding herbs seems to infuse both beans and meat with their flavor.The pressure cooker saves on electricity with my electric stove because once I get the pot up to pressure, I can turn the heat way way down and it will still hold the pressure. When releasing the pressure when you're done, be sure to stand back from the pressure valve. The steam is hot and it comes out fast at first.
I used it 4 times since and its gradual and operates as expected each time, so I think this was to somehow set it up. Either that or the valve was just stuck and some overpressure got it unstuck. Its still a good idea to do this to get familiar with it before actually trying to cook something.- The pressure indication pin is located in the hole on the handle and will not allow the unit to pressurize unless you have the latch locked.
Foods you cook in pressure cookers tend to be healthier than just cooking them in a pot, because they keep more of their nutrients because of the reduced cooking time.
One of mine did, but I tried it anyway and it pushed the yolk out through the crack and it cooked to the outside of the shell! It was quite artistic, but not something I would eat.... haha! You should be able to fit a dozen eggs in the included basket, cook for 5-6 minutes and do a natural release. Back to more pressure cooking adventures!
This is the second pressure cooker I've owned. The size is perfect for 2 people. It makes perfect pinto beans in just less than an hour, and perfect  potatoes for mashing in 10 minutes. Cleanup is easy and the finish of the pot stays beautiful. A very good value.
If you have cooked with a pressure cooker before, as I have, you will find this T-Fal pressure cooker to be easy to use. If you have not used one before, do not be intimidated by the product and give it a try. In either case, be smart and read the instruction booklet before you use this cooker, including the first time trial with only water in the pot. T-Fal includes clear instructions with each part labeled A, B, C, etc.
I like this pressure cooker because you don't have to look for the valve. It locks easily and works great.
Answer: The valve should rise once it reaches the high temperature. You should hear a hissing first and not much later the valve rises.