Hi Ricardo!
Surely feed the entire house and an upper tank, I tell you that the key is at the beginning of the entire network (at the entrance gate to the house), and after the general key of the water company (which is located on the sidewalk).
I deduced that it does not cut because when I close, water still comes out of a tap that is next to the faucet, and also from the kitchen faucet, but I had not taken into account that there could have been water in the auqneu network It is closed.
What do you recommend me to verify then whether it cuts or not?
What I explained above. Close the general stopcock and open a cold water tap as low as possible (bidet or the key next to the general one). Wait a little while to empty the pipe, sometimes it is necessary to open two simultaneously for air to enter, but everything ends up leaving to work quietly.
To enable water again you have to do the same. First open the general one little by little by keeping the faucets open to take out all the air and then closing one by one each one of the ones you have opened. That you have to do in all the cold water tap that come directly from the street. If it comes from the tank it is not necessary. If you have any questions here I am. regards
If you have hot and cold water directly from the tank, you can do it only with the tap that you have close to the general one and water from the kitchen (but hey; that depends on the distribution of the installation)