We all know that The Conjuring is a true story or a movie that is based on a real paranormal event. While it’s true that the Warrens did inspect Amityville, and it’s true that they spend a few days consulting the actual investigators of the Enfield Poltergeist, and neither of these cases has anything to do with Valak in real life. Also, many people are really confused on why was this demon was dressed like a nun?
In demonology, Valac is the mighty Great President of Hell, having thirty (thirty-eight to other authors) legions of demons under his command. Valac is said to give true answers about hidden treasures; he reveals where serpents can be seen, and delivers them harmless to the magician. He is said to appear as a small poor boy with angel wings riding on a two-headed dragon. (source)
The demon featured in the movie the Conjuring 2 even though Warren’s state the name is Valak, we think that the demon showed a closer similarity to Beelzebub, the demon of lies.
Here's a video of the true story of The Conjuring 2 and what really happened to the Perron Family.
Credits to: Youtube