Yes, that’s where you “could” have a safety check valve (some are just full flow, no flow limiter) and it would do what you described. You open it too fast or there is no back pressure before you open it and it limits the flow. The tanks I often find have this type of connection, it does not look like there is enough room for that fitting to have the flow limiter, I need to ask one of the local propane companies about it:
Most likely it’s just a POL fitting, no check valve:
They are also portable. Still, when placing a 100 -pound propane tank on your property, you must adhere to the following requirements: The minimum distance from the opening of a building is 3 feet. The minimum distance from any source of ignition is 5 feet.
