A fluidic diode is a passive device which is has a smaller flow resistance in its preferred direction compared to the opposite direction. The basic concept was patented by Nikola Tesla in 1916. It is based on obstructions which promote more laminar flow in the preferred direction and strong turbulence in the opposite direction. The main advantage of such a device is that these valves have no moving parts and thereby require effectively no maintenance. However, these devices have practically seen no application since their invention.