A Tesla Valve, originally called Tesla's Valvular Conduit, is a fixed-geometry passive Check valve. It allows a fluid to flow preferentially in one direction, without moving parts. The device is named after Nikola Tesla, who was awarded a patent in 1920 for its invention.
The Tesla Valve is used in microfluidic applications, and offers advantages such as scalability, durability, and ease of fabrication in a variety of materials.
A Tesla Valve offers resistance 10-200 times greater in one direction compared to the other, in which the flow is turbulent. Based on CFD analysis of a 4 segment valve, the resistance in the blocking direction was 15 times greater than the unimpeded direction, evidence suggests that a pressure ratio of 200 could be achieved.