Tesla valve - GIF

Tesla valve.

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Previously:

Ball valve animation - GIF
Iris valves - GIFs
Large double disc gate valve - photo
Machining brass valves - video
NACA 11-foot valve installation - photo
Valve facing machine - video
World's largest gate valve - video

From Wikipedia: A Tesla valve, called a valvular conduit by its inventor, 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.