Flaps perform essential jobs. From pumping hearts to revving engines, flaps help fluid flow in one direction. Without them, keeping liquids going in the right direction is challenging to do.

A 3D image of the spiral-shaped intestine of a Pacific spiny dogfish shark. In life, food would move through this intestine left to right. Samantha Leigh / California State University, Dominguez Hills ...

The Kynar (PVDF) one-way stopcock valve is for use in harsh elements of chemical analysis and meets clean-room and sanitary requirements for food processing and potable water. The valve is available ...

Researchers have discovered a new way to help liquid flow in only one direction, but without using the flaps that engines and our circulatory system rely upon to prevent fluid backup. The team created ...