The science pros at The King of Random show how to make a budget-friendly one-way check valve that works.

The video is then rounded out with a simple plastic check valve design you can print at home. It reminds us of other valves we’ve seen created with 3D printing before. Video after the break.

A common metering device used on new walk-in cooler/freezers today is the electronic expansion valve (EEV). It allows for a tighter control of a refrigerant’s superheat value leaving the evaporator ...