Check Valve with no moving parts

[HopCar]

I wonder if this could have marine applications, maybe in bilge pump discharge?

Bioinspired one-way-flow pipes handle liquid like sharks digest food

Ordinarily, if you want liquid to flow in only one direction through a pipe, that pipe needs to be equipped with a flap-type valve – which could fail. Now, however, scientists have created a new type of potentially more robust one-way-flow pipe, which was inspired by shark intestines.

newatlas.com

 

[Comodave]

Very interesting but I wonder how much it will inhibit water flow. May have to go with a larger size in order to get the flow desired.

 

[Still Boating]

Looks like they wouldn't do well if you had to clear blockage with a stick

 

[OldDan1943]

If you are planning to put on bilge pumps over board, don’t.
They may/will fail at the worse possible time.