Hydrogen-powered cars utilize specialized valves to prevent hydrogen permeation during refueling. A common solution involves using a Schrader valve with a ball bearing mechanism that acts as a check valve, ensuring that hydrogen does not escape when the fill hose is removed. However, these valves are not entirely foolproof; incorporating a secondary manual ball valve with its own safety relief valve is advisable. Additionally, manufacturers often use gold plating or super-alloys like Elgiloy to mitigate hydrogen permeation effects on sensors.
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That's a design detail that may vary. I can tell you this though; my large neighborhood propane tanks use a type of Schrader valve using a ball bearing instead of a center post. It acts as a check valve, with the pressure and a spring popping it into place as soon as the fill hose is removed. I see no reason why this wouldn't work for H2...chemisthypnos said:How do hydrogen powered cars prevent the permeation of hydrogen through the valve used to fill the car's tank with hydrogen? Is a regular check valve used or is the valve special in some way?