Hydrogen Car Fuel Tank

  • #1

Main Question or Discussion Point

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?
 

Answers and Replies

  • #2
russ_watters
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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?
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...

...but these valves are not foolproof and a secondary manual ball valve would be a good idea....though it would also need it's own safety relief valve.
 
  • #3
That is true for most compounds, but hydrogen is very hard to contain as it goes through the walls of most materials through permeation.
 
  • #4
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  • #5
Ok. Thanks everyone.
 

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