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chemisthypnos
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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...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?
A hydrogen car fuel tank is a specialized tank that stores and holds hydrogen gas, which is used as a fuel source for hydrogen-powered vehicles.
A hydrogen car fuel tank is made of materials that are impermeable to hydrogen gas, such as carbon fiber or aluminum. These materials have very low permeability, meaning they do not allow hydrogen molecules to pass through and escape the tank.
Preventing permeation is important because hydrogen gas is highly flammable and can be dangerous if it leaks out of the fuel tank. By using impermeable materials, the risk of a hydrogen leak is significantly reduced.
A valve check is a safety measure that is built into a hydrogen car fuel tank. It is a one-way valve that allows excess pressure to escape from the tank, but prevents oxygen from entering. This helps to prevent explosions or fires.
A valve check should be performed regularly, typically every 6-12 months, to ensure that it is functioning properly. It is also important to have the tank inspected by a qualified technician to check for any signs of damage or wear and tear.