Hydrogen is produced by means of the electrolysis of water and can be used as a very efficient fuel for vehicles or for energy supply. Thus, electricity can be stored and used at a later point in time when it is required.
Hydrogen is increasingly cleaned and stored cryogenically. Apart from the higher temperature, a hydrogen liquefier's technology is very similar to that of a helium liquefier. Here, too, utmost attention is paid to the lowest heat losses. WEKA cryogenic valves and cryogenic couplings can thus meet the customer's highest requirements for precision and efficiency.
Gaseous hydrogen is usually stored in high-pressure cylinders which are installed both at the manufacturer's premises and at the user's premises and on road and rail vehicles. For the filling and refilling of the storage cylinders, a very precise control behaviour must be complied with.
For use in the vehicle tank, the pressure is then increased up to 350 or 700 bar. Taking any pressure losses in the line into account, valves up to a nominal pressure of 1000 bar are required. Hydrogen is stored both at ambient temperatures and at cryogenic temperatures at these high pressures. Therefore, the control valves in this area do not only have to demonstrate the tightness required, but must also have the corresponding characteristics for cryogenics.