The functioning of a control and shut-off valve becomes very demanding if the temperature drops to the range of absolute zero. In these extremely cold temperature ranges, each valve must be designed and optimised according to the application and fluid. In more than 35 years, WEKA has acquired the corresponding knowledge and experience.

A cryogenic valve is one of the few elements which connect the cold pipeline with the liquid gas to the environment at ambient temperature.

This may result in a temperature difference of up to 300°C between the pipeline and the environment.

This temperature difference generates a heat flow from the warm to the cold area, which reduces the efficiency of a system and impairs the proper functioning of the valve under extreme circumstances if ice is formed at the warm end.

The challenge is to reduce the thermal resistance between the warm and the cold area, i.e. between the valve bonnet and the valve connections, as far as possible. WEKA cryogenic valves are characterised by a very low thermal resistance and thus contribute to a system's efficiency.

Since the seventies, the WEKA valves are widely used in helium and hydrogen liquefiers as well as coolers of the most important technology leaders in the industry. They are also used in most plasma physics research facilities all over the world.

Even the infrastructure for the refuelling of space rockets of the European Space Programme uses WEKA valves for helium, hydrogen, oxygen and nitrogen.

A range of needle valves for air gases completes the range of products for applications in air separation units.