Valves and Cryogenic Components

The regulating and shut-off valves are divided into various product lines according to application. The most important differentiation features are the fluid and/or the application, the operating pressure or the execution of the dynamic spindle seal. The product portfolio covers a wide range, for temperatures close to absolute zero (cryogenic bellows valves) or for pressures up to 1,000 bar (high-pressure valves).

Check valves prevent the unwanted return flow of fluids and help to make processes safe. The valves are for cold applications and are thus available in a vacuum box for welding in, but are also available in a warm design, such as for use in helium recovery systems.

Cryogenic safety valves are used in applications in which system overpressure in a cryogenic system is not only an extraordinary emergency but may very well occur several times. In this regard, it should be possible to collect and reuse the cryogenic, vaporising fluid - typically helium - for efficiency and cost reasons. This happens in the cryogenic state; therefore, the valves possess a vacuum weld-in flange for integration into a vacuum box.

The Johnston couplings (also called bayonet couplings) enable a separable connection between a vacuum box or a vacuum container and a flexible transfer line. The couplings have one or two fluid lines and are vacuum-insulated.

Ejectors are used to increase the efficiency of a liquefaction or refrigeration system. An ejector possesses no moving parts and is therefore maintenance-free and designed to increase the efficiency in vacuum-insulated systems.