What is used to seal the nozzle diaphragm and the rotor on an SSTG?

Labyrinth packing is utilized to seal the nozzle diaphragm and rotor on a steam turbine generator (SSTG). This type of sealing mechanism works by creating a series of grooves and barriers that help to restrict the flow of steam or gas, effectively reducing leakage. The design of labyrinth packing allows for minimal contact between moving parts, which helps to lower wear and maintain efficiency.

Unlike O-ring seals, which can become less effective due to wear or extreme operating conditions, labyrinth packing maintains a more robust seal by using the geometry of its design rather than relying solely on material compression. Gasket seals and silicone foam are typically used in other applications where a different type of barrier or cushioning is needed, but they do not provide the same effectiveness in high-pressure steam environments as labyrinth packing does. Thus, labyrinth packing is the most appropriate choice for sealing in the context of an SSTG.