In a fluid power schematic, which line typically represents a drain line?

In a fluid power schematic, a drain line is often represented as a dashed line. This graphical representation signifies the return path for fluids, indicating where the fluid exits the system or component, specifically for purposes such as hydraulic or pneumatic systems where unwanted fluid must be discharged.

The use of a dashed line helps to distinguish drain lines from the more commonly used solid lines that depict supply or working lines. Dashed lines make it clear that these lines hold a different function within the system and are not part of the main fluid flow. By understanding these conventions, one can effectively interpret and create schematics that communicate system designs clearly.

The answer suggesting "none of the above" does not align with established schematic representation practices commonly used in fluid power systems, as dash lines are indeed employed for this purpose.