Which of the following is not shown in a hydraulic schematic?

In hydraulic schematics, the depiction of components is important for understanding the flow and control of hydraulic fluid within a system. While hydraulic schematics include symbols and representations for critical components such as pumps, actuators, and relief valves, they typically do not represent the liquid itself in a direct manner.

The purpose of a hydraulic schematic is to illustrate the components, connections, and flow paths within a hydraulic system clearly. Symbols are used to represent the different parts, which makes it easier to follow the system's operation without needing to show every tangible aspect of the fluids being used. Essentially, the hydraulic fluid is implied as a medium that moves through those components, but it isn't represented as a physical element in the schematic itself. This abstraction allows for a cleaner and more efficient representation of how the system functions.

Thus, the correct response underscores the fact that while components that interact with the hydraulic liquid are shown, the liquid itself is not included as part of the schematic drawing.