What type of lines indicate vent lines and drain lines on a hydraulic schematic?

In hydraulic schematics, dashed lines are conventionally used to represent vent lines and drain lines. This distinction is important as it visually differentiates these lines from other types of connections that may carry pressurized fluid or represent mechanical aspects of the hydraulic system.

The use of dashed lines allows for a clear and concise representation, helping readers and technicians to quickly identify less critical or different functions within the hydraulic system. This visual cue reduces confusion when interpreting complex schematics and ensures that maintenance personnel can easily pinpoint where venting and draining processes occur, which is crucial for safe operation and maintenance of hydraulic systems.