What keeps the liquids flowing in the right direction?

The flow of liquids in the right direction is primarily maintained by pressure differences, which create a driving force. In closed systems, such as pipes, pressure gradients cause liquid to move from areas of higher pressure to lower pressure. Additionally, valves and pumps are often used to control and direct flow, ensuring that liquids move through the desired pathways efficiently. Gravity can also play a role, particularly in systems where elevation changes influence flow direction.