👉 Valved, also known as a valve, is a type of mechanical device that allows or restricts the flow of fluid in a pipeline. It functions by opening and closing at specific times to control the flow rate through the pipeline. In the context of valves, there are several types such as: 1. Closed-Loop Valves: These valves allow fluid to flow in one direction only and prevent it from flowing out. For example, a ball valve is a closed-loop valve that allows gas or