A gate valve is a type of valve used to control the flow of liquids or gases in a pipeline. It operates by raising or lowering a gate within the valve body, allowing for full flow when open and complete blockage when closed. Gate valves are commonly used in applications where minimal pressure drop and a straight-line flow are essential. These valves are typically made from materials like stainless steel or brass and are designed for durability. They are often found in water supply systems, oil and gas pipelines, and industrial processes, making them a vital component in various engineering applications.