A sluice valve is a type of valve that regulates or controls the flow of fluids in a pipeline. Some synonyms for this term are gate valve, knife gate valve, or slide gate valve. A gate valve is a valve that uses a gate or disc to stop or start the flow of fluid, and is often used in isolation applications such as in pipelines, waterways, and dams. A knife gate valve is a type of valve that uses a sharp edge to cut through materials like slurries and powders, and is often used in wastewater treatment plants or mining applications. A slide gate valve, on the other hand, uses a slide mechanism to control the flow of fluid in pipes, and is common in industrial piping systems.