A gate valve, sometimes referred to as a sluice valve, is a valve that uses a gate or wedge to control the flow of fluid. Unlike many other types of valves, it does not regulate flow, but rather acts as an on/off switch. Let’s explore the intricacies of the gate valve. It is a plumbing product that controls the fluid flow through pipes. Imagine you have a pipe that carries water and want to control when the water flows and stops. That’s where a gate valve comes in handy.