A knife gate valve is a specific design of a valve that uses a knife edge that can enter the flow stream and, if necessary, use the edge of the gate to separate any materials that might prevent the valve from sealing completely.

Knife gate valves are used in wastewater treatment plants to control the flow of wastewater. They can handle high-solid content materials, which makes them ideal for use in this application. Knife gate valves are used in pulp and paper mills to control the flow of pulp and other materials.

The working principle of a knife gate valve is based on the movement of the valve disc to control the flow of fluid. They are widely used in industrial applications due to their reliability and sealing performance, especially in situations where rapid shutoff of fluid flow is needed.