What is the working principle of the connecting clamp of Shanghai flat gate valve?

The working principle of the clamp connecting Shanghai flat gate valve is to control the fluid in the pipeline by rotating the valve stem to make the gate move up and down. When the valve is closed, the gate is closely attached to the valve seat to form a good seal to prevent fluid leakage. When the valve is opened, the gate is separated from the valve seat, and the fluid can flow freely in the pipeline.