When turned open, the disc of the gate is completely removed allowing materials to pass. even though this gives the valve good shut-off property and bidirectional, they cannot be quickly open or close and are responsive to shaking when open. When turned open, the disc of the gate is completely removed allowing materials to pass. This gives the gate valve good shut-off property and allows it a bidirectional movement. They cannot be quickly blocked or unblocked. The Gate Valves shakes when it is blocked.