Flexible use of the gate valve packer rubber deformation total compensation package to effect a good seal, valve seal to overcome the generally poor, the phenomenon of water leakage and rust, and more effective to save installation space. Can be widely used for water, sewage, construction, petroleum, chemical, food, pharmaceutical, textile, electric power, shipbuilding, metallurgy, energy systems, fluid lines and the closure as a conditioning device. Flexible seat seal gate valve rod out and have a flexible seat seal gate valve advantages, and can be more visually indicate when the valve opening, open and close quickly and reliably, Guchang used in fire and industrial systems. Usually installed in high position from the ground