Dark rod elastic seat seal gate valve using structural design, materials, internal parts are gate easy to rust, rubber elastic fatigue easy to aging and other defects, good sealing performance, light operation, simple and convenient maintenance, long service life. Applicable to domestic water system, water supply and drainage system, sewage system, chemical fluid transportation system, etc., in the construction, urban, petrochemical, food, metallurgy, textile, electric power and other industries in the fluid pipeline as a cut-off device.