Flat valves are used in pipeline systems such as natural gas, chemical, and gas pipelines, as well as steam storage equipment. Flat gate valves are equipped with opening and closing devices. Z43 single gate flat gate valve with diversion hole, suitable for long-distance pipelines for natural gas extraction and purification. The sealing structure of the flat valve seat should have elasticity and pre tension, and the upstream and downstream sealing seats should be sealed together. The valve seat and seal always seal face-to-face.