Gate valve

The utility model relates to a gate valve, which comprises the following components: a valve body, a valve cove, the valve rod, the packing box, gland, the flashboard, and handle, valve body upper portion seal installation valve gap, valve gap upper portion flange joint gland, the vertical flashboard that sets up in the valve body, flashboard and valve rod fixed connection, the valve rod is the coaxial valve gap that passes in proper order upwards, gland, bottom surface middle part system has a radial bulge loop under the valve body, coaxial coating rubber sealing layer on the bulge loop, there is a recess at flashboard lower extreme face diameter to the system, the valve body is closed, bulge loop coaxial sealing inlays the dress in the recess of flashboard. The application provides a gate valve has the half -turn bulge loop in valve body bottom system, and the bottom surface is provided with the axial notch under the flashboard, work as the fluid passage, in the time of need closing the valve, the below fla