Gate valve with disk replacement structure

A gate valve having a disk replacement structure and disposed in a piping, the gate valve comprising:

• a valve body including a blocking space formed therein, a pair of flange pipes provided to communicate with the blocking space, and a cover coupled to an upper portion of the valve body to close the blocking space;
• a disk provided to be lifted up and down in the blocking space and including a coupling hole in an upper portion of which a lifting nut is disposed;
• and
• an operating rod disposed in the cover and configured to move the disk up and down,
• wherein the cover is provided with an insertion hole to penetrate through the cover, and the operating rod is rotatably disposed in the insertion hole,
• wherein the valve body is provided with a fixing member configured to support and fix the disk,
• wherein the disk is provided with engaging grooves having an upper inclined surface and a lower inclined surface on both side surfaces or front and rear surfaces to be pressed and fixed by the fixing member, and
• wherein a jaw part is formed on an upper side of the blocking space to protrude inward and
• wherein a hermetic protrusion configured to press the jaw part so as to maintain airtightness of the blocking space is formed in the upper portion of the disk.