Die for manufacturing polytetrafluoroethylene liners on small plug valves

The utility model relates to a die for manufacturing polytetrafluoroethylene liners on small plug valves. The die comprises a die barrel, die rings, a core die, a pressing die and an insert, wherein the core die has a frustum shape and sleeved in the die barrel, and an annular gap is formed between the core die and the die barrel; the die rings are arranged in the annular gap in a sealing way; the insert has an annular wedge shape, and is arranged in the annular gap by attaching to the inner wall of the die barrel; and the pressing die is cylindrical, is arranged in the annular gap in a way of moving up and down, and is positioned above the insert. The die directly performs compression molding to manufacture small polytetrafluoroethylene (PTFE) liner products having consistent wall thickness and inclined inner and outer walls. According to the size of a plug shaft of the plug valve, the interior size of the products is fitted with the overall dimension of the plug shaft, the inclination of cones is 2 degrees,