High-sealing-performance ball valve

The utility model discloses a high-sealing-performance ball valve which comprises a valve seat provided with a flange. The fastening ring is arranged on the threaded part of the flange in a sleeving mode, the supporting ring is arranged on the valve seat in a sleeving mode and abuts against the fastening ring, the folding ring is annularly arranged on the end face of the supporting ring, and protruding points are densely distributed on the inner side of the supporting ring; and the valve cover is sleeved on the valve seat and abuts against the folding ring. The folding ring is supported and protected through the supporting ring, the folding ring is compressed, meanwhile, the fastening ring is in threaded connection with the valve seat, and the further sealing effect is achieved. 本实用新型公开一种高密封性球阀，包括阀座，阀座具有凸缘；套设于凸缘的螺纹部的紧固环，套设于阀座止抵紧固环的支撑环，环设于支撑环端面的折页环，支撑环内侧密布凸点；套设于阀座且止抵折页环的阀盖。本实用新型通过支撑环支撑保护折页环，通过压缩折页环，同时紧固圈螺纹连接阀座，起到进一步密封的作用。