(1), Full size or reduced size design
(2), Three bonnet types: bolted, welded, self-sealing
(3), sealing surface is not easy to wear, abrasion, good sealing performance, long life
(4), compact structure, good opening and closing, small height, convenient maintenance.
(5), Inverted sealing of the body
(6), Simple in shape, short face-to-face length, good technic in producing, and widely applied