... 1. Design and manufacture according to JIS B2074 B2084. 2. Disc is swivel and lifting, available to install it at port condition ... vertical pipeline. 3. Shaft and hinge pin follows internal structure to reduce outside leakage. 4. Body, bonnet is bolted. Under ... high pressure (PN≥10MPa), middle flange adopts pressure sealed structure to make small product bulk, light weight, reliable sealing. Design ...