... , dual parallel joist structure, Min. flow obstruction, vibration-free even under high flow rate, save energy.** Stainless steel seat ... Unique taper pin, US patent design pin, bolt free & clearance free connection, eccentric pin maintains strength of shaft, large ... sealing effect** complies with BS 6755, part1, 1986. Valve sizeDN50-DN600Pressure rating PN10/PN16Body pressure1.5/2.4MPaSeat pressure1 ...