China Cast Steel Gate Valve: ASME B16.34, API 600 Cast Steel Gate Valves, OS&Y, Rising Stem, Bolted/Pressure Seal Bonnet, BW ... , 150LB-2500LB, 2-48 Inch. Features: OS&Y, Rising Stem. Bolted Bonnet/Pressure Seal Bonnet. Flexible Wedge. Extended Bonnet for ...