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 Cryogenic Services. By Pass ...