This standard covers ductile iron gate valves with flanged ends@ in sizes NPS 1 ? through 24@ corresponding to nominal pipe sizes in ANSI B36.10. This standard covers valves in Classes 150 and 300@ as specified in ANSI B16.42. The vales covered are the outside screw-and-yoke (OSY) type@ with a rising stem@ nonrising hand wheel@ bolted bonnet@ and various types of gates (see API Standard 600@ 2.3). Valves covered by this standard shall conform to the applicable requirements for flanged valves of corresponding size and class in API Standard 600@ except as modified herein. The standard nomenclature for valve parts.