范围1。1本标准实施规程涵盖了带阀体/阀盖加长件的不锈钢和其他合金低温工作阀门的材料、设计、尺寸、制造、无损检测和压力测试要求。此外，还涵盖了可能不需要阀体/阀盖加长件的低温应用止回阀的要求。本标准操作规程适用于低温闸阀、截止阀、蝶阀、球阀和止回阀，并可与其他阀门一起使用- 具体标准；包括本标准实施规程中确定为母标准的以下内容:ASME B16。34，阀门-法兰、螺纹和焊接端API 600，钢闸阀-法兰和对焊端，螺栓连接阀盖API 602，尺寸NPS 4（DN 100）及以下的石油和天然气工业用钢闸阀、截止阀和止回阀API 603，耐腐蚀，螺栓连接阀盖闸阀-法兰和对焊端SAPI 608，金属球阀-法兰，螺纹和焊接EndsAPI 609蝶阀: API 6D双法兰、凸耳和对夹式管道阀门规范（与ISO 14313相同）1.2本标准实施规程中的要求无意取代或取代母阀门标准的要求。1.3本标准实施规程包括与阀门特别相关的额外结构细节要求，包括低温应用所必需的阀体/阀盖延伸件。

SCOPE1.1 This Standard Practice covers requirements for material, design, dimensions, fabrication, non-destructive examination and pressure testing of stainless steel and other alloy cryogenic service valves with body/bonnet extensions. Requirements for check valves for cryogenic service, which may not require body/bonnet extensions, are also covered. This Standard Practice applies to cryogenic gate, globe, butterfly, ball, and check valves, and may be used in conjunction with other valve-specific standards; including the following identified in this Standard Practice as a parent standard:ASME B16.34, Valves - Flanged, Threaded, and Welding EndAPI 600, Steel Gate Valves - Flanged and Butt-welding Ends, Bolted BonnetsAPI 602, Steel Gate, Globe, and Check Valves for Sizes NPS 4 (DN 100) and Smaller for the Petroleum and Natural Gas IndustriesAPI 603, Corrosion-resistant, Bolted Bonnet Gate Valves - Flanged and Butt-welding EndsAPI 608, Metal Ball Valves - Flanged, Threaded and Welding EndsAPI 609, Butterfly Valves: Double Flanged, Lug- and Wafer-typeAPI 6D, Specification for Pipeline Valves (identical to ISO 14313)1.2 The requirements in this Standard Practice are not intended to supersede or replace requirements of a parent valve standard.1.3 This Standard Practice included additional construction detail requirements specifically related to valves, including body/bonnet extensions essential for cryogenic applications.