1.1 本规范涵盖与符合规范的管道和管材一起使用的配件、附件和阀门 D1785 , D2241 , D2846/D2846M , F441/F441M or F442/F442M 或配件制造商规定的其他管道。这些产品，如接头、法兰或阀门，不包括在现有ASTM规范的范围内。本规范包括测试、材料、尺寸、工艺、标记和厂内质量控制的最低要求。 1.2 本说明书所涵盖的配件或附件通常由模制或机加工部件模制、制造或组装而成。部件中使用的材料包括刚性热塑性塑料、热塑性弹性体、弹性体和金属。配件、附件或阀的主体或主要部分通常是PVC、CPVC、PE或PA(尼龙)。本标准涵盖的所有产品旨在用于PVC或CPVC塑料管道系统，或作为从这些系统到金属系统的过渡。 1.3 这些产品在气体服务中的应用超出了本规范的范围。 1.4 本规范涵盖的产品仅用于分配与管道材料化学相容的加压液体。由于与用压缩空气或其他压缩气体测试部件和系统相关的固有危险，一些制造商不允许对其产品进行气动测试。在进行气动测试之前，请咨询特定的产品/部件制造商，了解其特定的测试程序。 附注1: 警告: 加压（压缩）空气或其他压缩气体包含大量储存的能量，这些能量存在严重的安全性，如果系统由于任何原因发生故障，这些能量存在严重的安全隐患。1.5 依靠热熔焊连接到管道系统的配件超出了本规范的范围。 1.6 本规范涵盖的止回阀（包括底阀）不应被视为防回流装置，也不应用于保护饮用水供应。有关防回流装置的定义和要求，请参考型号管道规范和ASSE。 2 1.7 由于围绕耐化学性和腐蚀性的复杂和特定于安装的问题，本规范没有解决产品与所有可能的最终使用环境的兼容性。如果系统输送饮用水以外的液体，建议针对最终使用环境进行额外测试。 1.8 以英寸表示的值-英镑单位应被视为标准单位。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。 1.9 以下安全警告仅适用于本质量标准章节的试验方法和厂内质量控制部分: 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers fittings, appurtenances and valves which are to be used with pipe and tubing complying with Specifications D1785 , D2241 , D2846/D2846M , F441/F441M or F442/F442M , or other piping as specified by the fittings manufacturer. These products, such as unions, flanges or valves, are not included in the scope of existing ASTM specifications. This specification includes minimum requirements for testing, materials, dimensions, workmanship, marking, and in-plant quality control. 1.2 Fittings or appurtenances covered by this specification are generally either molded, fabricated, or assembled from molded or machined components. The materials used in components include rigid thermoplastics, thermoplastic elastomers, elastomerics, and metals. The body or main portion of the fitting, appurtenance or valve is typically PVC, CPVC, PE or PA (nylon). All products covered by this standard are intended to be used in PVC or CPVC plastic piping systems, or as a transition from these to metal systems. 1.3 The application of these products to gas service is beyond the scope of this specification. 1.4 The products covered by this specification are intended for use with the distribution of pressurized liquids only, which are chemically compatible with the piping materials. Due to inherent hazards associated with testing components and systems with compressed air or other compressed gases some manufacturers do not allow pneumatic testing of their products. Consult with specific product/component manufacturers for their specific testing procedures prior to pneumatic testing. Note 1: Warning: Pressurized (compressed) air or other compressed gases contain large amounts of stored energy which present serious safety which present serious safety hazards should a system fail for any reason. 1.5 Fittings which rely on heat fusion welding for connection to the piping system are outside the scope of this specification. 1.6 Check valves (including foot valves) covered by this specification shall not be considered backflow prevention devices and shall not be used for the protection of a potable water supply. For definitions and requirements of backflow prevention devices, consult model plumbing codes and ASSE. 2 1.7 Due to the complex and installation-specific concerns surrounding chemical resistance and corrosion, this specification does not address the compatibility of the products with all possible end-use environments. Additional testing specific to the end-use environment is recommended if the system is conveying liquids other than potable water. 1.8 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.9 The following safety caveat applies only to the test methods and in-plant quality control portions, section of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.