1.范围1。1本标准实施规程规定了标称管道尺寸（NPS）为1/2至NPS 6的塑料工业球阀的要求，其设计用于分配与管道材料化学相容的加压液体的一般工业系统。它反映了这些阀门的设计、制造和应用的行业实践。1.2本标准实施规程适用于以下类型的两个自润滑阀座上有球密封的阀门:a）真正的活接头球阀所有接头端都有可拆卸的螺母和端部连接器，以便于维修或更换。 这些类型的阀门也称为“双联管”或“双联管”球阀。请参见图1中的示例。b） 单联管球阀只有一个接头端有可拆卸的螺母和端部接头，其他接头与阀体是一体的。请参见图2以获取示例。c） 非活接头球阀所有连接端都是阀体的一部分。请参见图3中的示例。1.3本标准实施规程包括以下要求:a）结构材料b）压力温度额定值和设计要求sc）常用敷设长度尺寸sd）安全特性se）端口尺寸ef）致动器应用要求sg）生产试验sh）标记

1. SCOPE1.1 This Standard Practice establishes requirements for plastic industrial ball valves in nominal pipe sizes (NPS) 1/2 through NPS 6, designed for general industrial systems for the distribution of pressurized liquids that are chemically compatible with the piping material. It reflects the industry practice for the design, manufacture, and application of these valves.1.2 This Standard Practice applies to valves having the ball seal against two self-lubricating seats of the following types:a) True-Union Ball Valves All joint ends have detachable nuts and end connectors so as to facilitate repair or replacement. These types of valves are also known as "double-union" or "dual-union" ball valves. See Figure 1 for illustrative example.b) Single-Union Ball Valves Only one joint end has detachable nut and end connector, with the other joints being integral to the valve body. See Figure 2 for illustrative example.c) Non-Union Ball Valves All joint ends are integral to the valve body. See Figure 3 for illustrative example.1.3 This Standard Practice encompasses the following requirements:a) Materials of Constructionb) Pressure-Temperature Ratings and Design Requirementsc) Commonly Used Laying Length Dimensionsd) Safety Featurese) Port Sizef) Actuator Application Requirementsg) Production Testsh) Markings