MSS SP-155-2018规定了主要用于输送腐蚀性流体的工厂制造塑料内衬金属阀门的要求和标准。首选衬里材料在附表中列出，不包括聚氨酯和聚氨酯衬里材料。本标准操作规程适用于球阀、止回阀、旋塞阀、蝶阀和类似的四分之一回转阀。它不适用于隔膜或塑料衬里刀闸阀。本标准实施规程包括材料、工艺、尺寸、设计、制造、工作压力和温度、试验方法、鉴定要求和标记要求。本标准实施规程未定义不同衬里材料对各种化学和操作环境的适用性，也未涉及塑料涂层产品。

MSS SP-155-2018 establishes requirements and criteria for factory-made plastic-lined metal valves intended primarily for conveying corrosive fluids. Preferred liner materials are listed in an accompanying table and do not include urethane and polyurethane liner materials. This Standard Practice applies to ball, check, plug, butterfly, and similar quarter-turn valves. It does not apply to diaphragm or plastic-lined knife gate valves. Requirements for materials, workmanship, dimensions, design, fabrication, working pressure and temperatures, test methods, qualification requirements, and markings are included within this Standard Practice.This Standard Practice does not define the suitability of different liner materials to various chemical and operating environments and does not involve products coated with plastics.