本文件规定了必要的耐久性测试，以确认手动塑料阀门承受长时间使用（重复打开和关闭）的能力。它没有规定阀承受不利条件的能力，特别是化学侵蚀性流体介质和/或环境的能力，或过高的流体速度和气蚀。 注关于材料的化学侵蚀性，ISO/TR 10358[1]中报告了分类表。 本文件包括耐久性试验正常性能所需的参数值，但在特定产品标准中参数不同（见5.1）。

This document specifies the endurance test necessary to confirm the ability of hand-operated plastics valves to withstand prolonged use, with repeated opening and closure. It does not specify the ability of valves to withstand adverse conditions, in particular those of chemically aggressive fluid media and/or environments, or excessive fluid velocities and cavitation. NOTE Concerning the chemical aggression of the materials, a classification table is reported in ISO/TR 10358^[1]. This document includes values of the parameters necessary for the proper performance of the endurance test, with the reservation that the parameters are different in particular product standards (see 5.1).