热塑性塑料阀门

[中文适用范围]： 本文件规定了测定热塑性塑料阀门开启、关闭和运行扭矩的试验方法。本文件适用于用于流体输送的所有类型的手动操作热塑性塑料阀门，无论是否带执行器。注 1：用此方法测试的阀门类型示例见 ISO 4437-4、ISO 16135、ISO 16136、ISO 16138。本文件未规定在特定工作条件下长时间使用阀门或材料磨损/化学侵蚀后扭矩与扭矩可能增加之间的关系。注 2：关于材料的化学侵蚀，ISO/TR 10358 中报告了一组数据，涉及耐久性试验，该试验是确认手动塑料阀门经受长时间重复开启和关闭操作的能力所必需的。ISO 8659 中提供了更多信息。 [外文原描述]： This document specifies a test method for the determination of the opening, closing and running torque of thermoplastics valves. This document is applicable to all types of manually operable thermoplastics valves, with or without actuator, intended to be used for the transport of fluids. NOTE 1 Examples of valve types tested with this method are in ISO 4437-4, ISO 16135, ISO 16136, ISO 16138, ISO 16139, ISO 16486-4, ISO 21787, EN 1555-4 [ 13 ] and EN 12201-4 [ 14 ] . This document does not specify the relationship between the torque and its possible increase after prolonged use of the valve under a specific working condition or wear/chemical aggression of the materials. NOTE 2 Concerning the chemical aggression of the materials, a collection of data is reported in ISO/TR 10358 concerning the endurance test necessary to confirm the ability of hand-operated plastics valves to withstand prolonged use with repeated opening and closing operations. Further information is provided in ISO 8659.