农业灌溉设备.灌溉阀.第5部分:控制阀

[中文适用范围]： ISO 9635 的这一部分规定了控制阀的结构和性能要求以及测试方法，控制阀适用于水温不超过 60 °C 的灌溉系统，其中可能含有农业中使用的肥料和其他类型和浓度的化学品。 它适用于直径 DN 15（1/2 英寸）或更大的液压控制灌溉阀，设计用于从全开到全关的任何位置操作。 这些阀门可以直接操作（即通过弹簧或隔膜向闭塞器施加力），也可以先导操作（即通过隔膜通过可调节先导阀施加力）。 这些阀门还可以用作止回阀。 [外文原描述]： ISO 9635-5:2014 specifies construction and performance requirements and test methods for control valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 °C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to hydraulically-operated control irrigation valves of DN 15 (1/2 inch) diameter or greater, designed to operate in any position, from fully open to fully closed. The valves can either be directly operated (i.e. the force applied via a spring or diaphragm to the obturator), or pilot-operated (i.e. the force is applied through an adjustable pilot valve via a diaphragm). These valves can also function as check valves.