GB/T 18693-2002 in English

《GB/T 18693-2002农业灌溉设备 浮子式进排气阀》由TC201（全国农业机械标准化技术委员会）归口，TC201SC4（全国农业机械标准化技术委员会排灌设备和系统分会）执行，主管部门为中国机械工业联合会。
本标准规定了浮子式进排气阀的结构、技术要求和试验方法。该阀门用于含有湿度不超过60℃的水，并且水中可能含有灌溉常用的某些类型和浓度的化学物质的灌溉系统。本标准适用于公称尺寸为15～150mm的浮子作密封件或浮子直接作用于密封件的进排气阀。本标准适用于可使用大气中的空气进入管道系统和/或可将管道中的空气排放到大气中的进排气阀。

Scope

This standard specifies the structure, technical requirements and test methods of the float type intake and exhaust valves (hereinafter referred to as intake and exhaust valves). This valve is used in irrigation systems containing water at a temperature not exceeding 60°C and which may contain certain types and concentrations of chemicals commonly used for irrigation. This standard applies to the inlet and exhaust valves where the float with a nominal size of 15-150mm is used as a seal or the float directly acts on the seal. This standard applies to intake and exhaust valves that allow atmospheric air to enter the piping system and/or discharge air from the piping to the atmosphere.