GB/T 18691.2-2011 in English

《GB/T 18691.2-2011农业灌溉设备 灌溉阀 第2部分：隔离阀》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。

Scope

This part of GB/T 18691 specifies the design requirements, performance requirements, conformity assessment, marking and packaging of isolation valves. This section applies to irrigation systems where the water temperature does not exceed 60°C and the water may contain certain types and concentrations of fertilizers or chemicals commonly used in agriculture. This part applies to hydraulically driven irrigation isolation valves with a nominal size not less than DN8. The isolation valve is designed to work in fully open and fully closed states, but it can also work in any intermediate state for a long time.