标准编号：ISO 13693-2:2015
中文名称：灌溉设备 化学灌溉用安全装置 第1部分：DN 75 （3”） ~ DN 350 （14”）化学灌溉阀组件
英文名称：Irrigation equipment — Safety devices for chemigation — Part 2: Chemigation valve assemblies from DN 75 (3") to DN 350 (14")
发布日期：2015-02
标准范围
This part of ISO 13693 specifies the construction and performance requirement and test methods formetal-bodied chemigation valves with water at temperatures not exceeding 50 °C, which might containfertilizers and chemicals of the types and concentration used in agriculture.The valve is designed to prohibit backflow caused by either back pressure or back siphonage. It isnot designed for use in potable water systems. It is not to be confused with other forms of backflowprevention devices including pressure vacuum breakers, double check valves, reduced pressure zonevalves, or goose neck loops. This part of ISO 13693 specifies the minimum design, construction, andperformance testing requirements for the chemigation valve assembly. The assembly consists of thefollowing components:— a valve body into which a spring-loaded check valve is mounted with a resilient disk cover on thesealing surface;— a combination air release/vacuum relief valve located upstream of the check valve;— a low pressure drain valve located upstream of the check valve;— an inspection port located so as to permit visual and manual inspection of the valve working components.
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