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建筑排水管道系统防污染用塑料止回阀 Plastic check valves for anti-pollution for discharge piping systems inside buildings ICS 83.140.30 CCS G 33 中华人民共和国国家标准 GB/T 44574—2024 2024-09-2 9发布 2025-04-0 1实施 国家市场监督管理总局 国家标准化管理委员会 发 布 目 次 前言 ····································································································· Ⅲ 1 范围 ·································································································· 1 2 规范性引用文件 ······················································································ 1 3 术语和定义、符号和缩略语 ·········································································· 1 3.1 术语和定义 ······················································································ 1 3.2 符号和缩略语 ···················································································· 2 4 材料 ·································································································· 2 5 设计 ·································································································· 3 6 要求 ·································································································· 3 6.1 外观 ······························································································ 3 6.2 颜色 ······························································································ 3 6.3 规格尺寸 ························································································· 3 6.4 性能要求 ························································································· 4 6.5 铅限量 ··························································································· 5 7 试验方法 ······························································································ 5 7.1 状态调节 ························································································· 5 7.2 外观和颜色 ······················································································ 5 7.3 尺寸 ······························································································ 5 7.4 密度 ······························································································ 5 7.5 维卡软化温度 ···················································································· 5 7.6 熔体质量流动速率变化率 ········································································ 5 7.7 氧化诱导时间 ···················································································· 6 7.8 烘箱试验 ························································································· 6 7.9 坠落试验 ························································································· 6 7.10 流通能力 ························································································ 6 7.11 水密性 ·························································································· 6 7.12 铅限量 ·························································································· 6 8 检验规则 ······························································································ 7 8.1 检验分类 ························································································· 7 8.2 组批和分组 ······················································································ 7 8.3 出厂检验 ························································································· 7 8.4 型式检验 ························································································· 8 8.5 判定规则 ························································································· 8 9 标志、包装、运输、贮存 ···························
GB-T 44574-2024 建筑排水管道系统防污染用塑料止回阀
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