超清版 GB/T 44574-2024 建筑排水管道系统防污染用塑料止回阀

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
2024-09-29 发布2025-04-01 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 ·························································