DIN EN 1514-3
法兰及其连接 - PN标识法兰垫片尺寸 - 第3部分:非金属PTFE包覆垫片
Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 3: Non-metallic PTFE envelope gaskets
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Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 3: Non-metallic PTFE envelope gaskets