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石墨金属缠绕垫片耐高温高压带内环外环阀门法兰密封垫石墨复合垫
cy石墨填料环阀门自密封环盘根密封圈柔性石墨密封圈耐高温石墨垫环
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阀门用密封圈高温高压自密封环v形石墨填料鑫昌密封
厂家批发石墨环 自密封石墨环 石墨填料环 阀门密封