vacseal真空密封膠視頻
NonRisingStemVAC真空VacuumCV止回閥CheckValveOD外徑OutsideDiameterVOL提及，容量VolumeCWP冷水工作波紋管密封式bellowssealtype用波紋管作閥桿主要密封的各種閥門波紋管平衡式安全閥bellowssealbalan...
NonRisingStemVAC真空VacuumCV止回閥CheckValveOD外徑OutsideDiameterVOL提及，容量VolumeCWP冷水工作波紋管密封式bellowssealtype用波紋管作閥桿主要密封的各種閥門波紋管平衡式安全閥bellowssealbalan...