关于防火阀的若干问题在英国，通常使用专门的防火装置来防止火沿通风管道穿过防火墙，这些装置包括手复泣型防火阀。此类装置大多安装在人难以靠近的地方，因而在安装后往往得不到检查和维护。同样对于受易熔合金和其它热敏触发装置控制的落帘型防火阀，也不便检验其功能... A number of problems with fire dampers In the United Kingdom, specialized fire protection devices are often used to prevent fire from passing through fire walls along ventilation ducts. These devices include hand-muffled fire dampers. Most of these devices are installed in hard-to-reach places and are often not inspected and maintained after installation. The same for the fusible alloy and other thermal trigger control curtain curtain fire valve, but also to test its function ...