These procedures must incorporate adequate purge and evacuation times to allow the valve interior to be properly cleaned.
这些程序必须包括充分的净化和抽空时间，以允许适当清洁阀门内部。
The utility model relates to a multifunctional smoke emission valve which is suitable for the occasions of fire-fighting and smoke evacuation.
本实用新型涉及到一种多功能防排烟阀装置，适用于消防、排烟的场 合。
The utility model relates to a multifunctional smoke emission valve which is suitable for the occasions of fire-fighting and smoke evacuation.
本实用新型涉及到一种多功能防排烟阀装置，适用于消防、排烟的场 合。
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