... 固定管路系统 permanent piping system 消防管路系统 fire main system 液压管路系统 hydraulic plumbing system ...
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它具有较高的密封性能，广泛用于城市给排水管路，是各种水分配系统和消防系统的重要部件。
With good sealing performance and as an important part in water-distribution and fire protection system, this type of valve has widely been used in city's water-supply system and sewerage.
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