单管系统 one pipe system; one-pipe system; single main distribution; single main system; single pipe system; single pipe sytem; single-main distribution 单立管系统 single stack system; single-stack system .
A new type of control valve for singlepipesystem is introduced.
介绍了一种适用于单管系统的新型调节阀。
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This paper analyzes air source in heating system, states that gas is harmful in the system, points out level pipe gradient being small in single measure system, and velocity of flow must keep great.