Backflow prevention apparatus
作者： Richard E. Veit , David E. Griswold
DOI:
关键词: Geology 、 Backflow 、 Mechanical engineering 、 Atmosphere (unit) 、 Control valves 、 Mechanics 、 Relief valve 、 Butterfly valve 、 Check valve 、 Upstream (networking) 、 Differential pressure
摘要: Two identical check valves assemblies are connected in series with a zone between them. A differential control valve vents this to atmosphere whenever the downstream pressure approaches upstream within predetermined magnitude. The action of is responsive across valve.
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