Backflow preventer and relief valve assembly
作者： Ray Sutherland
DOI:
关键词:
摘要: A backflow prevention assembly designed for connection between a main supply line and service pipe in water service, comprising two check valves series relief valve draining the chamber under certain operating conditions.
lens.org 参考文章(5)
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Carlton Frank, Leonard L Snyder, Back siphonage prevention, antibackflow, and vacuum breaking valve ,(1943)
William S Grau, Miles M Chard, Fred K Wyckoff, Donald G Griswold, Backflow prevention device ,(1961)
Charles C Seger, Low flow valve ,(1964)