Note : Vacuum relief valves are not designed or approved as back-siphonage backflow preventers. For protection against back-siphonage install Watts Series 288A vacuum breakers.

 
  • 注意:蒸汽安全阀不适用于、也不被认可用作倒虹吸防倒流装置。如果需要对于倒虹吸现象提供保护,则需要安装美国瓦茨系列288A真空断路阀。
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