Rated relieving capacity: The flow capacity of a relief device expressed in terms of air flow at standard conditions ( SCFH or Nm3/h) at a designated pressure or vacuum.
额定泄放量：在设计压力或设计真空下，用标准状况下的气体体积表示的泄压设施的体积流量。
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It is rated for vacuum service as well as potentially explosive atmospheres.