Report - EWS 与EWT 型阀门尺寸按IEC 534-8-3计算方法最大约-40 dBA，取决于 ∆P/P 1 比值。详见FirstVueTM 2.0版计算软件 附加技术规格 有关技术规格，如材料、阀座孔直径、阀芯（阀塞）行

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