Requirements: Valve must be tight against reverse flow under all pressure differentials.
要求：在所有压差下，阀门对于回流必须是密封的。
Filtration operation is in constant pressure differentials, called the constant pressure filter.
过滤操作是在恒定的压差下进行，称为恒压过滤。
Dynamic variations of the fertilizer solution concentration of outlet of pressure differential tank were tested under different pressure differentials and fertilizers amounts.
该文对不同施肥量和压差条件下施肥罐出口肥料溶液浓度的动态变化进行了测试和分析。
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