压差阀特别适用于分户计量或自动控制系统中。它不需外来能源，依靠被调介质自身压力变化进行自动调节，自动消除管网的剩余压头及压力波动引起的流量变化，恒定用户进出口压差，有助于稳定系统运行。
differential pressure valve 差压阀 ; 压差阀 differential protection valve 差动保护阀 DVIDV Differential ValveDelay Valve 差动阀延迟阀 ..
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压差阀目前应用比较多，我们发现的问题比较特殊，从另一方面看也是一个提醒。
Differential vacuum valve is applied usually, and the question found in application by us is a special question, but if want to use it you should be careful.
要求：压差安全阀必须具有将两个止回阀之间的“区域”压力维持在比供应压力低至少2 P SI的功能。
Requirements: the pressure differential relief valve must operate to maintain the "zone" between the two check valves at least 2 PSI less than the supply pressure.
目的：检测差压安全阀的工作性能。
Purpose: To test operation of pressure differential relief valve.
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