目的：检测差压安全阀的工作性能。
Purpose: To test operation of pressure differential relief valve.
将这个读数记录为安全阀的开启差压。
Record this as the opening differential pressure of the relief valve.
差压流量传感器也可用。
注意：重要的是，差压计的指针要慢慢下降。
Note: it is important that the differential gauge needle drops slowly.
介绍了差压式截止止回阀的结构、性能和设计要点。
To introduce the structure, performance and design of the differential stop check valve.
本文就压差换算提出一种方法并举出一个实例。
The article presents a method of pressure difference conversion and provides an example.
介绍了用压差测量仪测试水泵扬程的方法。
It is described how to measure the pump lift with pressure difference meter.
用压差法测试塑料薄膜的透气性，是一个长期使用的主流测试方法。
One of the main methods to test the gas permeability is using partial pressure difference.
观察第一止回阀压差(A-B)。
Observe the apparent first check valve differential pressure (a - b).
压差安全阀位于止回阀之间的区内。
A pressure differential relief valve is located in a zone between the check valves.
每周：测量压差。
对定产量生产，跟端压差随时间逐渐增大；
Under the constant production rate condition, the pressure difference at the heel increases with time.
文章介绍了所开发的经济压差优化无功潮流程序。
In this paper the optimum reactive power flow program of economic voltage difference is presented.
用新式压差法测量蒸发器水位，其测量精度高达2%。
With the new differential pressure method, the measuring accuracy is as high as 2%.
多级降压调节阀主要应用于有气蚀、噪音高、流体压差高的环境。
Multistage decompression regulating valve is mainly applied to cavitation, high noise, fluid high pressure environment.
多级降压调节阀主要应用于有气蚀、噪音高、流体压差高的环境。
Multistage decompression regulating valve is mainly applied to cavitation, high noise, fluid high pressure environment.
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