Briefly introduce the standard, process and methods of flow test of valve, and analyze the affecting factors to results such as re.
介绍了阀门流量试验的方法和标准，分析了影响流量试验结果的各种因素如雷诺数等。
The measurement of high frequency dynamical flow in dynamical test of electro-hydraulic proportional valve and electro-hydraulic servo valve is very difficult.
在电液比例阀和电液伺服阀动特性测试中，高频动态流量的测量一直是一个难题。
The National Fire Protection Agency (NFPA) Guidelines require a confirming flow test to be conducted whenever a "main line" valve such as the shutoff valves or a backflow assembly have been operated.
美国国家防火协会（NFPA）指导原则要求对于主管线上运行的阀门，如关闭阀或防回流阀总成，必须进行流量测试。
Chapter 4 first test the starting pressure of valves, leakage of valve port, flow characteristic and response time, and then the experimental results are analyzed and compared.
第四章首先测试了阀片的启动压力、阀口泄漏量、流量特性以及压力响应时间，然后对实验结果进行了分析和比较。
The numerical simulation was used to analyze the flow characteristics of cryogenic throttle valves. A test bench was also built up to investigate the performance of the different valve needles.
运用数值模拟方法分析了节流阀的流量特性，并运用实验的手段测量了其流量系数与阀门开度之间的关系。
The numerical simulation was used to analyze the flow characteristics of cryogenic throttle valves. A test bench was also built up to investigate the performance of the different valve needles.
运用数值模拟方法分析了节流阀的流量特性，并运用实验的手段测量了其流量系数与阀门开度之间的关系。
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