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。
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。
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.
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