On the base of large experimental data set, the influence of effective pressure on rock velocities is analyzed with regression method and the theory of crack closure.
根据大量的实验资料，本文分析了砂岩样品的纵横波速度和有效压力的关系，对实验结果进行了回归分析，并用裂隙闭合理论进行了解释。
The valve petal USES the spring to load, its quick closedown can effective reduce the hammer pressure, the sealing property is good, the closure does not have the noise.
阀瓣采用弹簧加载，其快速关闭能有效的减小水锤压力，密封性能好，关闭无噪声。
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