不是跟你提供的数据差不多吗？
第一个用于液体流量：:
where... Q = flow rate (gallons per minute)
　　　　△P = pressure drop across value (psi)
　　　　S = specific gravity of media
This equation is good for turbulent flow and for liquids with viscosities near that of water.
(Cv is defined as the flow in GPM that a valve will carry with a pressure drop of 1.0 psi when the media is water at 60oF.) (The specific gravity of water is 1 (one).)

但有个条件，你的流量速度单位是？如果是每分钟加仑数的话，应该没有多大问题的，