最大连续流量以管线流速20英尺/秒为基础。
最大间歇流量以管线流速25英尺/秒为基础。
阀门流量系数是每分钟多少美制加仑流量，温度为15^oC，压降为1 psi。
所提供的流量系数是以阀门全开为前提。
阀门系数Cv可以应用在下列方程式中计算流量（Q）和压降（∆P）
Maximum continuous flow based on pipeline velocity of 20 ft. per second.
Maximum intermittent flow based on pipeline velocity of 25 ft. per second.
The Cv factor of a valve is the flow rate in US GPM at 60^oF that will cause a 1 psi drop in pressure.
The factors stated are based upon a fully open valve.
Cv factor can be used in the following equations to determine Flow (Q) and Pressure Drop (∆P):

Q (流量) = Cv Q (Flow) = Cv

∆P (压降) = (Q/Cv)2 ∆P (Pressure Drop) = (Q/Cv)2

水头损失
Headloss

流量 - 美制加仑/分钟（水）
Flow Rate - Gallons per Minute (Water)