cv值计算？ 液流： liquid flow: 在此：q = 液流量（每分钟加仑数） △p = 通过阀门的压降（psi） s = 介质的具体重 where... q = flow rate (gallons per minute) △p = pressure drop across value (psi) s = specific gravity of media 这个方程式适用于湍流和粘性接近于水的液体。 （cv是指介质温度为60of的水，通过阀门产生1.0 psi压降 时的每分钟流量。）（这时水的具体重力是1。） 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).) 气流： gas flow: 在此…… where ... q = 气流 (scfh--标准立方英尺/小时) s = 气体比重 (空气 = 1.0) t = 华氏绝对温标 (of + 460) △p = 通过阀门的压降 (psi) p1 = 上游绝对压力 (psia) q = gas flow (scfh--std.cu.ft/hr) s = specific gravity of gas (air = 1.0) t = temp--degrees rankine (of + 460) △p = pressure drop across valve (psi) p1 = upsteam pressure (psia) absolute 注意：△p 必须小于 0.5 p1 (当△p 大于 0.5 p1时流量处于临界值.) note: △p must be less than 0.5 p1 (flow is critical when △p is greater than 0.5 p1.) 查看更多
第1天
关注盖德视界
添加小助手
