根据ASHRAE标准120（ASHRAE 2008），对分流和合流鞍形水龙头三通进行压力损失试验。对分流三通采用幂律曲线拟合，将支管损失系数关联为支管与常用流量和面积比的函数。同样地，对数曲线拟合模型被用来关联汇流三通的支管损失系数，作为支管与常用流量比的函数。调整对数函数的参数，以考虑拟合的面积比。 对于分流和汇合流，主要损失系数与直通流量比呈反比线性关系。主要损失系数数据在很大程度上独立于支路与公共面积之比。结果确定值的系数范围为0.543至0.927，表明具有适当的相关性。引文:伊利诺伊州芝加哥ASHRAE Transactions第118卷第1部分

Pressure loss tests were conducted on diverging and converging flow saddle-tap tees per ASHRAE Standard 120 (ASHRAE 2008). A power law curve fit was used for diverging flow tees to correlate branch loss coefficients as a function of branch-to-common flow rate and area ratios. Likewise, a logarithmic curve-fit model was used to correlate branch loss coefficients for converging flow tees as a function of branch-to-common flow rate ratio. The argument of the logarithmic function was adjusted to account for the area ratio of the fitting. For both diverging and converging flows, main loss coefficients were correlated in terms of an inverse linear relationship with the straight-to-common flow rate ratio. Main loss coefficient data were largely independent of branch-to-common area ratio. The resulting coefficient of determination values ranged from 0.543 to 0.927, indicating a suitable degree of correlation.