1)      In the turbulent flow , from the previous plot (Figure 6 ) we notice that there is no relation between Reynolds number and the loss coefficient .

The values of loss coefficient K for various types of valves and fittings are tabulated in Figure(7) ,we compare our experimental ‘k’ values with these found as the flowing:

1)   

  

From the previous comparison Table we used Figure (9) by dividing the diameter of the pipe over the diameter of enlargement and contraction (D1/D2 =0.2 ). We find that our experimental values are slightly different ( about 50% ) than the values from figure (9).

From the previous comparison table,(15). we can clearly notice that the loss coefficient values for the Gate valve 25% open are very close to the value from Figure 7 ( about 4% different) . While the loss coefficient values for Gate valve 50% open differ from the values in Figure 7 ( about 50% different ) .

3)       For standard Elbow 90^ο

From Figure 7 , we found that the loss coefficient for the standard elbow equal 0.75 , and our average experimental value was 0.2034 , which is very different than 0.75 .

4)       Meter and Short bends

For these two types of fitting we didn’t find  enough resources ,that provides the loss coefficient K .   

As we notice in the previous comparison and when we compare our results with the values in Figure (7) and (9), we got different values of  loss coefficient K, because in reality the value of K varies with the size of the fitting , the level of turbulence (Reynolds number ), and the dimension of the fitting ,such as the diameter and radius for curvature[4].