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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />TABLE 5-a <br /> <br />SPECIAL LOSSES OF HEAD IN TERMS OF V2/2g <br /> <br />Nature of Special <br />Resistance <br /> <br />Loss in Terms2 <br />Multiple of V /2g <br /> <br />Authority <br /> <br />Butterfl~ Valves <br />8 = lO <br />8 = 200 <br />8 300 <br />8 400 <br />8 500 <br />(} = 600 <br />8 = 700 <br />8 = 800 <br /> <br />0.46 <br />1. 38 <br />3.6 <br />10 <br />3l <br />94 <br />320 <br />1750 <br /> <br />Tests on 6" valve <br />for a vel. of 3 ft. <br />per second. <br />Turneaure and <br />Russell, "Public <br />Water Supplies", <br />1940, p. 236. <br /> <br />I <br />I <br /> <br />Check Valves <br />Horizontal <br />Ball Type <br />Swing Check <br />Swing Check <br /> <br />Lift Type <br /> <br />(fully open) <br /> <br />8 - 12 Tent. Stds. Hydr. Inst. <br />65 - 70 " " " " <br />0.6 - 2.3 " " " " <br />2.5 Crane Company <br /> <br />I <br /> <br />Gate Valves <br />Wide open <br />1/4 closed <br />1/2 closed <br />3/4 closed <br /> <br />0.19 <br />1.15 <br />5.6 <br />24.0 <br /> <br />Bulletin No. 2552 <br />U of Wis. (Av) <br /> <br />I <br /> <br />o <br />90 Elbow <br />Regular Flanged <br />Long Radius Flanged <br /> <br />0.2l - 0.30 <br />0.l4 - 0.23 <br /> <br />Tent. Stds. Hydr. Inst. <br />11 tl 1t " <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />o <br />45 Elbow <br />Regular Screwed <br />Long Radium Flanged <br /> <br />0.30 - 0.42 <br />O.l8 - 0.20 <br /> <br />Tent. Stds. Hydr. Inst. <br />" " II " <br /> <br />I <br /> <br />I <br /> <br />V - 5 <br />