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• VALVES & ACCESSORIES <br />MML <br />Check Valves <br />For use in Grooved -End Piping Systems <br />c 90 <br />a 80 <br />z 70 <br />z 60 <br />a <br />50 <br />� 40 <br />y <br />30 <br />0 <br />z <br />a 20 <br />z <br />0 15 <br />0 <br />y 10 <br />y 09 <br />¢ 08 <br />07 <br />z 06 <br />0 05 <br />z 100 <br />FLOW DATA: <br />The approximate friction <br />losses, based on the Hazen and <br />Williams formula, expressed <br />in equivalent length of pipe is <br />given below. The friction losses <br />have been calculated on the <br />basis of flow rates typically <br />used with each size valve. <br />Friction Loss Series 7800 Check Valve (Water at 65T) <br />200 300 400 500 700 1000 2000 3000 4000 5000 7000 10000 <br />FLOW RATE IN GALLONS PER MINUTE (GPM) <br />90 c <br />80 a <br />70 z <br />60 z <br />50 <br />a <br />40 � <br />30 <br />y <br />0 <br />z <br />20 a <br />z <br />1 5 0 <br />0 <br />1 0 y <br />09 y <br />08 ¢ <br />07 <br />06 z <br />05 0 <br />z <br />• • • <br />OF <br />C=100 <br />C=120 <br />Valve Size <br />O.D. <br />Sch. 10 <br />Sch. 30 <br />Sch. 40 <br />Sch. 10 <br />Sch. 30 <br />Sch. 40 <br />INmm <br />In <br />Fbm <br />Fbm <br />Fbm <br />FtJm <br />Ft Jm <br />Fbm <br />2 <br />2.375 <br />10 <br />- <br />8 <br />14 <br />- <br />11 <br />59 <br />69.3 <br />3.9 <br />- <br />24 <br />4.3 <br />- <br />3A <br />21/2 <br />2.875 <br />14 <br />- <br />10 <br />20 <br />- <br />15 <br />65 <br />73.9 <br />ell <br />- <br />3.9 <br />6.1 <br />- <br />ell <br />3 <br />3.500 <br />17 <br />- <br />12 <br />23 <br />- <br />17 <br />89 <br />88.9 <br />5,2 <br />- <br />3.7 <br />TO <br />- <br />5,2 <br />4 <br />4.500 <br />17 <br />- <br />13 <br />23 <br />- <br />18 <br />100 <br />114.3 <br />52 <br />1 - <br />4.9 <br />TO <br />- <br />5,5 <br />5 <br />5.563 <br />14 <br />- <br />11 <br />20 <br />- <br />15 <br />125 <br />141.3 <br />ell <br />- <br />3.4 <br />6.1 <br />- <br />ell <br />6 <br />6.625 <br />23 <br />- <br />19 <br />33 <br />- <br />26 <br />150 <br />168.3 <br />70 <br />- <br />5.8 <br />19.1 <br />- <br />7.9 <br />8 <br />8.625 <br />35 <br />32 <br />30 <br />50 <br />45 <br />43 <br />200 <br />219.1 <br />19.7 <br />9.8 <br />9.1 <br />15,2 <br />13.7 <br />13.1 <br />10 <br />10.750 <br />28 <br />25 <br />24 <br />40 <br />36 <br />34 <br />250 <br />273.1 <br />8,5 <br />T6 <br />T3 <br />122 <br />11.9 <br />19.4 <br />12 <br />12.750 <br />31 <br />28 <br />26 <br />44 <br />39 <br />37 <br />300 <br />323.9 <br />9A <br />8.5 <br />T9 <br />13A <br />11.9 <br />11.3 <br />_&ORTANT ni <br />Check valve life maybe shortened and system damage may occur It check valves are Installed too close to a source of unstable flow. Checkvalves <br />must be Installed at a reasonable distance away from pumps, elbows, expanders, reducers or other similar devices. Sound piping practices dictate <br />a minimum of five (5) times the pipe diameter for general use. Distances between three (3) and five (5) diameters are allowable provided the flow <br />velocity Is less than 8 feet per second. Distances less than 3 diameters are not recommended. <br />This valve may be Installed vertically or horizontally In a horizontal Installabon, the hinge pin Is to be located on top. <br />Not for use In copper systems. <br />GL-7.12 <br />