Pneumatic And Hydraulic Equipment Page 788

Piston Rod Diameter Selection: Applications requiring long extend (push) strokes may require oversize piston rod diameters to prevent buckling. To determine the correct rod diameter for your application follow these simple steps: 1. Select the thrust from the Cylinder Force and Volume Chart that is required for your application. For pressures not shown use: Force = Piston Surface Area x Operating Pressure 2. From the Cylinder Mounting Diagram Chart select the mounting style being used. 3. To obtain effective length "L", multiply cylinder stroke by appropiate stroke factor located in Cylinder Mounting Diagram Chart. If cylinder has extra rod extension add this to the stroke length before obtaining effective length. Effective Length = Actual Stroke x Stroke Factor 4. To determine adequate rod diameter locate calculated effective length "L" on Rod Selection chart (below). Tie Rod Tightening: In order to reduce the possibility of cylinder binding or damage, tighten to quarter unit increments of the final torque value in the following order: #1, #2, #3, #4. Then torque fully to the recommended foot pounds in the same order. Series A, EA, J, EJ, NFPA Air Cylinders, Technical Information Recommended Torques for Tightening Tie Rods Cylinder Standard Stainless Steel Bore Steel Tie Rods Tie Rods 1-1/2" 6.6 ft. lbs. 3.75 ft. lbs. 2" 11 ft. lbs. 7.5 ft. lbs. 2-1/2" 13 ft. lbs. 7.5 ft. lbs. 3-1/4" 20 ft. lbs. 13-14 ft. lbs. 4" 24 ft. lbs. 13-14 ft. lbs. 5" 40 ft. lbs. 33 ft. lbs. 6" 48 ft. lbs. 33 ft. lbs. 7" & 8" 100 ft. lbs. 65 ft. lbs. 10" 150 ft. lbs. 75 ft. lbs. 12" 175 ft. lbs. 87.5 ft. lbs. NFPA AIR CYLINDERS Cylinder Force and Volume Charts All Dimensions in Inches Extend Forces in pounds All Forces in Pounds Volume Cu. Ft. Piston PSI Displacement Bore Area 40 60 80 100 150 200 Per Inch 1-1/2" 1.77 71 106 142 177 266 353 .00102 2" 3.14 126 189 251 314 471 628 .00182 2-1/2" 4.91 196 295 393 491 737 982 .00284 3-1/4" 8.30 332 498 664 830 1245 1659 .00480 4" 12.57 503 754 1005 1257 1886 2513 .00727 5" 19.64 785 1178 1571 1964 2946 3928 .01137 6" 28.27 1130 1696 2262 2827 4240 5654 .01636 7" 38.49 1540 2309 3079 3849 5774 7698 .02227 8" 50.26 2010 3015 4020 5026 7539 10052 .02909 10" 78.54 3141 4712 6283 7854 11781 15700 .04545 12" 113.10 4524 6786 9048 11310 16965 22620 .06545 Deduct these Forces for Retract Strokes Volume Cu. Ft. Rod PSI Displacement Rod Area 40 60 80 100 150 200 Per Inch 5/8" .307 12 18 25 31 46 61 .00018 1" .785 31 47 63 78 118 157 .00045 1-3/8" 1.485 59 89 119 149 222 297 .00086 1-3/4" 2.404 96 144 192 240 360 480 .00139 2" 3.142 126 189 251 314 471 628 .00182 2-1/2" 4.909 196 295 393 491 736 981 .00284 Norgren pneumatics (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com JHF Catalog [ Volume 7 ] 788 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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