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ACTUATORS 1 ACT-07 For further information www.norgren.com NFPA Aluminum & Steel Cylinders 3 Energy Absorption Capacity of the Impact Dampening Seals. Series EA and EJ cylinders have a impact dampening piston seal that accomplishes 80% of the actual load stopping. The air cushion accounts for only 20%. (A conventional air cushioning cylinder depends 100% on the compressibility of air to do the stopping.) The Ecology seal absorbs high impact loads allowing the effect of the air cushion to be reduced by using a larger air cushion bleed orifice. As a result the piston can move at a faster speed for a longer period of time before the Ecology seal does the final stopping. Norgren NFPA Ecology Cylinders offer these advantages: Effect of Impact Dampening Seals on Total Stroke of Cylinders Energy Absorption Capacity of the Impact Dampening Seals *Usable Pounds Stoppable at the Following Piston Speeds This chart features the energy absorption capacity of the impact dampening piston seals with a Non-Adjustable cushions. For higher loads and velocities please refer to the Decel- Air Cushion. Piston and rod assembly for 1-1/2" thru 5" bore cylinders with 1/2" to 2" stroke 1 Norgren cylinders are pre- lubricated for non-lube operation. The piston rod is self- lubricated by the oil-impregnated rod bearing during operation. Lubrication between piston and cylinder barrel is derived from the polishing qualities of the reinforced PTFE wear ring. The low friction surfaces extend the life of the seals beyond normal expectations. Series EA and EJ cylinders are NFPA interchangeable and are available in many different mounting styles. 2 Operates Quietly to Meet OSHA Specifications. Series EA and EJ cylinders provide substantial reductions in impact noise, which reduces overall machine noise and helps meet government regulations. The summary of sound decibels chart illustrates the operating sound levels. The impact dampening qualities of the Piston Seals are guaranteed for ONE FULL YEAR! PSI Air Sound Pressure Level+ Cylinder Model J133B3 EJ155B3 J1133A3 EJ1155A3 A133B3 EA155B3 A1133A3 EA1155A3 5" x 6" 5" x 6" 2" x 6" 2" x 6" 5" x 6" 5" x 6" 2" x 6" 2" x 6" 95 PSI+ End++ 108 73 110 74 108 73 110 74 Side++ 112 84 110 81 112 84 110 81 50 PSI+ End++ 108 73 113 74 108 73 113 74 Side++ 113 85 110 81 113 85 110 81 +Peak sound pressure is given in decibels (dB) re:2 x 10 5 N/m 2 . ++End position of mike was 3' on centerline from end of cylinder; side position of mike was 3' perpendicular to centerline abeam of end of cylinder. Note: At 5 feet, cylinder sound levels would be less by 9 dB from side figure and 13 dB from end figure. The total noise emitted will depend on the structure to which the cylinder is attached. If it is mounted on a thin flat plate of considerable area, the noise will be increased by a sounding board effect. Summary of Sound Levels in Decibels In/Sec Cylinder Bore 1 1/2 2 2 1/2 3 1/4 4 5 6 7 8 10 12 6 155.6 275.5 499.8 969.3 1505.4 2603.2 4159.8 5794.2 8067.6 12,242 20,139 12 38.4 68.1 123.4 239.7 372.6 644.8 1030.2 1435.8 2000.4 3026 4971 18 16.7 29.7 53.7 104.6 162.8 282.1 450.6 628.7 876.8 1319.3 2162.1 24 9.2 16.3 29.4 57.3 89.4 155.2 247.8 346.2 483.6 722 1179 30 5.6 10.0 18.1 35.4 55.4 96.4 153.9 215.4 301.6 445.5 724 36 3.7 6.7 11.9 23.5 37.0 64.5 102.9 144.4 202.7 295.3 476.8 42 2.6 4.6 8.2 16.3 25.8 45.3 72.2 101.6 143.1 204.8 327.7 48 1.8 3.2 5.8 11.7 18.6 32.8 52.2 73.8 104.4 146 231 54 1.3 2.4 4.2 8.5 13.6 24.2 38.5 54.7 77.9 105.7 164.7 60 1.0 1.8 3.0 6.2 10.1 18.1 28.7 41.1 58.9 76.9 117.2 *The weight of the cylinder piston has been deducted from the figures shown above. Note: The use of FPM Seals limits the absorption of the impact dampening seals by 50%. In/Sec Cylinder Bore 1 1/2 2 2 1/2 3 1/4 4 5 6 7 8 10 12 6 279 495 899 1,744 2,709 4,685 7,486 10,429 4,520 22,035 36,250 12 68 122 221 430 699 1,159 1,854 2,583 3,800 5,446 8,947 18 30 53 95 187 291 507 810 1,130 1,576 2,374 3,891 24 16 29 52 102 160 279 444 622 869 1,299 1,414 30 10 18 32 63 99 172 275 387 541 801 1,303 36 6.7 12 21.6 42 66 116 183 259 363 531 856 42 4.7 8.3 14.7 29 46 81 129 181 257 367 588 48 3.4 5.7 10.4 21 33 59 93 131 187 262 415 54 2.3 4.3 7.6 15.3 24 43 68 97 138 189 295 60 1.8 3.2 5.4 11 18 33 52 74 106 138 211 Energy absorption capacity of impact dampening piston seals w/ adjustable cushion. PSI Cylinder Bore 1 1/2 2 2 1/2 3 1/4 4 5 6 7 8 10 12 0 .14 .15 .17 .19 .22 .25 .28 .32 .32 .36 .40 20 .10 .10 .12 .14 .16 .18 .20 .22 .22 .24 .26 40 .07 .07 .08 .09 .10 .12 .13 .14 .14 .15 .16 60 .04 .04 .05 .05 .06 .07 .07 .08 .08 .09 .10 80 .02 .02 .02 .02 .03 .03 .03 .04 .04 .04 .04 100 0 0 0 0 0 0 0 0 0 0 0 Note: These figures are for new cylinders. The impact dampening seals will take some compression set during operation of the cylinder and the stroke loss will decrease. Also, the pressure at zero stroke loss will decrease to about 80 psi. At pressures above those of zero stroke loss, a slight clicking sound may be produced during impact. To determine the stroke loss for either the head or cap end, divide the value shown by 2.