Working with SI (System International) Cylinders - Part 2

FLUID POWER - Design Data Sheet 75

Piston Velocity - Metric Hydraulic Cylinders - For Pump Flows of 3 to 75 Liters per Minute

Piston
Diameter
mm.
Rod
Diameter
mm.
3
l/min.
5
l/min.
10
l/min.
15
l/min.
20
l/min
25
l/min.
30
l/min.
40
l/min.
50
l/min.
75
l/min.
25 None* 6.111 10.19 20.37 - - - - - - - - - - - - - - - - - - - - - - - - - - - -
12 7.938 13.23 26.46 - - - - - - - - - - - - - - - - - - - - - - - - - - - -
18 12.68 21.14 42.27 - - - - - - - - - - - - - - - - - - - - - - - - - - - -
32 None* 3.732 6.220 12.44 18.66 Figures in the body of this chart are piston
speeds in meters per minute (m/min).
- - - -
14 4.614 7.690 15.38 23.07 - - - -
22 7.077 11.80 23.59 35.39 - - - - - - - - - - - - - - - - - - - - - - - -
40 None* 2.387 3.978 7.955 11.93 15.91 19.89 - - - - - - - - - - - - - - - -
18 2.992 4.987 9.974 14.96 19.95 24.94 - - - - - - - - - - - - - - - -
28 4.677 7.795 15.59 23.39 31.18 38.98 - - - - - - - - - - - - - - - -
50 None* 1.528 2.547 5.094 7.641 10.19 12.74 15.28 20.39 - - - - - - - -
22 1.895 3.159 6.316 9.476 12.63 15.79 18.95 25.28 - - - - - - - -
36 3.174 5.290 10.58 15.87 21.16 26.45 31.74 42.34 - - - - - - - -
63 None* 0.9624 1.604 3.208 4.812 6.415 8.020 9.624 12.84 16.03 - - - -
28 1.199 1.999 3.998 5.997 7.995 9.995 11.99 15.00 19.82 - - - -
45 1.965 3.275 6.550 9.824 13.10 16.37 19.65 26.21 32.74 - - - -
80 None* 0.5968 0.9947 1.989 2.984 3.978 4.973 5.968 7.961 9.943 14.82
36 0.7483 1.247 2.494 3.742 4.988 6.236 7.483 9.982 12.47 18.71
56 1.170 1.950 3.900 5.850 7.800 9.751 11.70 15.61 19.49 29.25
100 None* 0.3820 0.6366 1.273 1.910 2.546 3.183 3.820 5.095 6.364 9.549
45 0.4790 0.7983 1.597 2.395 3.193 3.991 4.790 6.389 7.979 11.97
70 0.7490 1.248 2.497 3.745 4.993 6.241 7.490 9.991 12.49 18.72
125 None* 0.2445 0.4074 0.8149 1.222 1.630 2.037 2.445 3.261 4.073 6.112
56 0.3060 0.5100 1.020 1.529 2.039 2.549 3.059 4.080 5.096 7.646
90 0.5076 0.8460 1.692 2.538 3.384 4.230 5.076 6.771 8.457 12.69
160 None* 0.1492 0.2487 0.4974 0.7460 0.9946 1.243 1.492 1.990 2.486 3.730
70 0.1845 0.3080 0.6151 0.9227 1.230 1.538 1.845 2.462 3.074 4.613
110 0.2830 0.4716 0.9432 1.415 1.887 1.358 2.830 3.776 4.714 7.074
200 None* 0.0955 0.1592 0.3183 0.4775 0.6366 0.7958 0.9549 1.284 1.591 2.387
90 0.1197 0.1996 0.3991 0.5987 0.7982 0.9978 1.197 1.597 1.995 2.994
140 0.1872 0.3121 0.6241 0.9362 1.248 1.560 1.872 2.498 3.119 4.681

 

 

Piston Velocity - Metric Hydraulic Cylinders - For Pump Flows of 100 to 450 Liters per Minute

Piston
Diameter
mm.
Rod
Diameter
mm.
100
l/min.
125
l/min.
150
l/min.
175
l/min.
200
l/min.
250
l/min.
300
l/min.
350
l/min.
400
l/min.
450
l/min.
Figures in the body of this chart are piston speeds in meters per minute (m/min.). 
80 None* 19.89 24.87 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
36 24.94 31.18 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
56 39.00 48.75 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
100  None* 12.73 15.92 19.10 22.28 25.46 - - - - - - - - - - - - - - - - - - - -
45 15.97 19.96 23.95 27.94 31.93 - - - - - - - - - - - - - - - - - - - -
70 24.97 31.21 37.45 43.69 49.93 - - - - - - - - - - - - - - - - - - - -
125 None 8.149 10.19 12.22 14.26 16.30 20.37 24.44 28.52 - - - - - - - -
56 10.20 12.74 15.29 17.84 20.39 25.49 30.59 35.68 - - - - - - - -
90 16.92 21.15 25.38 29.61 33.84 42.30 50.76 59.22 - - - - - - - -
160 None 4.974 6.217 7.460 8.704 9.947 12.43 14.92 17.41 19.89 22.38
70 6.151 7.689 9.227 10.76 12.30 15.38 18.45 21.53 24.60 27.68
110 9.432 11.79 14.15 16.51 18.86 23.58 28.29 33.01 37.73 42.44
200 None 3.183 3.979 4.775 5.570 6.366 7.958 9.549 11.14 12.73 14.32
90 3.991 4.989 5.987 6.985 7.983 9.978 11.97 13.97 15.97 17.96
140 6.241 7.802 9.362 10.92 12.48 15.60 18.72 21.84 24.97 28.09

 

 

U. S. AND METRIC SI PRESSURE AND FLOW CONVERSIONS
for Operation of Air and Hydraulic Cylinders

PRESSURE   HYDRAULIC FLOW   AIR FLOW
PSI (lbs/sq. inch) and Bars GPM and Liters per Minute CFM and Cubic Decimeters per Sec
1 PSI = 0.0689655 Bar 1 GPM = 3.785 Liters per Minute 1 CFM = 0.47195 dm³/sec
1 Bar = 14.5 PSI 1 Liter per Minute = 0.2642 GPM 1 dm³/sec = 2.1187 CFM
PSI Bars   Bars
PSI GPM l/min   l/min GPM
CFM dm³/sec   dm³/sec CFM
20 1.379 1 14.5 1 3.785 5 1.32 1 0.472 5 10.59
30 2.069 2 29.0 2 7.570 10 2.64 2 0.944 10 21.19
40 2.759 3 43.5 3 11.36 15 3.96 3 1.416 15 31.78
50 3.448 4 58.0 4 15.14 20 5.28 4 1.888 20 42.37
60 4.138 5 72.5 5 18.93 30 7.93 5 2.360 30 63.56
70 4.828 6 87.0 10 37.85 40 10.6 10 4.720 40 84.75
80 5.517 7 102 15 56.78 50 13.2 15 7.079 50 105.9
90 6.207 8 116 20 75.70 75 19.8 20 9.439 75 158.9
100 6.897 9 131 25 94.63 100 26.4 25 11.80 100 211.9
120 8.276 10 145 30 113.6 125 33.0 30 14.16 125 264.8
140 9.655 15 218 35 132.5 150 39.6 35 16.52 150 317.8 
500 34.48 20 290 40 151.4 175 46.2 40 18.88 175 370.7
600 41.38 25 363 45 170.3 200 52.8 45 21.24 200 423.7
700 48.28 30 435 50 189.3 225 59.4 50 23.60 225 476.7
800 55.17 35 508 60 227.1 250 66.1 60 28.32 250 529.7
900 62.07 40 580 70 265.0 300 79.3 70 33.04 300 635.6
1,000 68.97 45 653 80 302.8 350 92.8 80 37.76 350 741.5
1,200 82.76 50 725 90 340.7 400 106 90 42.48 400 847.5
1,400 96.55 55 798  100 378.5 450 119 100 47.20 450 953.4
1,600 110.3 60 870 125 473.1 500 132 125 58.99 500 1,059 
1,800 124.1 65 943 150 567.8 550 145 150 70.79 550 1,165
2,000 137.9 70 1,015 175 662.4 600 159 175 82.59 600 1,271
2,250 155.2 80 1,160 200 757.0 700 185 200 94.39 700 1,483
2,500 172.4 100 1,450 225 851.6 800 211 225 106.2 800 1,695
2,750 189.7 125 1,813 250 946.3 900 238 250 118.0 900 1,907
3,000 206.9 150 2,175 275 1,041 1,000 264 275 129.8 1,000 2,119
3,250 224.1 175 2,538 300 1,136 1,100 291 300 141.6 1,100 2,331
3,500 241.4 200 2,900 325 1,230 1,200 317 325 153.4 1,200 2,542
4,000 275.9 250 3,625 350 1,325 1,300 343 350 165.2 1,300 2,754
4,500 310.3 300 4,350 375 1,420 1,400 370 375 177.0 1,400 2,966
5,000 344.8 350 5,075 400 1,514 1,500 396 400 188.8 1,500 3,178

 

Note that a “liter” is equal to a “cubic decimeter (dm³)” but the liter is used for liquid measure while the dm³ is used for air and gas volume measurement.

Note also that a “bar” is used widely in fluid power for pressure measurement, but the standard SI unit for pressure is the pascal (Pa) or the kilopascal (kPa). One kPa is equal to 0.00145 PSI, a unit which is difficult to work with in most fluid power systems.

 

Download a PDF of Fluid Power Design Data Sheet 75 - Working with SI (System International) Cylinders - Part 2

© 1990 by Womack Machine Supply Co. This company assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information.

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