selecting a hyraulic system, hydraulic motor pump system, hydraulic fluid power system, cylinder and power unit, cylinder push in pounds, bore cylinder Selecting Cylinder & Power Unit | Applied Industrial Technologies |
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  Applied Industrial Technologies can help you select a hydraulic cylinder and power unit, including a "Cylinder Push in Pounds" table and a "Displacement (in cubuic inches)" chart.
   Products > ... Technical Reference > Selecting Cylinder & Power Uni

How to Select a Hydraulic Cylinder & Power Unit

Selection of the proper components for a hydraulic system is quite simple when you use the accompanying table and chart. Here is an example to illustrate their use. Assume your requirements are: 20,000 lbs. of force, 28” stroke, and 7.5 seconds for full cylinder extension.

Step One:
The table below shows a 3” diameter cylinder will develop 21,204 lbs. of force with 3000 psi pressure

Step Two:
A line has been drawn on the chart from 3” diameter through 28” stroke.

Step Three:
By continuing this line, it intersects 200 cubic inch displacement.

Step Four:
Another line drawn from 200 cubic inches through 7.5 seconds intersects 7 GPM.

Your Answer:
Using this example, the chart and table show that your components should be a 3” diameter 3000 psi cylinder and a hydraulic power unit with approximately 7 GPM and 3000 psi rating.

Theoretical horsepower for these values would be 12.25 hp. However, since most applications usually require maximum GPM and pressure for only a very short portion of each cycle, the electric motor of the hydraulic power unit will usually be considerably smaller (one half or less.)

Cylinder Push in Pounds table image

Displacemnt (in cubic inches) chart image

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