Technical Guide
DAN-LIQ-TG-44-rev0813
November 2013
10
0 10 20 30 40 50 60 70 80 90 100
PERCENT STROKE
SPRING FORCE (lbs.)
Section 2
PRESSURE VERSUS VARIABLE FORCE REQUIRED
Pressure, force, and area were discussed in the Pressure Defined section. It was stated that pressure indicates work load, and
force is proportional to pressure and area.
The principle described for Figures 2-2 and 2-3 is the same for Figure 1-4, with the exception of the work load. It is, in this
instance, a variable force (linear spring). The spring exerts 100 pounds of force or resistance in the full position of the power
cylinder (Figure 2-2) and 50 pounds in the down position (Figure 2-3). The spring is linear in force; therefore, if the power cylinder
were at 50% of stroke, the spring force would be 75 pounds (Figure 2-1).
Also, if the spring force were divided by the area in square inches of power cylinder piston, the answer would be the equivalent
force of the spring in psi. Therefore, the force of the spring can be rated as 5 to 10 psi resistance.
Figure 2-1
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