Technical Guide
DAN-LIQ-TG-44-rev0813
November 2013
The force is 500 pounds and ...
The pressure equals force divided by
area equals 500 pounds divided by
10 sq. in. equals 50 psi.
The area is 10 sq. in.
50 psi
PUMP
500 lbs.
10 sq. in.
6
Pressure Indicates Work Load:
Figure 1-4 illustrates how pressure is generated by resistance of a load. It was noted that the pressure equals the force of the
load divided by the piston area.
We can express this relationship by the general formula:
In this relationship:
P is pressure in psi
F is force in pounds
A is area in square inches
From this we can see that an increase or decrease in the load will result in a like increase or decrease in the operating pressure. In
other words - pressure is proportional to the load, and pressure gauge reading indicates the workload, in psi, at any given moment.
Pressure gauge readings normally ignore atmospheric pressure. That is, a standard gauge reads zero at atmospheric pressure.
An absolute gauge reads 14.7 psi at sea level atmospheric pressure. Absolute pressure is usually designated “psia”.
Force is Proportional to Pressure and Area:
When a hydraulic cylinder is used to clamp or press, its output force can be computed as follows: F = P x A
Again:
P is pressure in psi
F is force in pounds
A is area in square inches
NO LEAK IN SYSTEM
Figure 1-4
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