Hydraulics - Seafish
Hydraulics - Seafish
Hydraulics - Seafish
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24<br />
Hydraulic Pressure<br />
The pressure of the fluid acts equally in all directions. Figure 34<br />
shows an arrangement similar to a hydraulic jack. The small<br />
piston A would be operated by the handle of the jack and the<br />
larger piston B would lift the load e.g. a motorcar.<br />
I 50 lbs<br />
2000 lbs<br />
Area<br />
2 Sq. ins. (%" diameter) approx<br />
non-return,<br />
valve<br />
rr<br />
Pressure 25 p.s.i.<br />
T<br />
I<br />
T<br />
B<br />
77/77/<br />
tit<br />
Area<br />
80 Sq. ins.<br />
{10" diameter)<br />
approx<br />
Figure 34.<br />
Units<br />
Pressure = Force<br />
Area<br />
This can also be written Force = Pressure x Area<br />
In Figure 34, Pressure (psi) = Force (lbs) = 50<br />
Area (in2) 2<br />
= 25lb per square inch<br />
If this pressure acts on piston B then:<br />
Force produced = 25 x 80 = 2000 lbs<br />
The units used in the above calculation are Imperial Units which<br />
are gradually being superseded by SI Units. You will begin to<br />
find these on new equipment.<br />
Seaflsh Open Learning
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