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Automating Manufacturing Systems - Process Control and ...

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discrete actuators - 5.5<br />

F<br />

advancing<br />

Fluid pumped in<br />

at pressure P<br />

Fluid flows out<br />

at low pressure<br />

F<br />

retracting<br />

Fluid flows out<br />

at low pressure<br />

Fluid pumped in<br />

at pressure P<br />

For Force:<br />

where,<br />

P<br />

=<br />

F<br />

--<br />

A<br />

F<br />

=<br />

PA<br />

P = the pressure of the hydraulic fluid<br />

A = the area of the piston<br />

F = the force available from the piston rod<br />

Figure 5.4<br />

A Cross Section of a Hydraulic Cylinder<br />

Single acting cylinders apply force when extending <strong>and</strong> typically use a spring to<br />

retract the cylinder. Double acting cylinders apply force in both direction.

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