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A pneumatic circuit used to stamp boxes is shown - Leaving Cert Engineering - Question d - 2008
Question d
A pneumatic circuit used to stamp boxes is shown. Explain what happens when push button A is pressed and released. 
Worked Solution & Example Answer:A pneumatic circuit used to stamp boxes is shown - Leaving Cert Engineering - Question d - 2008
Step 1
Explain what happens when push button A is pressed.
Answer
When push button A is pressed, it operates a 3-port two-stage valve. This action allows compressed air to flow from port 1 through to port 2 and into the top of the single-acting spring return cylinder. The compressed air exerts force on the piston, pushing it down against the spring and causing it to stamp the box beneath.
Step 2
Explain what happens when push button A is released.
Answer
Upon releasing push button A, port 1 closes. The return spring then pushes the piston back up the cylinder, exhausting the air through ports 2 and 3. This action resets the piston to its original position, ready for the next stamping operation.