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Direct and indirect control of single acting & double acting air cylinders motors

Q.1.What is a pneumatic circuit? How it differs from Hydraulic circuit ?

Ans : A pneumatic circuit may be defined as the graphic representation of the pneumatic components in a pneumatically operated machine.Unlike in hydraulic circuit, the
air is directly exhausted to the atmosphere in a pneumatic circuit, so there is no piping to return the working medium. Secondly in the hydraulic circuit diagrams as the source is compressed air, a compressor is not shown in the diagram.

Q.2. Draw the circuit diagram for speed control of double acting pneumatic cylinder.


Q.3.Draw pilot operated DA cylinder circuit using 4 X 2 DC valve and 3 X 2 pilot valve. Or Draw pilot operated circuit for actuating a double acting cylinder