IT IS USED IN PNEUMATICS AND HYDRAULICS

2. BY
CH.NARENDRA CHOWDARY
M2 SEC

3. Double Acting Cylinders
 Is a cylinder designed to use air to
extend and retract the piston.
 Double acting cylinders are far more
popular than single acting.
 They are available in single rod end and
double rod end, cushioned and non-
cushioned.

4. PARTS OF DAC:
I. Cylinder
II. Plunger
III. Piston rod
IV. Connection ports

5. A B
Cylinder is at rest when neither
port is energized.
When A is pressurized
the piston extends out
and B exhausts air.
When B is pressurized, the piston
retracts and A exhausts air. The
cylinder is now back to its original
state.

6. WORKING:
Thrust is developed
in both extending
and retracting
directions as air
pressure is applied
to the appropriate
ports.

7. Air cylinders are available in a variety of
sizes and can typically range from a small
2.5 mm air cylinder.
An 400 mm diameter air cylinders which
would impart enough force to lift a car.
Some pneumatic cylinders reach 1000 mm
in diameter.

8. Extending Stroke: Fe = (p / 4) * D² x P
Retraction Stroke: Fr = (p / 4) * (D²-d²) x P
FOR DOUBLE ACTING CYLINDER

9. Required Air Flow Rate
Max Pressure/Required
Pressure
Capable Force
Capable Torque
Max RPM
Linear Velocity
S PS

10. • More compact body when compared
to single acting.
•Constant force(Dependent on stroke)
• Higher force with smaller bore size
due to absence of spring.

11. • Every movement uses compressed air.
• No defined position in the event of
compressed air failure.