BY

CH.NARENDRA CHOWDARYM2 SEC

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.

PARTS OF DAC:

I. Cylinder

II. Plunger

III. Piston rod

IV. Connection ports

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.

WORKING:

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

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.

Extending Stroke: Fe = (p / 4) * D² x P

Retraction Stroke: Fr = (p / 4) * (D²-d²) x P

FOR DOUBLE ACTING CYLINDER

Required Air Flow Rate

Max Pressure/Required Pressure

Capable Force

Capable Torque

Max RPM

Linear Velocity

S PS

• More compact body when compared to single acting.

•Constant force(Dependent on stroke)

• Higher force with smaller bore size due to absence of spring.

• Every movement uses compressed air.

•No defined position in the event of compressed air failure.