DOUBLE ACTING CYLINDER

IT IS USED IN PNEUMATICS AND HYDRAULICS

1. DOUBLE ACTING CYLINDER BY CH.NARENDRA CHOWDARY M2 SEC

2. 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. INTRODUCTION

3. PARTS OF DAC: Cylinder Plunger Piston rod Connection ports

4. 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.

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

6. 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. SIZES OF D.A.C

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

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

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

10. Every movement uses compressed air . No defined position in the event of compressed air failure. DISADVANTAGES

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