The University Of Nwfp

The university of NWFP School of Engineering CONTENTS: • Introduction to Hydraulic and • Pneumatic Systems

Prime Movers • Practically every industrial process requires objects to be moved, manipulated, held, or subjected to some type of force. The three most commonly employed methods for producing the required forces/motions are: • Electrical – motors, solenoids • Air – Pneumatics • Liquids - Hydraulics

Source of Words • Hydraulics – Hydra (Greek for water) aulos (Greek for pipe) • Pneumatic - Pneumn (Greek for wind or breath)

Pneumatic Systems • Pneumatic systems are widely used in industrial automation systems. Common Applications • Push-pull • Pick-n-place • Lifting • Holding • Air-driven hand tools

Air Distribution Systems • • • • • • • •

Air Compressor Dryers Distribution Regulators Control Valves Filters Cylinders Air tools

Raising a Weight Pneumatically

Control Valves • There are three principal types of control valves used in pneumatic systems. • Direction Control – used to control the flow direction usually solenoid driven. • Flow Control – used to control the flow rate • Pressure Control – Regulates ΔP across valve

Seals • • • • • • • •

Leakage from a hydraulic or pneumatic system can be a major problem. Loss of efficiency Increased power usage Loss of load capacity Environmental Damage Safety Hazard Sloppy/dirty equipment

Answer and Questions