Professor Charlton S. Inao

Defence UniveristyCollege of Engineering

Bishoftu, Ethiopia

PE -3231

Hydraulics and Pneumatics System Design

Chapter 6 Weeks 12,13,14

Control of SACUse 3/2 way valve

Control of DAC

Use 5/2 or 4/2 way valve

Meter In and Meter Out

Meter INMeter OUT

Automatic Return of DAC(Purely Pneumatics) Using Roller Lever Valve

Week 13

Automatic Return of Single Acting Cylinder (SAC) Using Relay Ladder LOGIC

Automatic to and fro(reciprocating) motion of Double Acting Cylinder

• Using Electrical Relay Ladder Logic

Actuation of Pneumatic Motors

Sequencing of SAC and DAC

Using Single Solenoid SAC/DAC

Sequence A+,B+,B-,A-

Using Double Solenoid

Sequence A+,B+,B-,A-

Pneumatic LOGIC==OR Logic

Pneumatic LOGIC==AND Logic