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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
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