Unit 6. Pneumatics and hydraulics. Technology 4. What do we know?. Pneumatic and hydraulic circuits. Which of these circuits is hydraulic, pneumatic and electric?. How are these circuits similar and how do they differ?. Compressors in pneumatic circuits.
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Which of these circuits is hydraulic, pneumatic and electric?
How are these circuits similar and how do they differ?
What function do compressors carry out in pneumatic circuits?
How are reciprocating and rotary compressors different?
What function do actuators carry out in pneumatic circuits?
Which actuator above is single-acting and which is double-acting?
What is the function of a valve in a pneumatic circuit?
With what type of cylinder do we normally use a 4/2 valve?
How do the above shut-off valves work?
Which valve carries out the logic function AND and which carries out OR?
What is the function of the pump in hydraulic circuits?
What two types of pumps can you see above?
Pneumatic and hydraulic
Energy-generatingelements , transportelements, actuators, control elements
Pneumatic circuits are used in can-crushing machines, door open/close systems and pneumatic drills.
Provides the circuit with compressed air. There are two types: reciprocatingcompressors and rotarycompressors.
Usually made of steel or brass, soldered together or connected by steel orplasticconnectors
Rotary actuators produce the rotating movement of an axle.
Single-acting cylinders move a piston in one direction.
Double-acting cylinders move the piston back and forward.
Directional control valves: 2/2 valves and 4/2 valves
Flow control valves
Shut-off valves: non-return valves, dual-pressure valves and shuttle valves
Air dryers, filters, lubricators, pressurereliefvalves, conditioningunits, silencers
Hydraulic circuits use a pump instead of a compressor. They can be used in platform lifts, forklift trucksand hydraulicpresses.
Protection and maintenance elements
Filter, reliefvalve, and reservoir