pneumatics, 3 circuit valves - lab-volt · circuit valves exercise 3 exercise objective discussion...

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© Festo Didactic 89791-00 63

Directional valve actuators. Direct actuation (manual and mechanical). Port labeling. Operation of a 3-port, 2-position mechanical valve. Pilot actuation. Electrical actuation. Electro-pneumatic actuation.

Check valves

Circuit Valves

Exercise 3

EXERCISE OBJECTIVE

DISCUSSION OUTLINE

DISCUSSION

Exercise 3 – Circuit Valves Discussion

64 © Festo Didactic 89791-00

Needle valves

Flow control valves



Directional control valves

m n mn

envelopes



a Appendix D shows examples of directional control valve symbols.

Directional valve actuators

valve actuators operators

a Appendix D shows the symbols used for the main types of valve actuators.

oreither or

and

Direct actuation (manual and mechanical)



Port labeling

Operation of a 3-port, 2-position mechanical valve



Pilot actuation



Electrical actuation



Electro-pneumatic actuation



c ElectricityProgrammable Logic Controllers

Exercise 3 – Circuit Valves Procedure Outline


Directional control valve applications

Observations as the system operates. PLC outputs for directional control valves. Manual overrides.

Presenting your work.

Pneumatic components and their symbols

PROCEDURE OUTLINE

PROCEDURE

Exercise

© Festo D

e 3 – Circuit Va

Didactic 89791-00

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Exercise 3 – Circuit Valves Procedure




b

Electro-pneumatic directional control valves

Observations as the system operates



b

PLC outputs for directional control valves



a These tables are shown along with figures showing the directional control valves and their valve actuators. In Step 12, you will associate each PLC digital output with a valve actuator.



Manual overrides

a Avoid using a pencil or other instrument that will leave marks on the valves. Do not use an instrument with a sharp point that could damage the valves. Do not use the probe of a multimeter as the wire connected to the probe could dangle on the workstation and be caught in an actuator.



a When one solenoid on a double solenoid valve is energized, the manual overrides on that valve have no effect.

If this prevents you from identifying the valve using the manual overrides, refer to your answer to the questions in Step 7.



Flow control valves



b

Troubleshooting

a As a systems operator, you should be able to localize malfunctions and identify their causes and sources. In some cases, you will be able to fix the malfunction yourself. In many cases, however, you will be required to document the malfunctions and pass this information onto the appropriate experts for resolution. Be as precise as possible in describing the problem. Refer to all components using the correct names and device tags as shown in the system plans.



Presenting your work

Exercise 3 – Circuit Valves Conclusion


End of the exercise

CONCLUSION

REVIEW QUESTIONS

Exercise 3 – Circuit Valves Review Questions


pneumatics, 3 circuit valves - lab-volt · circuit valves exercise 3 exercise objective discussion...

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