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problem 1: Figure below shows a pneumatic circuit diagram used for air supply and exhaust in an automatic control system.

a) Name all symbols (including pipelines) used in the system.
b) Number the ports of each DCV.
c) Classify the sections of the components in the circuit.
d) State how the system works.
e) State the functions of valves 1 and 2.

1556_pneumatic circuit diagram.jpg

problem 2: Figure below shows a pneumatic circuit in which four actuators are controlled.

a) State the sequence in which the cylinders operate on the operation of the start valve.
b) Show, with the aid of a schematic diagram, how an electronic controller could be included in the circuit to control the sequence of cylinder operations.

629_pneumatic diagram with actuators.jpg

problem 3: Design and draw a circuit using the cascade system to operate two cylinders (A and B) which, on the operation of a start valve, produces the sequence A – B + B – A+.   The cylinders should park in the positions B – A + when the start switch is in the ‘off’ position.

problem 4: Modify the circuit designed for problem 3 to provide an emergency stop which will park both cylinders in the extended position (i.e.  A + B +).

problem 5. Modify the circuit designed for problem 3 to provide a fail safe. The fail safe should:

a) act in the event of a reduced pressure at inlet to the group selecting valve.

b) park the cylinders in the retracted position.

problem 6: Figure below shows a hydraulic circuit.

a) State the name and purpose of the components shown in the circuit diagram.
b) describe the operation of this circuit.
c) describe the limitations of this circuit in terms of ‘speed control’.

2320_hydraulic circuit.jpg

problem 7: Modify the design of the circuit shown in figure above and draw a circuit diagram to provide rotary actuation in both directions using a single direction pump (to replace the bi-directional pump) and providing a means of preventing over-speeding in the case of an overhauling load in both directions.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M9920
  • Price:- $80

Priced at Now at $80, Verified Solution

Working of the pneumatic circuit: The system deals with the actuation of the double acting cylinder by using the pneumatic system having 5/2 Dc valve and two 3/2 Dc valve and a check valve with proper arrangements of plungers and spring so that the circuit once started becomes self-pursuing. Initially when the valve 4 is in the default position the, valve 5 works in its left position and thus supplies air to the check valve 2. Thus the piston actuates towards the left.

  • AsyU replied

    Thank you so much tutor for providing me such a good solution of this problem... Your solution helped me alot... Thank you so much for your help...

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