Fluid Power Diagrams and Questions (Mechanical engineering Pneumatic & hydraulic)

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MODULE TITLE : APPLICATIONS OF PNEUMATICS AND HYDRAULICS

TOPIC TITLE : FLUID POWER DIAGRAMS

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APH - 1 - TMA (v1)

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Published by Teesside University Open Learning (Engineering)

School of Science & Engineering

Teesside University

Tees Valley, UK

TS1 3BA

+44 (0)1642 342740

retrieval system, or transmitted, in any form or by any means, electronic, mechanical,

photocopying, recording or otherwise without the prior permission

of the Copyright owner.

This book is sold subject to the condition that it shall not, by way of trade or

otherwise, be lent, re-sold, hired out or otherwise circulated without the publisher's

prior consent in any form of binding or cover other than that in which it is

published and without a similar condition including this

condition being imposed on the subsequent purchaser.

IMPORTANT

Before you start please read the following instructions carefully.

1. This assignment forms part of the formal assessment for this module. If

you fail to reach the required standard for the assignment then you will be

allowed to resubmit but a resubmission will only be eligible for a Pass

grade, not a Merit or Distinction.

You should therefore not submit the assignment until you are reasonably

sure that you have completed it successfully. Seek your tutor's advice if

unsure.

2. Ensure that you indicate the number of the question you are answering.

3. Make a copy of your answers before submitting the assignment.

4. Complete all details on the front page of this TMA and return it with

the completed assignment including supporting calculations where

appropriate. The preferred submission is via your TUOL(E) Blackboard

account:

https://eat.tees.ac.uk

5. Your tutor’s comments on the assignment will be posted on Blackboard.

Teesside University Open Learning (Engineering)

1. FIGURE 1 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.

(d) State how the system works.

(e) State the functions of valves and .

FIG. 1

1 2 3 4

Teesside University Open Learning (Engineering)

2. FIGURE 2 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.

Teesside University Open Learning (Engineering)

FIG. 2

c 0

A 1

A 0

a 0

B 1

B 0

d 0

C 1

C 0

b 0

D 1

D 0

d 1

b 1

G ro

u p I

G ro

u p I

c 1 ST

S el

ec t

G P

I S el

ec t

G P

I I

a 1

A B

C D

a 0

b 0

c 0 d

c 1 b

1 a

1 d

Teesside University Open Learning (Engineering)

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.

4. Modify the circuit designed for question 3 to provide an emergency stop

which will park both cylinders in the extended position (i.e. A + B +).

5. Modify the circuit designed for question 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.

6. FIGURE 3 shows a hydraulic circuit.

(a) State the name and purpose of the components shown in the circuit

diagram.

(b) Explain the operation of this circuit.

Teesside University Open Learning (Engineering)

FIG. 3

7. Modify the design of the circuit shown in FIGURE 3 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.

M E

F F

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Question No.

Teesside University Open Learning (Engineering)

Question No.

Teesside University Open Learning (Engineering)

Question No.

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