INTRODUCTION TO HYDRAULIC POWER: Pascal’s law and
problems on Pascal’s Law, continuity equations, introduction to conversion
of units. Structure of Hydraulic Control System. The Source of Hydraulic
Power: Pumps Pumping theory, pump classification, gear pumps, vane
pumps, piston pumps, pump performance, pump selection. Variable
displacement pumps.
UNIT II:
HYDRAULIC ACTUATORS AND MOTORS: Linear Hydraulic
Actuators [cylinders], Mechanics of Hydraulic Cylinder loading, Hydraulic
Rotary Actuators, Gear motors, vane motors, piston motors, Hydraulic motor
theoretical torque, power and flow rate, hydraulic motor performance.
UNIT III:
CONTROL COMPONENTS IN HYDRAULIC SYSTEMS: Directional
Control Valves – Symbolic representation, Constructional features, pressure
control valves – direct and pilot operated types, flow control valves.
UNIT IV:
HYDRAULIC CIRCUIT DESIGN AND ANALYSIS: Control of single
and double – acting Hydraulic Cylinder, regenerative circuit, pump unloading
circuit, Double pump Hydraulic system, Counter Balance Valve application,
Hydraulic cylinder sequencing circuits. Locked cylinder using pilot check
valve, cylinder synchronizing circuits, speed control of hydraulic cylinder,
speed control of hydraulic motors, accumulators and accumulator circuits.
PART – B
UNIT V:
MAINTENANCE OF HYDRAULIC SYSTEMS: Hydraulic oils;
Desirable properties, general type of fluids, sealing devices, reservoir system,
filters and strainers, problem caused by gases in hydraulic fluids, wear of
moving parts due to solid particle contamination, temperature control, trouble
shooting.
UNIT VI:
INTRODUCTION TO PNEUMATIC CONTROL: Choice of working
medium, characteristics of compressed air. Structure of Pneumatic control
system. Pneumatic Actuators: Linear cylinders – Types, conventional type of
cylinder working, end position cushioning, seals, mounting arrangements
applications. Rod–less cylinders, types, working advantages. Rotary cylinder
types construction and application. Design parameters, selection.
UNIT VII:
DIRECTIONAL CONTROL VALVES: Symbolic representation as per
ISO 1219 and ISO 5599. Design and constructional aspects, poppet valves,
slide valves spool valve, suspended seat type slide valve. Simple Pneumatic
Control: Direct and indirect actuation pneumatic cylinders, use of memory
valve. Flow control valves and speed control of cylinders supply air throttling
and exhaust air throttling use of quick exhaust valve. Signal processing
elements: Use of Logic gates – OR and AND gates pneumatic applications.
Practical examples involving the sue of logic gates. Pressure dependent
controls types construction–practical applications. Time dependent controls –
Principle, construction, practical applications.
UNIT VIII:
MULTI-CYLINDER APPLICATIONS: Coordinated and sequential
motion control. Motion and control diagrams – Signal elimination methods.
Cascading method – principle. Practical application examples (up to two
cylinders) using cascading method (using reversing valves). Electro-
Pneumatic control: Principles-signal input and out put pilot assisted solenoid
control of directional control valves, use of relay and contactors. Control
circuitry for simple single cylinder applications. Compressed air: Production
of compressed air – compressors, preparation of compressed air- Driers,
Filters, Regulators, Lubricators, Distribution of compressed air- Piping
layout.
REFERENCE
TEXT BOOKS:
1. Fluid Power with applications, Anthony Esposito, Fifth edition
pearson education, Inc. 2000.
2. Pneumatics and Hydraulics, Andrew Parr. Jaico Publishing Co.
2000.
Reference Books
1. Oil Hydraulic Systems - Principles and Maintenance, S.R.
Majumdar, Tata Mc Graw Hill publishing company Ltd. 2001.
2. Pneumatic Systems, S.R. Majumdar, Tata Mc Graw Hill publishing
Co., 1995.
3. Industrial Hydraulics, Pippenger, Hicks, McGraw Hill, New York.