DESIGN OF HYDRAULIC AND
P N E U M AT I C S Y S T E M S
UNI T-I FLUI D P OW ER P RI NICIPLES AND
HYDRAULIC PUMPS
DEPARTMENT OF MECHANICAL ENGINEERING
COURSE OUTLINE
LEARNING OBJECTIVES
LECTURE
LECTURE TOPIC
KEY ELEMENTS
(2 to 3 objectives)
1
2
FLUID POWER PRINICIPLES AND
HYDRAULIC PUMPS
Introduction to Fluid power
Basics of Fluid Power.
Advantages and Applications
Practical Applications and
its uses in day today
practices.
Understanding of basics of fluid power
(B2)
Understanding of general applications.
(B2)
Apply law of Pascal (B3)
3
Fluid power systems
Elements of Fluid Power
systems
Understanding fluid power (B2)
4
Types of fluids
Classification of Fluids
Understanding the types of fluids (B2)
5
Properties of fluids and selection
Basic properties of fluids
Analysis of fundamental properties of
fluids (B3)
Analysis of suitable fluid for a particular
application (B3)
Remember Hydrostatic Law (B1)
6
Basics of Hydraulics
DEPARTMENT OF MECHANICAL ENGINEERING
Hydrostatic Law
Understanding of Hydrostatic law. (B2)
COURSE OUTLINE
LEARNING OBJECTIVES
LECTURE LECTURE TOPIC
KEY ELEMENTS
(2 to 3 objectives)
Remember Pascal’s Law (B1)
7
Pascal’s Law, Sources of Hydraulic
Pascal’s Law
power
Understanding of Pascal’s law.
(B2)
Analysis of forces (B4)
Understanding the types and
construction of pumps (B2)
8
Pump Classification – Construction Types, functions
9
Working
Working
10
Design
Design of pumps by
considering load,
speed, Efficiency and
no.of impellers.
11
Advantages
Uses of Pumps
Understanding the advantages
(B2)
Disadvantages
Negative aspects of
pumps, inappropriate
selection causes.
Understanding the
disadvantages (B2)
12
DEPARTMENT OF MECHANICAL ENGINEERING
Understanding the working of
fluid Pumps (B2)
Analysis of forces in ram and
plunger (B4)
UNIT SYLLABUS
Introduction to Fluid power – Advantages and Applications – Fluid
power systems – Types of fluids - Properties of fluids and selection –
Basics of Hydraulics – Pascal’s Law, Sources of Hydraulic power,
Pump Classification – Construction, Working, Design, Advantages,
and Disadvantages.
DEPARTMENT OF MECHANICAL ENGINEERING
INTRODUCTION
Fluid power:
• Technology that deals with generation, control and transmission of
power, using pressurised fluids.
• Fluid power is used to push, pull, regulate or drive virtually all the
machines of modern industries.
Ex: Hydraulic jack, Hydraulic brake, power steering, drive machine
tools, robots, control aeroplanes
DEPARTMENT OF MECHANICAL ENGINEERING
• Fluid transport – sole objective is to deliver fluid from one location
to another to accomplish some useful purpose
• Ex: pumping
stations
for
cross country gas lines
pumping
water to
homes,
• Liquids (hydraulics) – incompressible – high
• pressure application – high force and torque –
precision
• Have definite mass and volume
liquid
accuracy and
Volume is equal to volume of
• Gases (pneumatics) – compressible – low pressure applications –
low force and torque – low accuracy and precision
• Have definite mass but not volume
• Volume depends on pressure & temperature
DEPARTMENT OF MECHANICAL ENGINEERING
ADVANTAGE
• Fluid power systems are simple, easy to operate and can be
controlled accurately:
• Multiplication and variation of forces:
• Multifunction control
• Constant force or torque
• Low weight to power ratio
DEPARTMENT OF MECHANICAL ENGINEERING
APPLICATIONS
• Automation-Automated transfer machine
• Aviation-Landing wheels on planes
• Industry-Drills, grinders, rivertting machine
• Construction equipment-Excavators, bucket loader, dozers
DEPARTMENT OF MECHANICAL ENGINEERING
DRAWBACKS
• Oils are messy
• Leakage is impossible
• Hydraulic lines can burst
• Noise from pumps
• Fire at hot atmosphere
• Compressed air tanks are explosive
DEPARTMENT OF MECHANICAL ENGINEERING
FLUID POWER SYSTEM
PRIME
MOVER
Hydraulic
pump
Hydraulic
circuit
Hydraulic
actuator
External
load
Reservoir
• A tank ( reservoir ) to hold the hydraulic oil
• A pump to force the oil through the system
• An electric motor or other power source to drive the pump
• Valves to control oil direction, pressure and flow rate
• An actuator to convert the pressure of the oil to do useful work
• Piping
DEPARTMENT OF MECHANICAL ENGINEERING
TYPES OF HYDRAULIC FLUID
• Water- Inexpensive, corrosive, no lubricity
• Petroleum oil- Excellent lubricity, tendency to oxidise
• Water glycol- Water and glycol,35-55% of water,
resistance, not good for high bearing load.
good fire
• Water oil emulsion- contains 40% of water, good fire resistance,
inexpensive.
DEPARTMENT OF MECHANICAL ENGINEERING
PRIMARY FUNCTION OF
HYDRAULIC FLUID
• Transmit power
• Lubricate moving part
• Seal clearances between mating parts
• Dissipate heat
• Compatible with hydraulic components
• Should bear physical & chemical changes
DEPARTMENT OF MECHANICAL ENGINEERING
PROPERTIES OF HYDRAULIC
FLUID
• Good lubrication
• Ideal viscosity
• Chemical stability
• Compatibility with system materials
• High degree of incompressibility
• Fire resistance
• Good heat-transfer capability
• Low density
• Foam resistance
• No toxicity
• Low volatility
DEPARTMENT OF MECHANICAL ENGINEERING
SELECTION OF HYDRAULIC
FLUID
• 1.
Stable viscosity characteristics
• 2.
Good lubricity
• 3.
Compatibility with system materials
• 4.
Stable physical and chemical properties
• 5.
Good heat dissipation capability
• 6.
High bulk modulus and degree of incompressibility
• 7.
Good flammability
• 8.
Low volatility
• 9.
Good demulsibility
• 10. Better fire resistance
• 11. Non toxicity and good oxidation stability
• 12. Better rust and corrosion prevent qualities
• 13. Ready availability and inexpensive
DEPARTMENT OF MECHANICAL ENGINEERING
BASICS OF HYDRAULICS
FLUID FLOW:
DEPARTMENT OF MECHANICAL ENGINEERING
PASCAL'S LAW
• Pascal's law states
that pressure exerted anywhere in a
confined incompressible fluid is transmitted equally in all directions
throughout the fluid.
DEPARTMENT OF MECHANICAL ENGINEERING
• P1 = P2 (since the pressures are equal throughout).
• Since pressure equals force per unit area, then it follows that
𝐹1 𝐹2
=
𝐴1 𝐴2
Because the volume of fluid pushed down on the left side equals the
volume of fluid that is lifted up on the right side, the following
formula is also true.
V1 = V2
by substitution,
A1 D1 = A2 D2
A = cross sectional area
D = the distance moved
A1/A2=D2/D1
DEPARTMENT OF MECHANICAL ENGINEERING
SOURCES OF HYDRAULIC
POWER
Power unit & Pumps:
• Prime mover to power the system
• Pump to move fluid
• Reservoir to store fluid
• Relief valve or pup compensator or to control maximum system
pressure
• Filter to clean the fluid
• Plumbing to transport fluid to components
DEPARTMENT OF MECHANICAL ENGINEERING
PUMP
• Converts Mechanical Energy to Hydraulic Energy
• Pump pushes the fluid into the hydraulic system.
• It is the heart of any hydraulic system because it generates the
force necessary to move the load.
• Mechanical energy is delivered to the pump using a prime mover
such as an electric motor.
• Partial vacuum is created at the inlet due to the mechanical
rotation of pump shaft.
• Vacuum permits atmospheric pressure to force the fluid through
the inlet line and into the pump.
 The pump then pushes the fluid mechanically into the fluid power
actuated devices such as a motor or a cylinder.
DEPARTMENT OF MECHANICAL ENGINEERING
PUMPING THEORY
DEPARTMENT OF MECHANICAL ENGINEERING
POSITIVE DISPLACEMENT
PUMP
• In a positive-displacement pump, slippage is negligible compared
to the pump's volumetric output flow.
• If the output port were plugged, pressure would increase
instantaneously to the point that the pump's pumping element or
its case would fail (probably explode, if the drive shaft did not
break first).
• Universally used for Fluid Power.
• It push a fixed amount of fluid into the Hydraulic System per
revolution of shaft
• Gear, Vane, Piston are the examples of Positive Displacement
Pump
• It is important to note that pumps create flow not pressure.
Pressure is created by the resistance to flow
DEPARTMENT OF MECHANICAL ENGINEERING
NON-POSITIVE DISPLACEMENT
PUMP
• It produces a continuous flow.
• It does not provide a positive internal seal against slippage.
• Output varies considerably as pressure varies. If the output port
the pump were blocked off, the pressure would rise, and output
would decrease to zero.
• Although the pumping element would continue moving, flow would
stop because of slippage inside the pump.
• Centrifugal and propeller pumps are examples of non-positivedisplacement pumps.
DEPARTMENT OF MECHANICAL ENGINEERING
CLASSIFICATION OF POSITIVE
DISPLACEMENT PUMPS
1.Gear Pumps
a. External gear pumps
b. Internal gear pumps
c. Lobe pumps
d. Screw Pumps
2.Vane Pumps
a. Unbalanced Vane Pumps
b. Balanced Vane Pumps
3.Piston Pumps
a. Axial Design
b. Radial Design
DEPARTMENT OF MECHANICAL ENGINEERING
EXTERNAL GEAR PUMPS
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
PUMP DESIGN, OPERATION, AND
APPLICATION
DEPARTMENT OF MECHANICAL ENGINEERING
• Pumping action of gear pumps results from unmeshing and
meshing of the gears
• As the gears unmesh in the inlet area, low pressure causes fluid to
enter the pump
• As the pump rotates, fluid is carried to the pump discharge area
• When the gears mesh in the discharge area, fluid is forced out of
the pump into the system
• Gear pumps are available in a wide variety of sizes
• Flow outputs from below 1 gpm to 150 gpm
• Pressure rating range up to 3000 psi
DEPARTMENT OF MECHANICAL ENGINEERING
INTERNAL GEAR PUMP
• The main gear is keyed to the drive shaft, and rotates concentric in the
pump casing.
• Idler is located on an eccentric pin on the front cover to rotate freely
and
• meshes with main gear when assembled.
• A crescent shaped partition precision machined on the front cover
maintains a
• small, but positive clearance to achieve perfect scaling between parts.
• As the gears come out of mesh, a partial vacuum is created, forcing
the fluid to rush into the pump casing and fill in the voids between the
teeth.
• Both gears rotating in the same direction of rotation gently transfer the
fluid to the delivery port. The resulting action is a smooth-steady flow;
low in pulsation, noise and vibration
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
ADVANTAGES
• Only two moving parts
• Non-pulsating discharge
• Excellent for high-viscosity liquids
• Constant and even discharge regardless of pressure conditions
• Operates well in either direction
• Single adjustable end clearance
• Easy to maintain
DEPARTMENT OF MECHANICAL ENGINEERING
LOBE PUMP
DEPARTMENT OF MECHANICAL ENGINEERING
GEOROTOR PUMP
DEPARTMENT OF MECHANICAL ENGINEERING
SCREW PUMP
DEPARTMENT OF MECHANICAL ENGINEERING
• Advantage:
• It has very smooth flow,
• Flow from the outlet is smooth and continuous.
• Disadvantage: screw pumps are not highly efficient.
This design pump often is used to supercharge other pumps, as a
filter pump, or a transfer pump at low pressure.
DEPARTMENT OF MECHANICAL ENGINEERING
UNBALANCED VANE PUMP
DEPARTMENT OF MECHANICAL ENGINEERING
BALANCED VANE PUMP
DEPARTMENT OF MECHANICAL ENGINEERING
Advantages of balanced vane pump
• Permits higher operating pressures as the balanced design of pump eliminates the bearing side
loads.
• Balanced vane pumps have much improved services lives over simpler unbalanced
• vane pumps.
Disadvantages of balanced vane pump
• Balanced vane pumps are fixed displacement machines and so the displacement cannot be
varied.
• The balanced vane pumps are difficult to design as variable displacement pump
• because of its symmetrical construction.
Advantages of vane pump
• Vane pumps give constant delivery for a set rotor speed.
• Vane pumps are robust, self-priming.
• Vane pump provides uniform discharge with negligible pulsations.
• Vane pump vanes are self-compensating for wear.
• The vanes can be easily replaced..
• They occupy lesser space
DEPARTMENT OF MECHANICAL ENGINEERING
RADIAL PISTON PUMP
DEPARTMENT OF MECHANICAL ENGINEERING
DESIGN OF HYDRAULIC AND
P N E U M AT I C S Y S T E M S
U N I T - I I H Y D R A U L I C A C T U AT O R S A N D C O N T R O L
COMPONENTS
DEPARTMENT OF MECHANICAL ENGINEERING
COURSE OUTLINE
LEARNING OBJECTIVES
LECTUR
E
LECTURE TOPIC
1
HYDRAULIC ACTUATORS AND CONTROL
COMPONENTS
Hydraulic Actuators: Cylinders
Basic functions
Understanding functions of actuators (B2)
2
Types and construction
Classification
Understanding the types & constructions of
actuators (B2)
3
Application
Real world application
Apply in real world systems (B3)
4
Hydraulic cushioning
Load Vs operating Pressure
Understanding load Vs Pressure (B2)
Continuous rotary actuators
5
Hydraulic motors
Understanding the types of hydraulic
motors (B2)
KEY ELEMENTS
(2 to 3 objectives)
Semi rotary actuators
6
Control Components : Direction Control
DEPARTMENT OF MECHANICAL ENGINEERING
Function of DC Valve &
working
Understanding direct control valves (B2)
COURSE OUTLINE
LEARNING OBJECTIVES
LECTUR
E
LECTURE TOPIC
7
Flow control Valve
Function of FC Valve &
working
Understanding flow control valves (B2)
8
Pressure control valves
Function of PC Valve &
working
Understanding pressure control valves (B2)
9
Types
Classifications
Understanding the types of valves (B2)
10
Construction and Operation
Working and its components
Understanding the Construction and
Operation
(B2)
11
Servo and Proportional valves
Working and its components
Understanding the Construction and
Operation
(B2)
12
Servo and Proportional valves
Working and its components
Understanding the Servo and Proportional
valves (B2)
KEY ELEMENTS
(2 to 3 objectives)
DEPARTMENT OF MECHANICAL ENGINEERING
SYLLABUS
Hydraulic Actuators: Cylinders – Types and construction, Application,
Hydraulic cushioning – Hydraulic motors - Control Components:
Direction Control, Flow control and pressure control valves – Types,
Construction and Operation – Servo and Proportional valves.
DEPARTMENT OF MECHANICAL ENGINEERING
DIFFERENCE BETWEEN PUMP AND
ACTUATOR
• Pump performs the function of adding energy to the fluid of a
hydraulic system for transmission to some other location.
• Hydraulic actuator (cylinders, motors) just do the opposite.
• They extract energy from the fluid and convert it to mechanical
energy to perform useful work.
DEPARTMENT OF MECHANICAL ENGINEERING
HYDRAULIC ACTUATORS
It is a device used for converting hydraulic energy into mechanical
energy. The pressurized hydraulic fluid delivered by the hydraulic
pump is supplied to the actuators, which converts the energy of the
fluid into mechanical energy. This mechanical energy is used to get
the work done.
TYPES OF ACTUATORS:
• Linear Actuators (Hydraulic cylinders)
• Rotary Actuators (Hydraulic motors)
1. Continuous rotary actuators
2. Semi rotary actuators
DEPARTMENT OF MECHANICAL ENGINEERING
HYDRAULIC CYLINDER
A hydraulic cylinder is a device, which converts fluid power into linear
mechanical force and motion. It usually consists of a movable
element, a piston and a piston rod operating within a cylinder bore.
TYPES OF HYDRAULIC CYLINDERS:
1.
Single acting cylinders
2.
Double acting cylinders
3.
Telescoping cylinders
4.
Double rod cylinder
5.
Tandem cylinder
DEPARTMENT OF MECHANICAL ENGINEERING
DOUBLE ROD CYLINDER
DEPARTMENT OF MECHANICAL ENGINEERING
GRAPHIC SYMBOLS FOR
LINEAR ACTUATORS
DEPARTMENT OF MECHANICAL ENGINEERING
SINGLE-ACTING CYLINDERS
DEPARTMENT OF MECHANICAL ENGINEERING
DOUBLE-ACTING CYLINDER
A PISTON ROD ON ONE SIDE
DEPARTMENT OF MECHANICAL ENGINEERING
PISTON ROD ON BOTH SIDES
DEPARTMENT OF MECHANICAL ENGINEERING
TELESCOPIC CYLINDER
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
TANDEM CYLINDER
DEPARTMENT OF MECHANICAL ENGINEERING
GRAPHIC SYMBOLS FOR
LINEAR ACTUATORS
DEPARTMENT OF MECHANICAL ENGINEERING
HYDRAULIC CUSHIONING
As long as the piston is moving in the middle range of the cylinder,
nothing will hit the piston head. But, due to the inertia forces of the
moving parts at the end of the piston travel, the piston will hit the
cylinder head at full speed. To overcome this, the designers provide
a cushioning arrangement by which the hydraulic cylinder can be
slowly retarded or cushioned, during the last portion of the stroke.
DEPARTMENT OF MECHANICAL ENGINEERING
HYDRAULIC MOTORS
A hydraulic motors converts fluid power into mechanical power in the
form of rotational motion. Motors perform the opposite function of the
pump, which converts mechanical power from an electric motor or
engine into fluid power. Motors take pump flow and pressure as their
input and output rotational motion and torque.
• GEAR MOTOR
• VANE MOTORS
• PISTON TYPE MOTORS
DEPARTMENT OF MECHANICAL ENGINEERING
GEAR MOTOR
DEPARTMENT OF MECHANICAL ENGINEERING
VANE MOTORS
DEPARTMENT OF MECHANICAL ENGINEERING
PISTON TYPE MOTORS
Swash plate or bent axis type:
Swash Plate
Type
DEPARTMENT OF MECHANICAL ENGINEERING
Bent Axis Type
CONTROL COMPONENTS
A fluid power system can be broken down into three segments. The
power input segment consisting of the prime mover and the pump.
The control segment consisting of valves that control the direction,
pressure and flow rate. The power output segment, consisting of the
actuators and the load.
1.
Directional control valves
2.
Pressure control valves
3.
Flow control valves
DEPARTMENT OF MECHANICAL ENGINEERING
VALVE CONFIGURATION
POPPET OR SEAT VALVES
ROTARY SPOOL
VALVES
SLIDING SPOOL VALVES
DEPARTMENT OF MECHANICAL ENGINEERING
DIRECTIONAL CONTROL
VALVES
These valves are used to control the direction of flow in a hydraulic
circuit. According to the construction of internal moving parts it is
classified as poppet type and sliding spool type. It may be further
classified as one way, two way, three way and four way valves,
depending upon the number of port connections available. On the
basis of actuating devices, it can be classified as manually operated,
mechanically operated, solenoid operated and pilot operated.
• CHECK VALVES
• PILOT OPERATED CHECK VALVE
• TWOWAY DIRECTIONAL CONTROL VALVE
• THREE WAY DIRECTION CONTROL VALVES
• FOUR WAY DIRECTIONAL CONTROL VALVES
DEPARTMENT OF MECHANICAL ENGINEERING
CHECK VALVES
Application of Check Valve
DEPARTMENT OF MECHANICAL ENGINEERING
PILOT OPERATED CHECK
VALVE
DEPARTMENT OF MECHANICAL ENGINEERING
TWOWAY DIRECTIONAL
CONTROL VALVE
Two way, Two position normally
closed DCV
DEPARTMENT OF MECHANICAL ENGINEERING
Application of Two way DCV
valves
DEPARTMENT OF MECHANICAL ENGINEERING
THREE WAY DIRECTION
CONTROL VALVES
Three way, Two position
normally closed DCV
DEPARTMENT OF MECHANICAL ENGINEERING
Application of Three Way
Two Position DCV
(A) Extend Cylinder (B) Hold Cylinder (C) Retract Cylinder
Application of Three way three position DCV
DEPARTMENT OF MECHANICAL ENGINEERING
FOUR WAY DIRECTIONAL
CONTROL VALVES
Four way, Two position DCV
DEPARTMENT OF MECHANICAL ENGINEERING
Application of Four way, Two
position DCV
Four way, Three position DCV
DEPARTMENT OF MECHANICAL ENGINEERING
DIRECTIONAL CONTROL
VALVEACTUATION
• Various methods used to shift
the valve are shown in Figure.
All shown controlling a spring
return four way two position
valve. Manual lever is a
popular method of actuation
for DCVs used in mobile
equipment applications such
as back hoes, bulldozers and
farm equipment. Push button
actuation is more prevalent in
industrial applications.
DEPARTMENT OF MECHANICAL ENGINEERING
PRESSURE CONTROL VALVES
The force of a cylinder is
proportional to the pressure in a
system and the area over which
the
pressure
is
applied.
Controlling the pressure level in a
circuit will therefore allow us to
control the output force of a
cylinder pressure control valves
control the max pressure level
and also protect the circuit from
excessive pressure, which could
damage
components
and
possibly cause serious injury.
Some types of pressure control
valves simply react to pressure
changes rather than control the
pressure.
DEPARTMENT OF MECHANICAL ENGINEERING
PRESSURE RELIEF VALVES:
1 Direct acting pressure relief
valve
2 Pilot operated pressure relief
valve
• UNLOADING VALVES
• PRESSURE REDUCING
VALVE
• SEQUENCE VALVES
• COUNTER BALANCE VALVES
• BRAKE VALVES
DIRECT ACTING PRESSURE
RELIEF VALVE
DEPARTMENT OF MECHANICAL ENGINEERING
PILOT OPERATED PRESSURE
RELIEF VALVE
A- Pilot operated pressure relief
valve -Closed
DEPARTMENT OF MECHANICAL ENGINEERING
B- Pilot operated pressure relief
valve- Open
UNLOADING VALVES
A- Symbol comparison
Unloading Valve
B - Unloading Valve Circuit
DEPARTMENT OF MECHANICAL ENGINEERING
PRESSURE REDUCING VALVE
Symbol comparison
Pressure reducing valve
DEPARTMENT OF MECHANICAL ENGINEERING
Pressure Reducing Valve Application
DEPARTMENT OF MECHANICAL ENGINEERING
SEQUENCE VALVES
DEPARTMENT OF MECHANICAL ENGINEERING
Sequence Valve for Tube Bending
Machine
DEPARTMENT OF MECHANICAL ENGINEERING
COUNTER BALANCE VALVES
Counterbalance Circuit
DEPARTMENT OF MECHANICAL ENGINEERING
BRAKE VALVES
Brake Valve In Winch
Application
DEPARTMENT OF MECHANICAL ENGINEERING
FLOW CONTROL VALVES
Flow control valves control the flow rate of fluid in a circuit. They
accomplish this by incorporating a variable orifice into the circuit that
acts like a faucet; closing the flow control valve orifice reduces the
flow rate and opening the orifice increases the flow rate. The speed
of an actuator depends directly upon the flow rate in the system.
Controlling the flow rate therefore allows us to control the speed of
actuators. A variable displacement pump’s flow output can be varied,
even while it is being driven at a constant speed. This will also
control the actuator’s speed. In spite of this, flow control valves are
commonly used because they are much less expensive and easier to
control than variable pumps.
Types
• 1. Needle flow control valve
• 2. Pressure compensated flow control valve
DEPARTMENT OF MECHANICAL ENGINEERING
NEEDLE FLOW CONTROL VALVE
Needle Valve
DEPARTMENT OF MECHANICAL ENGINEERING
Needle Valve with Integral
Check Valve
PRESSURE COMPENSATED
FLOW CONTROL VALVE
DEPARTMENT OF MECHANICAL ENGINEERING
METER-IN FLOW CONTROL
Cylinders with Meter-In Flow Control
DEPARTMENT OF MECHANICAL ENGINEERING
METER-OUT FLOW CONTROL
Cylinders with Meter-Out Flow
Control
DEPARTMENT OF MECHANICAL ENGINEERING
BLEED-OFF CONTROL VALVE
Cylinders with Bleed- Off
Control
DEPARTMENT OF MECHANICAL ENGINEERING
FLOW DIVIDER
Outlet 1
DEPARTMENT OF MECHANICAL ENGINEERING
Outlet 2
DESIGN OF HYDRAULIC AND
P N E U M AT I C S Y S T E M S
UNI T-III HY DRAULI C CI RCUI TS AND S Y S TEMS
DEPARTMENT OF MECHANICAL ENGINEERING
COURSE OUTLINE
LEARNING OBJECTIVES
LECTURE
LECTURE TOPIC
KEY ELEMENTS
(2 to 3 objectives)
1
2
HYDRAULIC CIRCUITS AND
SYSTEMS
Accumulators
Intensifiers
Types & Function
Understanding the types &
functions of accumulators (B2)
Types & function
Understanding the types &
functions of intensifiers (B2)
Understanding the Industrial
hydraulic circuits
( B2)
3
Industrial hydraulic circuits
4
Regenerative pump
Working & Function
Understanding the regenerative
pump (B2)
5
Pump Unloading
Need of unloading a
pump
Understanding pump unloading
(B2)
Analyze pump unloading (B4)
6
Double-Pump
Working of a double
acting pump
Understanding of working of
double acting pump (B2)
DEPARTMENT OF MECHANICAL ENGINEERING
COURSE OUTLINE
LEARNING OBJECTIVES
LECTURE
LECTURE TOPIC
KEY ELEMENTS
(2 to 3 objectives)
7
Pressure Intensifier
Working of pressure
intensifier
Understanding of working of
pressure intensifier (B2)
8
Air-over oil, Sequence
Air-over oil circuit,
Layout
Analyze the air over oil
sequence (B3)
9
Reciprocation &
Synchronization
Single/double acting
reciprocation & Sync.
Understanding the working of
single /double acting
reciprocating pump (B2)
10
Fail-Safe
Need of fail safe
Analyses the fail safe system
of valves (B4)
11
Speed Control
Speed regulation
Analyze the speed control
mechanism(B4)
12
Hydrostatic transmission,
Mechanical hydraulic servo
systems.
Transmission &
Mechanical Servo
Systems
Understanding the
transmission & MH servo
systems(B2)
DEPARTMENT OF MECHANICAL ENGINEERING
SYLLABUS
Accumulators, Intensifiers,
Industrial
hydraulic
circuits
–
Regenerative, Pump Unloading, Double-Pump, Pressure Intensifier,
Air-over oil, Sequence, Reciprocation, Synchronization, Fail-Safe,
Speed Control, Hydrostatic transmission, Mechanical hydraulic servo
systems.
DEPARTMENT OF MECHANICAL ENGINEERING
ACCUMULATORS
Accumulators are devices that store hydraulic fluid under pressure.
Storing hydraulic fluid under pressure is a way of storing energy for
later use. Perhaps the most common application for an accumulator
is supplementing the pump flow in a hydraulic system in which a high
flow rate is required for a brief period of time.
Types
• Weight loaded accumulator
• Spring loaded accumulator
• Piston type
• Bladder type
• Diaphragm type
DEPARTMENT OF MECHANICAL ENGINEERING
WEIGHT LOADED
ACCUMULATOR
DEPARTMENT OF MECHANICAL ENGINEERING
SPRING LOADED
ACCUMULATOR
DEPARTMENT OF MECHANICAL ENGINEERING
PISTON TYPE
ACCUMULATOR
DEPARTMENT OF MECHANICAL ENGINEERING
BLADDER TYPE
DEPARTMENT OF MECHANICAL ENGINEERING
DIAPHRAGM ACCUMULATOR
DEPARTMENT OF MECHANICAL ENGINEERING
APPLICATIONS OF
ACCUMULATORS
Accumulators are used as
• Leakage compensator
• Auxiliary power source
• Emergency power source
• Hydraulic shock absorber
• Fluid make-up device
DEPARTMENT OF MECHANICAL ENGINEERING
ACCUMULATOR AS
LEAKAGECOMPENSATOR
DEPARTMENT OF MECHANICAL ENGINEERING
ACCUMULATOR AS AUXILIARY
POWER SOURCE
DEPARTMENT OF MECHANICAL ENGINEERING
ACCUMULATOR AS
EMERGENCY POWER SOURCE
DEPARTMENT OF MECHANICAL ENGINEERING
ACCUMULATOR AS HYDRAULIC
SHOCK ABSORBER
DEPARTMENT OF MECHANICAL ENGINEERING
INTENSIFIER
Single Acting Intensifiers
DEPARTMENT OF MECHANICAL ENGINEERING
INDUSTRIAL HYDRAULIC
CIRCUITS
• Pressure Intensifier Circuit
• AIR-OVER-OIL intensifier circuit
• Reciprocation
• FAIL-SAFE circuit
• Pump Unloading
• Double-Pump
• Sequence
• Synchronization
• Speed Control
• Hydrostatic transmission
• Mechanical hydraulic servo systems
DEPARTMENT OF MECHANICAL ENGINEERING
PRESSURE INTENSIFIER
CIRCUIT
DEPARTMENT OF MECHANICAL ENGINEERING
AIR-OVER-OIL INTENSIFIER
CIRCUIT
DEPARTMENT OF MECHANICAL ENGINEERING
REGENERATIVE CIRCUIT
DEPARTMENT OF MECHANICAL ENGINEERING
RECIPROCATION
• AUTOMATIC CYLINDER RECIPROCATING SYSTEM
DEPARTMENT OF MECHANICAL ENGINEERING
FAIL-SAFE CIRCUIT
• Two Handed Safety Control Circuit
DEPARTMENT OF MECHANICAL ENGINEERING
PUMP UNLOADING
DEPARTMENT OF MECHANICAL ENGINEERING
DOUBLE PUMP
DEPARTMENT OF MECHANICAL ENGINEERING
SEQUENCE
DEPARTMENT OF MECHANICAL ENGINEERING
SYNCHRONIZATION
• SYNCHRONIZING HYDRAULIC CYLINDERS
DEPARTMENT OF MECHANICAL ENGINEERING
SPEED CONTROL
DEPARTMENT OF MECHANICAL ENGINEERING
HYDROSTATIC TRANSMISSION
DEPARTMENT OF MECHANICAL ENGINEERING
MECHANICAL HYDRAULIC
SERVO SYSTEMS
DEPARTMENT OF MECHANICAL ENGINEERING
DESIGN OF HYDRAULIC AND
P N E U M AT I C S Y S T E M S
U N I T - I V P N E U M AT I C A N D E L E C T R O P N E U M AT I C
SYSTEMS
DEPARTMENT OF MECHANICAL ENGINEERING
COURSE OUTLINE
LEARNING OBJECTIVES
LECTURE
LECTURE TOPIC
KEY ELEMENTS
(2 to 3 objectives)
1
PNEUMATIC AND ELECTRO
PNEUMATIC SYSTEMS
Properties of air
Basics of properties of
air
Understanding of basic
properties of air (B2)
Remembering ideal gas
laws(B1)
Understanding the types &
functions of intensifiers (B2)
2
Perfect Gas Laws
Ideal Gas laws
3
Compressor – Filters
Air compressor filters
Understanding the compressor
filters (B2)
4
Regulator
Working & Function
Understanding the Working &
Function of regulator(B2)
5
Lubricator
Function of lubricator
Remember the lubrication
properties (B1)
Understanding the lubricator(B2)
6
Muffler
Muffler function
Working of a muffler
Understanding of working of
muffler (B2)
DEPARTMENT OF MECHANICAL ENGINEERING
COURSE OUTLINE
LECTUR
E
LEARNING OBJECTIVES
LECTURE TOPIC
KEY ELEMENTS
(2 to 3 objectives)
1
Air control Valves
2
Quick Exhaust Valves
Working and
Understanding of working of
function of air control
AC valves (B2)
valves
Exhaust Valves
Understanding of quick
return valves( B2)
3
Pneumatic actuators
Pneumatic actuators
Understanding the working
and function of Pneumatic
actuators (B2)
4
Design of Pneumatic circuit
Design of Industrial
Pneumatic circuit
Create the pneumatic circuit
for industries (B6)
5
Cascade method
Cascade system
Create cascade mechanism
for industrial circuits (B6)
6
Electro Pneumatic System
Function of Electro
pneumatic system
Understanding the Electro
Pneumatic System (B2)
DEPARTMENT OF MECHANICAL ENGINEERING
SYLLABUS
Properties of air – Perfect Gas Laws – Compressor – Filters,
Regulator, Lubricator, Muffler, Air control Valves, Quick Exhaust
Valves, Pneumatic actuators, Design of Pneumatic circuit – Cascade
method – Electro Pneumatic System.
DEPARTMENT OF MECHANICAL ENGINEERING
PROPERTIES OF AIR
The properties of air are:
1. Air takes up space.
2. Air has mass.
3. Air is affected by heat.
4. Air exerts pressure.
5. Air can be compressed
6. Air is affected by altitude.
DEPARTMENT OF MECHANICAL ENGINEERING
PERFECT GAS LAWS
The three fundamental gas laws discover the relationship of
pressure, temperature, volume and amount of gas. Boyle's Law tells
us that the volume of gas increases as the pressure decreases.
Charles' Law tells us that the volume of gas increases as the
temperature increases. And Avogadro's Law tell us that the volume of
gas increases as the amount of gas increases. The ideal gas law is
the combination of the three simple gas laws.
• Ideal Gases
• Real Gases
• Boyle's Law
• Charles' Law
• Avogadro's Law
DEPARTMENT OF MECHANICAL ENGINEERING
COMPRESSOR
DEPARTMENT OF MECHANICAL ENGINEERING
FILTER REGULATOR
LUBRICATOR
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
MUFFLER
DEPARTMENT OF MECHANICAL ENGINEERING
AIR CONTROL VALVES
DEPARTMENT OF MECHANICAL ENGINEERING
QUICK EXHAUST VALVES
DEPARTMENT OF MECHANICAL ENGINEERING
PNEUMATIC ACTUATORS
DEPARTMENT OF MECHANICAL ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
DESIGN OF PNEUMATIC
CIRCUITS
DEPARTMENT OF MECHANICAL ENGINEERING
ELECTRO PNEUMATIC SYSTEM
DEPARTMENT OF MECHANICAL ENGINEERING