The document discusses different types of pumps used in fluid flow creation and hydraulics applications. It distinguishes between positive displacement pumps, which displace a fixed volume of fluid per revolution, and non-positive displacement pumps, which use fluid inertia to displace fluid. The document goes on to describe various positive displacement pump types including gear pumps, vane pumps, piston pumps, and how their principles of operation differ. It also covers classifications such as fixed vs variable displacement and pressure compensation in pumps.

1. Creation of fluid flow : Pump
Objectives :
Distinguish between positive and non-positive
displacement pumps
Understand the principle of operation of gear, vane and
piston pumps
Differentiate between fixed and variable displacement
pumps, external and
internal gear pumps as well as axial and radial piston
pumps
Explain how pressure-compensated pumps work
Identify the various types of pumps used in hydraulics
Select and size pumps for various hydraulic applications
Carry out basic maintenance activities on the pumps.

2. Principle of operation

3. Pump classification
Positive displacement pumps. Non-positive displacement pumps and
ROTARY
RESIPROCATING
PISTON PUMP
GEAR PUMPSCREW PUMP
-INTERNAL
-EXTERNAL VANE PUMP
-GEROTER AXIAL
RADIAL PISTON
FIXED DISP. VARIABLE
STATIONARY STA. BENT AXIS INLINE
CYLINDER PISTON
BALANCED
UNBALANCE
VARIABLE SWASH PLATE CAMDRIVEN

4. Non-positive displacement pumps
hydro-dynamic pump
fluid is displaced and transferred using
the inertia of the fluid in motion
Low Initial Cost & maintenance cost
Operated quietly
All types of fluid like sludge and slurries
High reliability
Simplicity of operation

6. Positive displacement
hydrostatic pumps
pumps discharge a fixed quantity of oil per
revolution
Capability to generate high pressures
High volumetric efficiency
Small and compact with high power to weight ratio
Relatively smaller changes in efficiency throughout the
pressure range
Wider operating range i.e. the capability to operate over
a wide pressure and
speed range.

7. External gear pump

10. Internal gear pump

12. Lobe pump

13. Gerotor pump

16. Vane pumps

17. Balanced vane pump

19. Variable displacement vane
pump

24. Pressure compensation in
variable displacement vane
pumps

25. Simple circuit with variable
displacement pump.

26. Simple circuit with fixed
displacement pump

27. Piston pump
Bent-axis piston pumps