explanation regarding the working principles of all the types of hydraulic pumps?

Answer 1

Types of hydraulic pumps:
vane pump-single suction,double suction,fixed/variable capacity.
Gear pump-spur/helical/harringbone type.
piston pumps-axial/radial piston pumps.

How Vane Pumps Work:

Despite the different configurations, most vane pumps operate under the same general principle described below.

1. A slotted rotor or impeller is eccentrically supported in a cycloidal cam. The rotor is located close to the wall of the cam so a crescent-shaped cavity is formed. The rotor is sealed into the cam by two sideplates. Vanes or blades fit within the slots of the impeller. As the impeller rotates (yellow arrow) and fluid enters the pump, centrifugal force, hydraulic pressure, and/or pushrods push the vanes to the walls of the housing. The tight seal among the vanes, rotor, cam, and sideplate is the key to the good suction characteristics common to the Vane pumping principle.

2. The housing and cam force fluid into the pumping chamber through holes in the cam (small red arrow on the bottom of the pump). Fluid enters the pockets created by the vanes, rotor, cam, and sideplate.

3. As the impeller continues around, the vanes sweep the fluid to the opposite side of the crescent where it is squeezed through discharge holes of the cam as the vane approaches the point of the crescent (small red arrow on the side of the pump). Fluid then exits the discharge port.
http://www.pumpschool.com/principles/vane.htm
Piston pumps:
An axial piston pump has a number of pistons (usually an odd number) arranged in a circular array within a housing which is commonly referred to as a cylinder block, rotor or barrel. This cylinder block is driven to rotate about its axis of symmetry by an integral shaft that is, more or less, aligned with the pumping pistons (usually parallel but not necessarily).
http://en.wikipedia.org/wiki/Axial_piston_pump

Radial Piston Pump :
This is a still representation and possibly also a low-resolution image of a fully animated pump.
Radial Piston Pumps can produce a very smooth flow under extreme pressure. Generally they are variable-displacement pumps.
In variable models, flow rate changes when the shaft holding the rotating pistons is moved with relation to the casing (in different models either the shaft or the casing moves.) Output can also be varied by changing the rotation speed.
In this animation if the casing (shown in red) is moved to the left, the flow rate would decrease to zero. If it is moved even further to the left the flow would reverse.
Input in this animation is through the two black holes near the center below the "Pintle" (shown in yellow). Output is through the top two black holes, above the pintle. Higher pressure areas are indicated with a lighter blue fluid color.
The pistons are usually forced out by springs. They are forced back in, expelling liquid, by the casing.
An odd number of pistons is always used to smooth the hydraulic balance. These pumps revolve at speeds up to about 1200 RPM.
http://www.maintenanceresources.com/ReferenceLibrary/Pumps/radialpi.htm
For more details visit:
http://www.hydraulic-supply.com/html/productline/mfgprod/vickers-pumps.htm
VICKERS PUMPS ARE THE BEST HYDRAULIC PUMPS.

Answer 2

HYDRO belongs to water. Hydraulic pump works on drawing out the air content in the pump, where water is coming up, when again the piston draws, more water comes out, this repeated and flows out. Hydraulic pump is used not only for water, but various application, where the the pump works on watr pressure. - There are pumps works on air-pressure, oil-pressure and now even LPG has come for operation of certain pumps. Everywhere pump working principle is the same, but hydrauylic means water pressure

Answer 3

Step 1 Liquid drawn into pump by suction
Step 2 Liquid is squeezed out of pump

Step 3 Repeat Steps 1 & 2 as long as you want to pump liquid

Answer 4

There are differnt Types of hydraulic pumps. For pumping hydraulic oils there are Different types of pumps available. In which the most common types are "GEAR PUMP" , "VANE PUMP", "LOBE PUMP",and "SWASH PLATE BENT AXIS PUMPS"

http://en.wikipedia.org/wiki/Hydraulic_machinery#Pumps
VISIT THIS SITE FOR MORE INFORMATION