190301b hydraulic pump fun

Question 1

Are vane pumps balanced or unbalanced?

Answer 1

Depending on Cam style they will be balanced or un balanaced

Question 2

Hydraulic pumps convert what energies?

Answer 2

Mechanical energy to Hydraulic energy

Question 3

Where does a pump gets its power from?

Answer 3

Prime mover (internal combustion engine or electric motor

Question 4

What does a pump supply for our system?

Answer 4

Fluid flow

Question 5

What determines direction of rotation?

Answer 5

The mechanical energy source, the pump will be connected to it via a shaft

Question 6

On a gear pump how many drive gears are there?

Answer 6

one will be the drive from prime mover and the other will be driven

Question 7

Is pump displacement directly related to the pump’s internal volume?

Answer 7

Yes

Question 8

How do we express pump displacement?

Answer 8

cm³/rev or in³/rev

Question 9

Are gear pumps fixed displacement only?

Answer 9

Yes

Question 10

Describe fixed displacement?

Answer 10

pumping chamber will deliver the same amount of fluid with every revolution

Question 11

Is the input of a gear pump the low pressure side?

Answer 11

Yes

Question 12

Are all vane pumps fixed displacement?

Answer 12

No they can also be variable

Question 13

What are the three types of piston pumps?

Answer 13

Axial, Bent Axial and radial

Question 14

What must be included to make a vane pump variable displacement?

Answer 14

Displacement control and maximum volume adjustment, adjust circular cam position

Question 15

In an axial piston pump, are the pistons parallel or 90° to the drive shaft?

Answer 15

Pistons are parallel

Question 16

Are radial piston pump’s pistons parallel or 90° to the drive shaft?

Answer 16

90°

Question 17

What does maximum swash plate angle create in a piston pump?

Answer 17

The result is maximum flow

Question 18

Since a bent axis piston pump has no swash plate what needs to move to change displacement?

Answer 18

lens plate

rotating members

Question 19

What style of vans are needed to create a gradual start up?

Answer 19

Spring pressure on bottom of vane

Question 20

Generally what RPM does the vane pump need to rotate to use centrifugal force to push the vanes out?

Answer 20

600 RPM

Question 21

How many pieces of make up a vane pump house?

Answer 21

2 or 3 piece

Question 22

In a three piece vane pump house what is the middle piece?

Answer 22

The cam

Question 23

What are the two styles of cam rings in a vane pump?

Answer 23

Circular or elliptical

Question 24

What is used in a reversible gear pump to allow auto changes in flow direction?

Answer 24

Check balls

Question 25

What determines the amount of fluid flowing internally through a pump?

Answer 25

The pressure difference between inlet and outlet ports | The amount of internal clearance with the pump

Question 26

What limits the internal leakage in a external gear pump?

Answer 26

Pressure plates

Question 27

Rounded vane tips must be installed in the correct direction?

Answer 27

The direction of the rotor rotation does not change the way rounded vanes are installed

Question 28

What is generally the Volumetric efficiency of a external gear pump?

Answer 28

85-87% VE

Question 29

If you have a faulty shaft seal on a external gear pump, what would be the result?

Answer 29

Aeration

Question 30

What is the operator complaint if aeration is occurring?

Answer 30

Spongy operation

Question 31

Why do we need internal leakage in our pumps?

Answer 31

Lubricate all parts

Question 32

How do you determine the inlet port on an external gear pump?

Answer 32

Usually larger | Gears will be coming out of mesh

Question 33

Bi Directional Gear pumps can be installed what way?

Answer 33

In an application that is either clockwise or counter clockwise shaft rotation. (without performing any internal modifications)

Question 34

What is common on a bi direction gear pump? Hint: Ports

Answer 34

Ports are generally the same size

Question 35

What is the vane style that has a small cut away in it that allows pressure to act on the underside of the vane?

Answer 35

Intra Vane Design

Question 36

What pressure is applied to the intra vane?

Answer 36

Outlet pressure

Question 37

What are the holes in the cam on a vane pump called?

Answer 37

Transfer Slot Input

Question 38

What is on the back side of a pressure plate to provide pressure?

Answer 38

Outlet oil pressure | Some have a spring to apply force during start up

Question 39

To change direction on a uni directional pump what is required?

Answer 39

Disassemble the pump and re position internal components

Question 40

true or false? The greater the pressure difference between the pump's inlet and outlet port, the greater the amount of internal leakage?

Answer 40

True

Question 41

Define Slip

Answer 41

Oil leaking from the outlet side of a hydraulic pump to the inlet side

Question 42

What decreases when pump slip increases?

Answer 42

Efficiency decreases

Question 43

What can decrease volumetric efficiency?

Answer 43

too much pump wear, internal leakage increases

Question 44

How is overall efficiency determined?

Answer 44

Comparing input power to output power

Question 45

What is the pump style that can handle the most contamination?

Answer 45

External gear pumps