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Millwright 3rd year 2021 > Hydraulic pumps & Actuator A > Flashcards

Hydraulic pumps & Actuator A Flashcards

1
Q

non positive pump that has an impeller that throws the fluid away from inlet by centrifugal force

A

centrifugal or radial flow pump

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2
Q

non positive pump which uses a propeller to move fluid axially from its inlet to the discharge

A

propeller pump

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3
Q

amount of leakage in positive displacement pump

A

5-15%

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4
Q

3 ways to change output of pumps

A
  • use a flow control and relief valve built into discharge passage
  • change the speed of the driver
  • use a variable displacement pump
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5
Q

4 types of piston pump

A

in line axial
bent axis
rotary piston
radial piston

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6
Q

part of in line axial piston pump

carries the piston

A

rotating cylinder block

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7
Q

part of in line axial piston pump

slides back and forth in the cylinder to take in and discharge fluid

A

piston

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8
Q

part of in line axial piston pump

supports the piston and allow them to slide on the surface of the swash place

A

shoe

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9
Q

part of in line axial piston pump

retracts the piston on the inlet stroke

A

retractor plate

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10
Q

part of in line axial piston pump

stationary is set at an angle to the axis of the pistons that slide on its surface

A

swash plate

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11
Q

part of in line axial piston pump

stationary and has ports that allow fluid to flow in and out of the cylinder

A

valve plate

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12
Q

the output of a piston pump can be varied by controlling the length of the stroke, in line axial piston pumps can be adjusted by change the angle of this

A

swash plate

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13
Q

axial piston pump

swashplate is supported by

A

yoke and pivots

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14
Q

spring setting on load sensing pump

A

200-400 psi

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15
Q

part of in line axial piston pump

pivots the yoke in needle bearing fitted in the case

A

pintles

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16
Q

advantage of bent axis pump to axial piston pump

A

withstand high vacuum

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17
Q

length of stroke on bent axis pump is based on

A

the angle between cylinder block and drive shaft

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18
Q

how to stop flow of rotary piston pump

A

move reaction ring so its centre around the cylinder block

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19
Q

component of rotary piston pump ports fluid in and out of the cylinder

A

pintle

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20
Q

the flow of radial piston pump is pass through

A

the cylinder

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21
Q

vane pump need to be sealed at the shaft at this end

A

drive end

22
Q

pumping elements of a vane pump

A

cam ring

rotor and vanes

23
Q

cam ring on the vane pump is eccentric

true or false

A

true

24
Q

unbalanced vane pump use a circular cam that is off centre

true or false

A

true

25
Q

the vanes are held against the cam in unbalanced vane pump by 2 forces

A

centrifugal force

hydraulic pressure

26
Q

balanced vane pump can be displaced by changing

A

the cam ring

27
Q

vane pump direction is determined by look at the pump from the

A

drive end

28
Q

when installing vanes, ensure that the trailing edge is on the side of the

A

feed notches

29
Q

orientation of rounded tipped vanes

A

either way

30
Q

swash plate control limits the maximum pressure in the system

A

pressure limiting compensator

31
Q

swash plate control regulates the flow to suit any given load

A

load sensing compensator

32
Q

moves swash plate to maximum angle in in-line axial piston

A

bias piston

33
Q

pump that has a cylinder block that rotates around a stationary shaft called a pintle

A

rotary piston pump

34
Q

how to increase stroke and flow in variable displacement rotary piston pump

A

moving reaction ring further off center

35
Q

difference between radial piston pump and piston pump

A

radial piston pump has stationary cylinder block

36
Q

vane pump with circular cam that is off center with respect to the rotor

A

unbalanced vane pump

37
Q

vane pump with ellipitical cam

A

balanced vane pump

38
Q

compact vane pump

A

balanced

39
Q

what determines amount of fluid displaced on each revolution in vane pump

A

thickness of cam ring

size of throws

40
Q

direction of rotation on vane pump is determined by what end

A

drive end

41
Q

trailing edge of vanes should be on this side

A

side of feed notches

42
Q

side rounded tip vanes need to be installed

A

any side

43
Q

bearings used on external gear pump to control radial loads

A

needle bearing

44
Q

gear on external gear pump with no axial thrust

A

herringbone

45
Q

gear on external gear with axial thrust

A

helical

46
Q

most quiet gear in external gear pump

A

herringbone

47
Q

advantage on internal gear pump

A

compact and quieter

48
Q

internal gear pump has less teeth on which gear

A

internal

49
Q

seal inside internal gear between inlet and outlet

A

crescent

50
Q

quietest gear pump and least dirt tolerant

A

geroter

Millwright 3rd year 2021 (21 decks)

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