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Millwright 3rd year 2021 > Hydraulic Valves B > Flashcards

Hydraulic Valves B Flashcards

1
Q

valve mounted on top of a stack valve

A

DCV

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2
Q

valve mounted on sub plate on a stack valve

A

relief valve

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3
Q

valve mounted between top plate and sub plate on a stack valve

A

pilot operated check valve and flow control valve

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4
Q

symbol for pilot supply on a stack valve

A

X

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5
Q

symbol for pilot drain on a stack valve

A

Y

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6
Q

plate for unused section of stack valve

A

blanking plate

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7
Q

2 types of cartridge valve

A

slip in and screw in

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8
Q

cartridge valve for low flow circuits 30-35 GPM

A

screw in

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9
Q

cartridge valve for large flows over 30 GPM

A

slip in cartridge

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10
Q

what 2 specification determine whether a slip in cartridge opens

A

area ratio

pressure at each port

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11
Q

cartridge valve treated as throw away

A

screw in valve

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12
Q

cartridge valve can be repaired

A

slip in valve

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13
Q

diagonal lines on solenoid indicate

A

force can be variable

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14
Q

proportional or servo valve

more expensive, higher accuracy

A

servo valve

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15
Q

proportional or servo valve

more rugged and dirt tolerant

A

proportional valves

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16
Q

proportional spool movement is proportional to

A

electrical input

17
Q

electronic control used to control the electrical input to a solenoid

A

amp card

18
Q

notched spool are unique to this valve

A

proportional valve

19
Q

notched spools can control flow rate through

A

metering notches

20
Q

to minimize delay in flow, this control briefly boosts the power to make the spool jump quickly across the overlap distance

A

dead band compensation

21
Q

signal to ensure the spool moves freely

A

dither

22
Q

function to control acceleration and deceleration

A

ramp

23
Q

cannot sense how accurately the actuator is responding to the control settings

A

open loop system (no feed back)

24
Q

sense the spool position and feeds the signal back to the summing junction in the amplifier

A

LVDT

25
Q

sends a signal to the controller to give it the position of the spool

A

closed inner loop system

26
Q

connects a position sensor on the actuator to the summing junction in the amplifier control

A

closed out loop system

27
Q

3 types of pressure controls on proportional valve

A

nozzle
plate
poppett

28
Q

pressure control on proportional valve for less than 1 gpm(pilot)

A

nozzle

29
Q

pressure control on proportional valve highly responsive and accurate

A

plate

30
Q

main components of a servo valve

A

torque motor and spool valve

31
Q

3 types of servo valve

A

flapper, nozzle, jet pipe

32
Q

term used to express how accurately the spool moves compared to the input current

A

hysteresis

33
Q

filter microns needed for servo valve

A

2-3 microns

34
Q

should a servo valve be repaired

A

no

Millwright 3rd year 2021 (21 decks)

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