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Millwright 3 > Hydraulic Valves A > Flashcards

Hydraulic Valves A Flashcards

1
Q

Relieves maximum pressure in a system in case of an overload

A

maximum pressure valve

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2
Q

Relives all pressure under normal operation

A

unloading valve

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3
Q

relief valve to handle small flows, accurate control of pressure is not important, quick acting

A

direct acting or simple relief valve

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4
Q

the difference between full flow pressure and cracking pressure

A

pressure overide

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5
Q

what is the pressure override if cracking pressure and full flow pressure is the same

A

0

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6
Q

relief valve for pressures above 500 psi, energy effiecient by minimizing pressure override, 20 psi light spring

A

pilot operated relief valve

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7
Q

unloading valve used in accumulator circuits

A

unloading relief valve

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8
Q

unloading valve installed in pressure line from the accumulator can serve to unload the system when the pump is shut down

A

on/off valve

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9
Q

unloading valves provides a means of unloading hydraulic system from remote location

A

vented relief valve

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10
Q

unloading valve used in high and low volume pump system. both pumps work to clamp workpiece and low pump maintains flow to develop high pressure for clamping

A

pilot operated unloading valve

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11
Q

valve used when one needs to operate only one branch of a circuit below the setting of the maximum pressure relief valve

A

pressure reducing valve

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12
Q

the sequence valve needs to be set higher or lower than the clamping pressure

A

lower

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13
Q

the sequence valve needs to be set higher or lower then the second cylinder

A

higher

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14
Q

drain type on counterbalance valve

A

internal

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15
Q

drain type on sequence valve

A

external

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16
Q

counterbalance valve are set higher or lower than pressure needed to hold load

A

higher

17
Q

valve installed on discharge of motor to prevent overspeeding when an overruning load is applied

A

brake valve

18
Q

internal/external pilot on brake valve allows oil to pass to start the load

A

internal

19
Q

internal/external pilot on brake valve stops the load from overruning

A

external

20
Q

flow path on DCV are called

A

ways

21
Q

valve position used for single acting cylinder, also to divert flow

A

3 way, 2 position

22
Q

DCV used to operate flows above 20-25 GPM

A

pilot operated DCV, or piggy back DCV

23
Q

pilot operated valve direct fluid to main valve at this PSI

A

75-100

24
Q

spool center locks cylinder but also allows pump to supply other valves

A

tandem center

25
Q

spool center shuts off pump flow but allows motors to coast freely without stopping it suddenly

A

float center or motor center

26
Q

check valve poppet used to handle higher flows

A

poppet style

27
Q

check valve poppet used to handler smaller flows

A

ball style

28
Q

check valve able to handle 3 times the flow

A

right angle check valve

29
Q

check valve commonly used to ensure accumulator is depressurized when pump is shut down

A

pilot to close

30
Q

3 flow control methods

A

meter in
meter out
bleed off

31
Q

metering method best used to push a load

A

meter in

32
Q

metering method best used to provide positive control for runnaway loads

A

meter out

33
Q

metering method most energy effiencient, does not provide accurate control or control for runaway loads

A

bleed off

34
Q

pressure compensators are also called

A

hydrostat

35
Q

2 types of pressure compensator

A

bypass

restrictor

36
Q

pressure compensator used in meter in only

can replace main relief valve

A

bypass compensator

37
Q

pressure compensator able to be used in meter in and meter out application

A

restrictor pressure

Millwright 3 (20 decks)

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