Hydraulic Valves A

Question 1

Relieves maximum pressure in a system in case of an overload

Answer 1

maximum pressure valve

Question 2

Relives all pressure under normal operation

Answer 2

unloading valve

Question 3

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

Answer 3

direct acting or simple relief valve

Question 4

the difference between full flow pressure and cracking pressure

Answer 4

pressure overide

Question 5

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

Answer 5

0

Question 6

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

Answer 6

pilot operated relief valve

Question 7

unloading valve used in accumulator circuits

Answer 7

unloading relief valve

Question 8

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

Answer 8

on/off valve

Question 9

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

Answer 9

vented relief valve

Question 10

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

Answer 10

pilot operated unloading valve

Question 11

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

Answer 11

pressure reducing valve

Question 12

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

Answer 12

lower

Question 13

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

Answer 13

higher

Question 14

drain type on counterbalance valve

Answer 14

internal

Question 15

drain type on sequence valve

Answer 15

external

Question 16

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

Answer 16

higher

Question 17

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

Answer 17

brake valve

Question 18

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

Answer 18

internal

Question 19

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

Answer 19

external

Question 20

flow path on DCV are called

Answer 20

ways

Question 21

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

Answer 21

3 way, 2 position

Question 22

DCV used to operate flows above 20-25 GPM

Answer 22

pilot operated DCV, or piggy back DCV

Question 23

pilot operated valve direct fluid to main valve at this PSI

Answer 23

75-100

Question 24

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

Answer 24

tandem center

Question 25

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

Answer 25

float center or motor center

Question 26

check valve poppet used to handle higher flows

Answer 26

poppet style

Question 27

check valve poppet used to handler smaller flows

Answer 27

ball style

Question 28

check valve able to handle 3 times the flow

Answer 28

right angle check valve

Question 29

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

Answer 29

pilot to close

Question 30

3 flow control methods

Answer 30

meter in meter out bleed off

Question 31

metering method best used to push a load

Answer 31

meter in

Question 32

metering method best used to provide positive control for runnaway loads

Answer 32

meter out

Question 33

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

Answer 33

bleed off

Question 34

pressure compensators are also called

Answer 34

hydrostat

Question 35

2 types of pressure compensator

Answer 35

bypass | restrictor

Question 36

pressure compensator used in meter in only | can replace main relief valve

Answer 36

bypass compensator

Question 37

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

Answer 37

restrictor pressure