True/False
Indicate whether the
statement is true or false.
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1.
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Flow control valves control the flow rate of fluid in a ciruit.
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2.
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Closing the orifice of a flow control valve increases flow rate, while opening
the orifice reduces the flow rate.
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3.
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A resistive load are loads that act in the direction of motion, while tractive
loads are loads that oppose the direction of motion.
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4.
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Excess flow that does not pass through the partially closed flow control valve
in a system with a pump that is not pressure compensated will crack the pressure relief valve, thus
flowing through the PRV to the tank.
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Matching
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a. | temperature-compensated | e. | pressure-compensated | b. | bleed off | f. | variable displacement pump | c. | check
valve | g. | flow
divider | d. | pressure intensification | h. | Cv (flow coefficient) |
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5.
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________ is another way to control the speed of an actuator.
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6.
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The __________ allows for unrestricted flow in one direction and restricts flow
in the opposite direction.
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7.
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A _____________ flow control valve automatically adjust the size of the orifice
in order to respond to system pressure changes.
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8.
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A __________________ flow control valve contain a temperature sensitive element
that causes the orifice size to decrease proportionately to a temperature increase.
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9.
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The _________________ describes the relationship between pressure drop and flow
rate for a given valve mathematically.
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10.
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____________ flow control is done via an additional line that runs through the
flow control valve; slows down the actuator.
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11.
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___________ occurs in a cylinder when the flow control valve in a meter-out
circuit is completely closed.
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12.
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The flow of the pump is split into two or more streams of equal flow rates by
the ____________.
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13.
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Hydraulic cylinder with meter-in flow control, both strokes
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14.
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Hydraulic cylinder with meter-in flow control, extend stroke
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15.
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Hydraulic cylinder with meter-out flow control, extend stroke
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16.
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Hydraulic cylinder with meter-out flow control, both strokes
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a. | cushioned cylinder | d. | meter-in | b. | proportional flow divider | e. | meter-out | c. | priority flow
divider |
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17.
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When a circuit controls the flow rate going into the cylinder.
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18.
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Contains in built in control that can slow down the extension just before the
end of a stroke.
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19.
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Divides the pump flow into two fixed proportions, often 50/50.
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20.
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When a circuit controls the flow rate going out of the cylinder.
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21.
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Divides the pump flow based on a fixed setting to a priority outlet and
secondary outlet.
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The units have been removed from the answer choices to keep you from being
lame and guessing based on units.
a. | 35.16 | d. | 2 | b. | 2.27 | e. | 360 | c. | 51.85 | f. | 18.63 |
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22.
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A valve with a Cv of  has a pressure drop of 50
psi. What is the flow rate through the valve? The system uses standard hydraulic oil (Sg =
0.9).
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23.
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A valve with a Cv of  has a pressure drop of 320
kPa. What is the flow rate through the valve? The system uses standard hydraulic oil (Sg =
0.9).
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24.
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A valve with a Cv of  is being considered for use
in a system that has a flow rate of 10 gpm. What will the pressure drop be across the valve? The
system uses standard hydraulic oil (Sg = 0.9).
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25.
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A valve with a Cv of  is being considered for a
use in a ssytem that has a flow rate of 35 lpm. What will the pressure drop be across the valve. The
system uses standard hydraulic oil (Sg = 0.9).
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26.
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A valve being tested in the lab was found to have a pressure drop of 25 psi at
a flow rate of 10 gpm. The valve was tested using water. What is the Cv value for this
valve?
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27.
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A valve being tested in the lab was found to have a pressure drop of 175 kPa at
a flow rate of 30 lpm. The valve was tested using water. What is the Cv value for this
valve?
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