ROBO_226_Lab_3 (1)
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Automation & Robotics
ROBO-226 Fluid Power
Lab 3: Flow and Pressure
Objective:
To explore the characteristic of flow and
pressure in the hydraulic circuit.
Upon successful completion of this lab, the learner will be able
to:
▪
Explain how fluid pressure is created in hydraulic systems.
▪
Explain how flow is created in hydraulic systems.
Procedure:
A.
Deadhead the system and set system pressure to 1000 psi.
B.
Turn off the system
C.
Connect a hose from one of the pressure ports on the connection header to the inlet
of the flow meter.
D.
Connect hose from the flow meter outlet to one of the return ports on the connection
header.
E.
Once the circuit is checked by the instructor turn on the system and measure the
system flow.
F.
Flow meter should show 4 GPM flow rate which delivered by the pump under no
load condition.
G.
Call the instructor if the flow meter is not showing 4 GPM.
H.
Now find the flow control valve on the panel and connect
“Tee”
to both end of the
flow control valve.
I.
Install pressure gauge on one end of the
both “tee”.
Now referee them with PG1 and
PG2.
J.
Now disconnect the flow meter (FM1) outlet hose from the return line and connect it
to at flow control valve where pressure gage (PG1) is installed.
K.
Find the second flow meter (FM2) and connect inlet of the second flow meter at the
flow control valve where PG2 pressure gauge is connected.
L.
Connect outlet of the second flow meter (FM2) at the return line on the connection
header.
M.
Turn the adjusting knob on the flow control valve completely counter clockwise. (No
restriction)
N.
Call the instructor to inspect the circuit.
O.
Now turn on the system.
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ROBO226Fluid Power
Lab 3: Flow and Pressure
P.
Observe and record the initial readings on the flow meters and gauges into the table
when flow control valve is fully open. (PGM, PG1, PG2, FM1 and FM2.)
Q.
Turn the adjusting knob on flow control valve clockwise until the pressure reading on
PG1 is showing 300 psig.
R.
Observe and record the readings on all meters and gauges into the table.
S.
Continue to turn the adjusting knob on the flow control valve in 100 psig increments as
seen on PG1 while recording the reading on all flow meters and gauges into the table.
FM1
(gpm)
FM2
(gpm)
PGM
(psig)
PG1
(psig)
PG2
(psig)
T.
Draw graph for Q (FM1) Vs P (PGM) for the above table.
U.
Upon finish change your pump flow to 2 gpm and repeat procedures P to T.
V.
Turn off the system, remove the circuit and clean the work cell.
Lab Report Submission:
Due beginning of the next lab,
should include this cover sheet, the requested
information (
Items S and T
) of this cover sheet for both flow, circuit schematic and answer
the following questions.
One report per group is required.
1.
What does a flow meter measure?
2.
Is a relief valve considered to be a normally passing or normally non
–
passing
valve?
3.
State the function of a hydraulic pump.
4.
What determines pressure in a hydraulic circuit?
5.
What is occurring to the inside diameter of a Flow control valve (adjustable
orifice) when the adjusting knob is turn clockwise.
Lab report must follow following format.
1.
Title
2.
Objective
3.
Lab procedure (steps, important facts, some explanations)
4.
Equipment (list)
5.
Observations
6.
Circuit schematic (drawing using symbols)
7.
Conclusion
Instructors Signature:
(Lab report without Lab
Instructor’s
signature will not be accepted)
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OBSERVATIONS:
FLOW RATE
2 gpm
.
FM1
(gpm)
FM2
(gpm)
PGM
(psig)
PG1
(psig)
PG2
(psig)
2
2
100
200
0
2
2
250
300
0
2
2
350
400
0
2
2
450
500
0
2
2
550
600
0
2
2
650
700
0
2
2
750
800
0
2
2
850
900
0
1.9
1.9
950
1000
0
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OBSERVATIONS:
FLOW RATE
4 gpm
.
FM1
(gpm)
FM2
(gpm)
PGM
(psig)
PG1
(psig)
PG2
(psig)
4
4
300
300
80
4
4
350
350
80
4
4
400
400
80
4
4
500
500
80
3.9
3.9
600
600
80
3.9
3.9
700
700
60
3.9
3.9
800
800
60
3.9
3.9
900
900
60
3.9
3.9
1000
1000
50
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Conclusion
:
To conclude, by performing this practical the students understood the relationship
between pressure and flow rate in the hydraulic system.
1.
What does a flow meter measure?
-
The Flow meter in a circuit is used to measure the flow rate of the fluid
passing through the circuit.
2.
Is a relief valve considered to be a normally passing or normally
non
–
passing valve?
-
A relief valve is considered to be a normally non-passing valve.
3.
State the function of a hydraulic pump.
-
A hydraulic pump is a mechanical device that transforms mechanical
energy into hydraulic energy. It generates flow with sufficient power to
overcome the pressure caused by the load.
4.
What determines pressure in a hydraulic circuit?
-
Pressure is created when there is a resistance in fluid flow.
5.
What is occurring to the inside diameter of a Flow control
valve (adjustable orifice) when the adjusting knob is turn
clockwise.
-
When the adjusting knob is turned clockwise, the inside diameter gets
smaller and smaller, restricting the fluid flow causing rise in pressure.
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