ROBO_226_Lab_3 (1)

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Centennial College *

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226

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Mechanical Engineering

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Jan 9, 2024

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Page 2 of 2 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.
Page 3 of 2 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)
Page 4 of 2 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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