ME 4232_Lab_5

ME 4232_Lab_5 - Make sure to adjust the valves so that they...

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Revised 01/05/12 1 ME 4232: Fluid Power Control Lab University of Minnesota Prof. Perry Y. Li Lab 5: Relief valves Objective Relief valves are the most common pressure control valves. They are used to maintain or limit the pressure at the inlet port to be at or below a pre-set level. You will study the characteristics of two types of relief valves: Direct acting and Pilot operated relief valves. Pre-lab – Due as a hardcopy at the beginning of lab Read about the operation of direct acting and pilots operated relief valves from your textbook draw the expected pressure vs. flow relationship for the direct and pilot operated relief valve on the same plot. Describe, in a paragraph, how you can improve the performance of each type of valve. Procedure Similar to the previous lab, use the hydraulic circuit shown above to obtain the pressure-flow relationship of the valves in location A (direct/pilot operated relief valves) by adjusting the needle valve B.
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Unformatted text preview: Make sure to adjust the valves so that they have the same cracking pressures (e.g. 150, 200, 250, 300 and 350 psi). Be sure to understand the difference between cracking pressure and full flow pressure. The latter is easier to set, so you may have to iterate a few times. Choose the settings of the valves so that you get data points where they are must useful. Report Your report should include the following Detailed explanation of the working principle for the two types of pressure relief valves Brief description of the experiment Plot showing the data that you have collected Is your data consistent with the expected flow-pressure relationship for the two relief valves PCFC that you predicted in the pre-lab exercise? Comment on the relative advantages and disadvantages of the two valves...
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