Question

2. For the meter-in circuit shown below, the capacity coefficient of the flow control valve Cv 1.5 gpm/psi, cylinder piston diameter - 4 in, cylinder load 10,000 lbr, SG the pressure relief valve setting is 1000 psi (Hint: PRV setting pi). Determine the cylinder speed (in/s) when the valve is actuated and the cylinder is extending. (Assume ps-0) (6 pts) G of oil 0.9 and 01 P2 P3 r Foad OpRv PRV For the problem above, keeping everything the same, vary cylinder load from 500 lbrto 10,000 lbr, in steps of 500 lbr and calculate the speed of the cylinder for each load in excel sheet. Plot the cylinder speed (in/s) on Y-axis Vs. the cylinder load (Ibr) on X-axis. Submit your excel table and the plot with axes labeled. What is the trend of the speed of the cylinder with increasing load? What kind of valve do we need to keep the speed of the cylinder constant even when there is change in load? (3 pts) 3.

Answer 1

V SG S 1000-7577 Or 22.6 LPM 23 0S2 Calbulate the speed o the each land sta sti'1个oon Sooty to loooollf

linin Soo 39.710 | 1/9,975 | 3.176 1 000 79 580 427 3.912 259.tho 2 Soo 18.450 S.646 3-63 1 3600 23g,7391 44.498 3540 3So 29 S29 43.319 3.4146 0318 319 42.108 3.3s0 414.766 S 317.879 37.S74 148 6000 \ 11 77山79) 36.81c 12.933 7 334227 IS96-349 | 32.382-12.596 7500 000 63 637 30 7'3 2 4u So 676 428 27.011 2.308 4S00 7608 2S.192 2.ool 716 219 27.169 2.141 795.794| 23.046 ↑ 1.833 ot, oo

Trend of cylinder speed 4.500 4.000 3.500 E 3.000 2.500 2.000 1.500 1.000 0.500 0.000 2000 4000 6000 8000 10000 12000 Load (Ibf)