A ) The figure shows a simple pump cylinder circuit. the cylinder must push a constant load of 170,000 N. The pump provides a real volume flow Qp = 140 l/min. Loss in the directional valve is calculated at 2 bar when the pump and cylinder are connected via this. The safety valve is set at 200 bar. the plant is filled with oil with specific gravity equal to 0.85. effective cylinder area is 100cm2 After the plant was put into operation. It was found that the speed of the cylinder was too great. It was desired that the specified load should be pushed by 0.2 m / s. It was decided that one should weld into the pipe before the cylinder, a fixed, sharp-edged throat piece (as indicated in the figure) in parallel with a non-return valve. 1) Calculate the diameter d of the opening in the larynx so that the load, when pushed, travels at the desired speed. Assume flow coefficient u M = 0.6 2) How much power in kW is lost in total between the points x and y in this circuit (see figure) when the load is pushed out at a constant speed and the choke is in place. B) How much power is lost in a pipeline with an inner diameter equal to 30 mm and a length of 100 m when the oil flow being transported is 0.24 m3 / min. The oil has a kinematic viscosity 1 = 20cSt and a density 3 p= 840kg/m == m ANSWERS: I have the answers to this question. but I just do not know how to solve them. here are the answers: A) 1) 7.23 mm 2) 12.6 kW B) 5.98 kW
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