【Weekly 3 Questions, Question 39】November 07, 2017

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This post was last edited by xh8618 on 2017-11-7 08:25. bg9.png The question for this issue is as follows: (Single-choice question) There is a control valve with a proportional flow characteristic, and its adjustable ratio is 32. If the maximum flow rate when the valve is fully open is 100 m3/h, then what is the flow rate when the valve is opened to 2/3 of its full position? A、67.7m3/h B、52.6m3/h C、40.6m3/h D、31.5m3/h The answer will be announced on November 9, 2017. Answer to the previous question: (Single-choice question) A control valve is connected in series in a piping system. Assuming the total pressure difference in the system remains constant, what is the pressure difference across this control valve when it is fully open? A. Maximum B. Minimum C. Equal to the total system pressure difference D. Approximately equal to the total system pressure difference. The answer is C; the error rate on this question is quite high, mainly because people fail to notice that they are connected in series within the pipes, and also because the total system pressure difference remains constant