Daily Question on Automation Theory Knowledge (7.22)

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Process and instrumentation are inseparable; to help everyone gain a better understanding of the basics of instrumentation, we have launched the \"One Question per Day\" series – just reply to get access to it. To encourage continued participation from everyone! You get 3 wealth rewards just for participating! I hope everyone will participate actively, learn together, and make progress together! ! ! Multiple-choice question: 8. The R value of the straight-through single-seat control valve produced in China is ( ). (R is the adjustable ratio of the control valve) A, 15 ； B, 30 ； C. 40 The answer to this question is: B. The adjustable ratio of a control valve is the ratio of the maximum flow rate that can be controlled by the valve to its minimum flow rate. The adjustable ratio, also known as the adjustable range, is denoted by R; thus, R = Qmax/Qmin. It should be noted that the minimum flow rate Qmin and the leakage amount have different meanings. The minimum flow rate refers to the lower limit of the adjustable flow rate; it is generally 2% to 4% of the maximum flow rate Qmax. The leakage volume, on the other hand, is the amount that leaks when the valve is fully closed, and it is only 0.1% to 0.01% of the maximum flow rate.