【Q&A Question 154】2017.06.03
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This post was last edited by 955559 on 2017-7-21 at 23:15. [Q&A Question 154] 2017.06.03: Is the minimum flow rate that can be controlled by a control valve the same as the leakage rate? Please give a brief explanation. The reference answer will be visible after replying; scoring is based on identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) No, the minimum controllable flow rate is the lower limit of the adjustable flow rate; it is generally 2.4% of the maximum flow rate. The leakage amount, on the other hand, is the amount that leaks when the valve is completely closed, and this leakage amount is only 0.5–0.001% of the maximum flow rate. Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses that are correct but lack sufficient details earn 15–20 Wealth points. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html
The minimum flow rate is the lowest flow rate that can be adjusted by the control valve; too low a flow rate can damage the seal of the control valve. The leakage amount refers to the leakage that occurs when the control valve is closed, due to issues with the seal
When the amount of leakage from a control valve has a significant impact on the process, it is necessary to strictly control it by selecting valves with low leakage rates. The minimum flow rate that can be controlled by a control valve is different from the leakage rate; the minimum controllable flow rate is generally 2.4% of the maximum flow rate.
That’s incorrect. The controllable flow rate (Qmin) is the lower limit of the adjustable flow rate; it is generally 2–4% of the maximum flow rate (Qmax). The leakage rate, on the other hand, refers to the amount of fluid that leaks when the valve is completely closed, and it is only 0.5%–0.001% of the maximum flow rate.
No. The controllable flow rate is the lower limit of the adjustable flow rate; it is generally 2% to 4% of the maximum flow rate (Qmax). The leakage rate, on the other hand, is the amount that leaks when the valve is fully closed, and it amounts to only 0.5% to 0.001% of the maximum flow rate.
Answer: No. The controllable minimum flow rate (Qmin) is the lower limit of the adjustable flow rate; it is generally 2–4% of the maximum flow rate (Qmax). The leakage rate, on the other hand, is the amount of fluid that leaks when the valve is fully closed, and it is only 0.5%–0.001% of the maximum flow rate
They are not the same thing: the controllable flow rate is the lower limit of the adjustable flow rate, and it is generally 2–4% of the maximum flow rate, while the leakage rate is the amount that leaks when the valve is fully closed; this leakage rate is only 0.5%–0.001% of the maximum flow rate.
Utilize the movement of the valve stem to regulate flow rate
They are not the same thing; the minimum flow rate occurs when the valve is slightly open, just enough to cause a slight excess, while the leakage amount refers to the internal leakage within the valve
It’s not the same thing. The minimum flow rate that can be controlled by a control valve is the lower limit of its adjustable flow range; it is generally 2% to 4% of the maximum flow rate. The leakage rate, on the other hand, refers to the amount of fluid that leaks when the valve is fully closed, and it is only 0.001% to 0.5% of the maximum flow rate.
No. The controllable flow rate (Qmin) is the lower limit of the adjustable flow rate; it is generally 2–4% of the maximum flow rate (Qmax). The leakage amount, on the other hand, is the volume that leaks when the valve is completely closed, and it amounts to only 0.5%–0.001% of the maximum flow rate.