【Q&A Question 153】2017.06.02
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This post was last edited by 955559 on 2017-7-21 23:16. [Q&A Question 153] June 2, 2017: What is the leakage rate of a control valve? The reference answer can be seen after replying; points will be awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The leakage rate of a control valve refers to the flow rate of the test fluid through a control valve that is in a closed state, under specified temperature and pressure conditions. Scoring criteria: 2 points for incorrect answers; 3–8 points for *incomplete* answers; 10 points for correct answers accompanied by a detailed explanation; 15–20 points for correct answers with additional *supplementary* information. Please score according to these criteria. Note: If there are editing records after answering, only those who participated will be given points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters unrelated to the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have started) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have started) 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
If a valve is not fully sealed, there will be a certain amount of leakage, which is usually expressed as a percentage
Parameter allowing leakage amount of the control valve when in fully closed position
The leakage rate refers to the flow rate of fluid passing through the valve under specified test conditions with the valve closed. The test conditions referred to here include sufficient thrust on the actuator, the ability of the valve seat and valve core to be pressed together, a certain pressure difference before and after the valve, and testing at room temperature. The allowable leakage volume, as the name implies, refers to the flow rate of fluid that is permitted to pass through the valve under test conditions.
The leakage rate refers to the flow rate of fluid passing through the valve under specified test conditions with the valve closed. The test conditions referred to here include sufficient thrust on the actuator, the ability of the valve seat and valve core to be pressed together, a certain pressure difference before and after the valve, and testing at room temperature. The allowable leakage volume, as the name implies, refers to the flow rate of fluid that is permitted to pass through the valve under test conditions.
When selecting, manufacturing, and testing control valves, the parameter of leakage rate is often used; it is a crucial factor in assessing the performance of these valves. This is especially true in applications where strict sealing of the medium is required. If the leakage rate does not meet the specified standards, it can lead to reduced product quality at the least, or even cause production accidents in severe cases.
The flow rate of fluid through the valve under specified test conditions with the valve closed.
If a valve is not completely sealed, it has a leakage rate (i.e., a CV value or CV rating). There are various levels of leakage rates, and each level comes with a leakage limit specified as a percentage range
When the control valve is in normal operation. When the control valve position is at zero! The amount passed!