[Q&A Question 154] 2018.06.03
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【Q&A Question 154】June 3, 2018: Briefly explain why a gas-actuated valve is used in thermal low-pressure liquid control valves The control valve for the hot low-pressure fraction level uses a air-actuated valve; it opens when an instrument signal is present and closes when there is no such signal. In this way, when the air supply is interrupted, the control valve can automatically shut off the flow between the hot low-pressure fraction and the cold low-pressure fraction, preventing accidents involving high pressure leaking into the low-pressure system. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below. The APP short-video skills competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
From a safety perspective, prevent pressure surging in the event of an accident.
The control valve for the hot low-pressure fraction level uses a air-actuated valve: it opens when there is an instrument signal and closes when there is no such signal. In this way, when the air supply is stopped, the control valve can automatically cut off the flow between the hot low-pressure fraction and the cold low-pressure fraction, thereby preventing accidents involving high pressure entering the low-pressure system
Prevent accidents caused by liquid level overpressure during gas outages
Answer: The control valve for the hot low-pressure fraction level uses a air-actuated valve; it opens when there is an instrument signal and closes when there is no such signal. In this way, when the air supply is stopped, the control valve can automatically cut off the flow between the hot low-pressure fraction and the cold low-pressure fraction, preventing accidents involving high pressure entering the low-pressure system.
When the air supply is cut off, the valve closes completely to prevent high pressure from leaking into low pressure in case of an accident
The control valve for the hot low-pressure fraction level uses a air-actuated valve: it opens when there is an instrument signal and closes when there is no such signal. In this way, when the air supply is stopped, the control valve can automatically cut off the flow between the hot low-pressure fraction and the cold low-pressure fraction, preventing accidents involving high pressure leaking into the low-pressure system.
Prevent accidents caused by liquid level overpressure during gas outages
The control valve for the hot low-pressure fraction level uses a air-actuated valve; it opens when an instrument signal is present and closes when there is no such signal. In this way, when the air supply is interrupted, the control valve can automatically shut off the flow between the hot low-pressure fraction and the cold low-pressure fraction, preventing accidents involving high pressure leaking into the low-pressure system.