Are there control valves for use in a vacuum environment?
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Hello, everyone in the instrumentation field. I’m from the process engineering department, and I would like to ask whether there are any instruments or valves available that can be used to further reduce pressure and control flow under vacuum conditions It was my first time encountering a vacuum system, so I wasn’t very clear about many things.
Please ask the experts for help, thank you
I have never seen such a manufacturing process. However, logically, there are a few points of doubt: 1. Material transfer cannot be achieved through pressure in a vacuum environment ； 2. Since it is a vacuum, further depressurization is not possible. Whether a quantitative delivery device should be used.
Ugh, upstairs, you should first understand that the transfer of materials relies not on pressure, but on pressure differences! !
I couldn’t understand what the original poster meant; vacuum systems are used in many areas of chemical production, so I didn’t grasp the meaning
This post was last edited and replied to by rongyang504 on 2011-8-22 at 11:51. Reply 5# sgq1313: Is there a vacuum control valve available with a pressure of -87 kPa gauge before the valve and -90 kPa gauge after the valve in a vacuum system? Under positive pressure, the pressure drop is generally above 30 kPa; I’m not sure whether 3 kPa is feasible under vacuum conditions Because if the pressure drop is too large, it means the vacuum level behind the valve is too high, which makes it difficult to operate the system
Yes, in a vacuum environment, special attention must be paid to preventing the vacuum from being broken, with particular emphasis on avoiding leaks from the valve. Generally, a bellows seal combined with a packing seal is used
Vacuum means negative pressure; there are specialized vacuum disc valves, and we have previously produced batches of electric vacuum disc valves.
So, are there any specific requirements regarding pressure drop when operating control valves under vacuum conditions versus under positive pressure?