Best Way to Control Vacuum Level in a series of Tanks

AI Thread Summary
To maintain different vacuum levels in two adjacent tanks (200 mmHg and 500 mmHg) connected to a vacuum header capable of 600 mmHg, a manual solution is preferred. Globe valves, needle valves, or an air bleed may be effective for controlling vacuum levels, but the bleed rate will influence how often adjustments are needed. The current setup without valves achieves 550 mmHg in both tanks, indicating the system's efficiency. Regular maintenance, such as clearing orifices, is necessary to prevent blockages. A straightforward manual approach is suitable given the static nature of the process.
rollingstein
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I have two tanks next to each other, first needs to be kept at 200 mmHg vacuum & the second at 500 mmHg. Both are attached to a vacuum header which can achieve a 600 mmHg vacuum by means of a water jet ejector.

What is the best way to maintain the vacuum levels? Would a set of globe valves work? Or should I have an air bleed / leak? A needle valve?

If it matters, the piping is 1". So far without any valves the ejector has no trouble developing 550 mmHg in both tanks simultaneously.

The process is fairly static so I'm looking more for an old-school manual solution (that an operator adjusts, say, once every 20 minutes) rather than some fancy PID control loop.
 
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rollingstein said:
best way
How many "Best" ways were you seeking? Particularly, "Old school?" Bleed rate through whatever your choice of valve is going to determine frequency of adjustment, how often you'll have to switch wide-open to blow lint and other detritus from the orifice, and such forth, and so on.
 

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