Best Way to Control Vacuum Level in a series of Tanks

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.
 

Bystander

Science Advisor
Homework Helper
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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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