Best Way to Control Vacuum Level in a series of Tanks

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SUMMARY

The optimal method to control vacuum levels in two tanks, one requiring 200 mmHg and the other 500 mmHg, involves using a combination of globe valves and a needle valve. The system utilizes a water jet ejector capable of achieving 600 mmHg vacuum, which effectively maintains 550 mmHg in both tanks without additional valves. For manual adjustments, operators should consider the bleed rate through the chosen valves to minimize maintenance frequency and ensure consistent performance.

PREREQUISITES
  • Understanding of vacuum systems and their components
  • Familiarity with globe valves and needle valves
  • Knowledge of water jet ejectors and their vacuum capabilities
  • Basic principles of pressure regulation and manual control systems
NEXT STEPS
  • Research the specifications and installation of globe valves for vacuum applications
  • Learn about the operation and maintenance of needle valves in vacuum systems
  • Investigate the performance characteristics of water jet ejectors
  • Explore manual control techniques for maintaining vacuum levels in industrial settings
USEFUL FOR

Engineers, process operators, and technicians involved in vacuum system design and maintenance, particularly those seeking manual control solutions for static processes.

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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