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rmw, thanks for the detailed response. In our case we have no condenser other than the motive liquid. So the eductor will need to keep pulling steam to maintain the vacuum. These eductors are billed as "heating eductors" and are designed to heat the motive stream with the steam being pulled in...

Remember, the fact that you are pulling water vapor is the KEY to the high level of vacuum. If the gas is condensible, you get much better performance. Temp of the motive fluid is 185 F. 40 psig upstream and 0 psig downstream. It's a 2.5" MLE from Jacoby Tarbox.

David, just to be clear the motive fluid is liquid water (or, more specifically, a stream that's mostly water) which is why I list the flow in gpm. I'm guessing if you have severe cavitation that you'll lose much of your vacuum.

In cooperation with an eductor vendor, I spec'ed an eductor for what is probably an unusual purpose. We have designed the eductor to pull vacuum on a falling film evaporator on one of our skids. The goal is to pull the maximum level of vacuum possible so we can operate our evaporator at low...

My experience is with 304 used as exhaust piping for diesel stationary diesel engines, so you can bet the temperature is well above 150 F. That is most likely the reason for the corrosion I saw. Thanks for the input!

I'm currently designing a skid that will be installed in a building isolated from precipitation and low temperature in the midwest. We are specifying 304 stainless for the piping - my experience with 304 is that is quickly rusts in an outdoor environment. Is 304 acceptable for piping indoors...

Wow, checked into the cost of that Norgren valve. $3800. I couldn't believe it.

Gerhard, Just to make sure I understand correctly, for the Norgren valve in option 1 . . . I could, for example, block off port 1 and connect ports 2 and 3 for normally closed operation. Can I then pressurize either port 2 and port 3 without leakage (say 100 psig on port 2 and 0 psig on port 3...

What is the footprint of these actuated ball valves? The only issue for me is that I will have a relatively high density of valves in one spot. Thanks for the tips. This is an avenue a colleague of mine also suggested I pursue.

Yep, I contacted those guys. Unfortunately, they don't have the size valve I need. I believe their largest Cv is much less than 1.

I've been doing web searches for quite some time trying to find a solenoid valve capable of sealing off liquid flow even if a large differential pressure exists between the outlet and the inlet or vice versa. In other words, the valve should remain tightly closed in both of the following...