Ejector pulse in vacuum - confused about a Festo component... 2

[Alice24]

I'm going over some venturi vacuum generators, according to Festo, this vacuum generator has the feature of "ejector pulse valve" -- which is great, since it means I can release the vacuum. Thing is, I'm struggling to understand how could that feature be associated to a non-electronic part as you see in the link. Don't you need the venturi generator to be associated to a specialized valve for this feature to work? Perhaps that's what they mean, that you can "use a valve that has an ejector pulse" with that specific venturi generator

Would love some clarification from ye local know-it-alls )

 

[Jboggs]

Here's my best know-it-all advice after 40+ years of doing this stuff: Call Festo.

Component manufacturers usually have a department of "application engineers" whose only job is to help you successfully use their product. When I have a question like that I always get the best results by talking to a live person.

Here's another reason to go straight to the source: you are MUCH more likely to get the complete and accurate information from the manufacturer than from some engineering discussion forum.

Feel free to keep this advice for future use: Call them.

 

[Alice24]

True...will do

 

[handleman]

The diagram on the data sheet shows you how it's done, if you can read it. See attached pic...

During vacuum generation, high pressure air is supplied through port 1, and vacuum is generated at port 2. Additionally, a small internal reservoir fills with pressurized air. This air cannot reach port 2 due to the pilot operated check valve.

As soon as the air supply is removed, the pressurized air in the reservoir activates the check valve (see the dotted line in the diagram). The check valve activating means that this little pocket of air can't get out the way it came in (Port 1). It has to go out the other side, which happens to be connected to Port 2, creating your eject pulse.