Gary R
10-02-2008, 11:11 AM
Has anyone ever tried a water ejector for vacuum? Some of the machine I work on use these to pull vacuum on chambers. They use the venturi principle. They are about a 6" long plumbing fitting that you pass water through and get a vacuum from a port on the side.
The ones we use are 3/4" NPT. If you apply 60psi of water to it you will get about 2cfm at atmospheric. The rate of evacuation (cfm) loss is pretty linear all they way down to absolute vacuum. These will pull very deep and other sizes are available. To run this you would need a water pump and resivior to recirculate the water. I have the manufactures technical info on PDF. If anyone would like it and one of these ejectors I can send it. I have one in my scrap pile and will be getting another from a machine I will take out of service soon.
These should work for a few hundred taps?
The ones we use are 3/4" NPT. If you apply 60psi of water to it you will get about 2cfm at atmospheric. The rate of evacuation (cfm) loss is pretty linear all they way down to absolute vacuum. These will pull very deep and other sizes are available. To run this you would need a water pump and resivior to recirculate the water. I have the manufactures technical info on PDF. If anyone would like it and one of these ejectors I can send it. I have one in my scrap pile and will be getting another from a machine I will take out of service soon.
These should work for a few hundred taps?