Where can I get a simple inline regulator?

The oxygen regulator in a gas welding set can easily handle 500 psi in, and they can generally be set anywhere up to 100 psi out. Not exactly in-line in the usual sense... but I suppose you could make it work. Other gases in HP tanks use similar regulators.

If your flow rate isn't too great you might try an oxy/acetelene(spelling) torch regulater. They will work from 4000 psi at the tank down to as low as you want to go. My oxygen regulater goes from 4000 on the tank side and up to 100 psi on the torch side. The gas reg only goes to 400 tank side to 30 on torch side. The cubic feet per minute might be another story,although there are considerably larger units than mine.

What are you regulating - liquid or gas - what volume?

I use two regulators in line - one to reduce the pressure to a intermediate pressure/volume and another to reduce it to the final pressure.
Each regulator to have a pressure gauge.

By using two regulators you have finer control than using two regulators - one for gross control and one for the final precise control needed for the outlet.

Need to know what you are dropping the pressure on. Nitrogen, plain compressed air, oxygen, etc. Many gases need special diaphrams to prevent reactions with the gas or leakage. (molicule size). Please provied more info and I will give you a listing of what we are using for the reduction of our line pressure.

Ric

Thanks for the all the respnses thus far - I'm happy to provide a little more info.

First and foremost, I'm dealing with compressed air.

Here's the planned layout right now: [Air Tank] - [Hose] - [Solenoid] - [Fitting] - [Venturi Vacuum Chamber http://www.vaccon.com/material.html]

The compressed air is fed into the side of the chamber where there might be a little compression ... but, other than that, the air is just going into the atmosphere. My exact vacuum chamber is the DF 10-6 ... I'm just concerned that 450 PSI might be too much pressure for the fitting (I couldn't really find a spec on their site ... will call today) -- I could be wrong, in which case I wouldn't even need a reg.

Thoughts? Thanks again, I really appreciate it.

(Above, where I say, "I'm just concerned that 450 PSI might be too much pressure for the fitting" - I was referencing the vacuum chamber, not the connector fitting between the solenoid and the chamber)

You may want to look at www.fisher.com . Thier catalog shows many different regulators with technical details. It shoudn't be difficult to fit one to your purpose.