Gas Manifolds without Valves

Try parker search

You might also try searching "hydraulic manifolds". The size and pressure range you mention are common in hydraulics.

Here's an idea, if your capable of designing and building NG compressors, why not design and build your own HP manifolds? That way you can build them with or without valves and what ever thread size you desire or require?

http://www.daman.com/catalog/pdf/headersandjunctions/Header%20Manifolds%20-%200%20Degree%20Design.pdf

Steel versions rated at 5k PSI.

Oh, and as others have mentioned, a manifold is just a chunk of machined material. Draw your own that fits your new design and, if you don't have machining capabilities in-house, shop it out.

Do you have an experienced designer working with you?

Isn't a manifold without any valves on it basically just a pipe with fittings/ports welded to it?

Any high pressure manifold that has porting for valves can do. Just plate over the ports for the valve. You can find the plate from the manifold manufacture. They may have a ported plate that will feed thru to the A and B outputs. I have only seen blank plates that block off all the ports. If not have one made.

If you are not interested in doing it yourself, as some have suggested, look in the Columbus yellow pages, business directory and a Google search. There are numerous shops in the Columbus, Dayton, Cincinnati, Akron, Canton, Cleveland (basically I-71 corridor) that would want to take on designing and manufacturing what you want. There is a lot of high tech and rust belt industries there, take advantage of it.

Good Luck, Old Salt