How to Create Pressure Differential?

How about: mount a 12 psi regulator in a sealed chamber, with air at pressure 'X' plumbed to the chamber. Connect high pressure air to the regulator input, via sealed
fitting through the chamber. Take output from regulator through another sealed fitting through the chamber. Output should be at pressure 'X'+12 psi. Don't really know if this will maintain dynamic level condition, as others have mentioned there are a lot of forces at work when not static.
bill m.
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Dear Bill Martin:

pressure 'X' plumbed

sealed fitting through

through the chamber.

maintain dynamic

work when not static.
Yes. This is pretty much what a remote pressure regulator (or remote pilot regulator) is.
David A. Smith
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Festo definetly have them: <http://catalog.festo.com/asp/frame_suche.asp?search=ps&L 1&search1=MPPES&FELD=TYP&suchart=normal>
They have thousands of devices for pneumatics designed to be integrated into automation. Their MPPES series of pressure regulator valves is probably what you want. They require a 0-10V or 4-20mA signal.
They also have proportional flow control valves more suited for position control such as their MPEY series.
<http://www.festo.com/INetDomino/coorp_sites/en/373ccfba15d9a839c1256d040050fdb1.htm
They can also supply pneumatic positioning processors to opperate the valves.
Pneumatic cycliners can now be positioned to within an amazing 0.02mm. These things are rock hard when you bash them even with a rubber mallet. They won't budge more than 0.02mm.
Festo also have

Use proportional 5/3 flow valves for position control. Tune your positioning to algorithm to provide you with the damping you need.
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I used an electronic regulator that was called Buzzmatics. Great product now sold under Marsh-Bellofram. They have dual loop controllers for leveling the vehicule using accelerometers.
Eric girard

side
that
difficulties
<http://catalog.festo.com/asp/frame_suche.asp?search=ps&L 1&search1=MPPES& FELD=TYP&suchart=normal>
<http://www.festo.com/INetDomino/coorp_sites/en/373ccfba15d9a839c1256d040050 fdb1.htm>
and
other
cylinder.
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