Rising rate regulator for Turbo engines

[Martin Easterbrook]

Anyone know a supplier of a good rising rate regulator?  My application 
needs a fuel pressure of 3barg up to about 10psi boost, then fuel pressure 
needs to ramp up to about 6.5barg at 19psi.  I've seen valves that are 
supposed to do this in books on turbocharging, but never seen one 
advertised for sale (in England).

Anyone have any good/bad experience of using them?
Martin

mailto:martin.easterbrook at virgin.net