avro wrote: I'm not familiar enough with PSI numbers but I assume it's equivalent to 21MPa ?
Anyway, Since I know now that they work on hydraulics.
Can someone give me the pressure in a pneumatically operated reverse ?
Thanks again icon_smile.gif
Chris
21MPa is the same as 210 bar or 2000 PSI
You need to know a couple of basic rules that are use in the hydraulic servo technic. The normal pump pressure in aircaft hydraulic systems is 3000 PSI (210 bar). But wen you are working with servo valves you need a certain pressure difference between the pumpside of the valve and the actuator side of the valve. In the 1950 when hydraulic servo technics were used in the USA in aviation they made a rule: the pump pressure is 3000 PSI (210 bar) they made a rule that the valve pressure needed to be 1/3 of the pump pressure, so 1000 PSI or 70 bar. When you have a high valve pressure you have a good positioning tolerance vs weight. In the past decades the 210 bar has been rased to 350 bar.
Greetz,
Dave