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[QUOTE="terry hay, post: 689738, member: 48273"] I guess the easiest way to understand the "High Flow, Less Stress" concept is to revert back to the basics of hydraulics. Pressure over area equals force. If we look at the way a car jack works, we have a small piston which we apply pressure to via a lever. This piston displaces fluid which in turn acts upon another larger piston in the jack itself to create lift. The amount of lift that is created is proportionate to the surface area of the pistons. If the piston activated by the lever has a surface area one tenth that of the piston of the jack, then for every 10mm we move the lever operated piston we will get 1mm of lift at the jack. Also the velocity is reduced, slowing the acceleration of the jack piston to one tenth that of the plunger piston. If we were to reduce the size of the piston in the jack to one tenth the size of the plunger piston we would then see ten times the movement and ten times the velocity. Now think of the port area of the midvalve as the piston in the jack and the cross sectional area of the cartridge minus the area of the damper rod as the plunger piston. There are also some other factors at play within the cartridge but we are simplifying for the purpose of explaination. When it comes to the base valve, the same is true only this time the port area is only influenced by the cross sectional area of the damper rod itself. Once again simplified for explanation. So, high flow = low velocity, less deflection. Reduced flow = high velocity, more deflection. I guess I could have said it easier by using an example of a garden hose with no nozzle attached, flowing water. Now reduce the diameter by placing your thumb across most of the hole. Which one would bend a shim more? Regards Terry Hay [/QUOTE]
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