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How can one calculate the dimensions of valve shims in Gas pressure shock absorber?

Desription-

The valve shims are orifices to the fluid flow in the hydraulic damping system. The dimensions play a very vital role in the adjustment of compression and rebound of the damper.

I have been working on trial and error method, taking some reference dyno graphs, but can not manage to find a formula to calculate the exact dimensions of valve shims.

any help would be appreciated.

Thanks

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# Valve Shim calculation of a damper

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