Hey Guys! Does anyone know an equation to determine the spring rate for a regulator spring? It would be for an inline regulator along the lines of Ragnarok's design, pictured at end of post. From reading old posts on SpudFiles, I have a general idea of how to do it (I think).

Would the equation be something like this?:

Spring Rate = PSI output wanted * piston face area / compression distance

Compression Distance = spring free length - spring solid length

another way to do it?:

PSI Output = Spring Rate * Compression Distance / Piston Area

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Say you want a PSI output of 350 PSI and have a .5 inch piston.

Pi * r * r = Area

3.14159 * .25 * .25 = 0.196349375 in2 (piston face area)

350 PSI * 0.19635 in2 = 68.7225 PSI

68.7225 PSI / .09 in. (Compression Distance) = 763.5833 PSI Spring Rate

So you would need a spring with a spring rate of 764 PSI with a compression distance of .09 inches?

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