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With an Rv regulator you have a spring and a diaphragm which control the pressure and to a certain extent reduce flow. You get what you pay for, more expensive regulators reduce flow less due to better internal designs. The outlet psi is determined by the internal spring.
Sforal, a better analogy for what you are saying is a sieve, the more holes the better the flow. For backpacking the filter is necessarily small which means fewer holes. A large house filter can be 5 microns but due to the size there are more holes and less restrictions on flow. The whole house 5 micron filter on our coach doesn't restrict flow at all, what little restriction we have is all from the regulator.
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