When it comes to choosing a regulator for your application, you need information such as function, pressure, fluid, temperature, and flow. Since gases are compressible and liquids are not, there is quite a difference in sizing regulators for these two medias.
In this guide you get a breakdown of the valve sizing calculations for both liquids and gas. (Note: Valve sizing determines how much flow can pass through the pressure regulator, it does not refer to the size of the end connections.)
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