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Minimum Flow

Please help me with this question.

How do I know the amount of minimum flow that a regulator can handle?

In some applications, sizing the regulator for minimum flow results in small CV,

comparing this calculated CV against the regulator total CV, results in percentages of 10% or less. Or with the tables of the selected regulator, comparing the minimum flow required against the total capacity of the regulator, results in a percentaje very low.

How do I know when my regulator can´t handle this minimum flow?

I´d like to know this for direct-operated and for pilot-operated regulators.

• turndown

Angel Perez

• 25 Nov 2015 4:32 PM
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1 Reply

• Jason Journey

  

  • 25 Nov 2015 7:47 PM

  Angel,
  
  Your question about minimum flow is always important when sizing an application that could have a wide span of flow requirements. While some regulators have seemingly infinite turndown capability, there are several factors that determine the available turndown for each installation. A few factors are the system pressure drop, piping size and length, rate of flowrate change, and which model regulator is selected. Our sales offices are highly trained to help you find the appropriate regulator for your installations. You can find your local sales office from here (www.regulators-emerson.com/salesofficelocator), or you can message me your contact info.
  
  As supplemental information, related content was previously discussed in this post:
  "A Solution for High Turndown Applications" www.emersonexchange365.com/.../5070
  
  Thanks,
  Jason

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