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  1. Dutch7

    Cv rating question

    Hello all, Simply a follow up message as I promised. It took a few weeks however the replacement valve (2.0 Cv) was installed yesterday and we are now able to regulate below 200 psi, we have met our goal and actually exceeded it. Thank you all for your help/direction and comments. warm...
  2. Dutch7

    Cv rating question

    TD2K - I agree with your view(s), we might be a bit oversized on the pump - we will install a 2.0 Cv valve and report back in a few weeks.
  3. Dutch7

    Cv rating question

    Thank you for the confirmation, the next largest valve has a Cv of 2.0 which will allow even more flow through = more adjustment. Ps - I have always said the glass is twice as big as required... Thanks again to all who participated in this response. Dutch
  4. Dutch7

    Cv rating question

    Gentlemen - Thank you all for your responses and comments, I am grateful to receive so many. Hopefully I can fill in some of the gaps for you with this explanation. From above: Pump flow rate = 15.8 gpm Desired system pressure = 150 psi Tubing size = 3/4" BP valve size = 1/2" npt BP Cv...
  5. Dutch7

    Cv rating question

    The fluid is not water, SG = 1.25 It is important to understand we are not trying to push 15.8 gpm through the valve, this is really a relief valve so if we were allowing 5 gpm through the valve in your formula the dp would be equal to 17.36 psi but it is not, am I missing something obvious...
  6. Dutch7

    Cv rating question

    Good day, I have a small pressure manifold outfitted with a back pressure regulator to control downstream system pressure and relieve excess pump generated flow and pressure back to tank. Pump flow rate = 15.8 gpm Desired system pressure = 150 psi Tubing size = 3/4" BP valve size = 1/2" npt BP...

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