i am looking for a valve which can be adjusted to a desired output of between 1 and 20 gallons per minute, regardless of the pressure to the valve. this valve would be placed on a 2 inch pvc line carrying raw water pumped from a surface tank to
Have you looked into the water faucets that control flow to maintain a constant temperature as pressure changes. In hydraulics we call it a Pressure Compensated Flow Control but they usually only operate in the compensating mode above 100-125 PSI
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