pressure reduction without loss of flow

[clarkcourt]

we have a closed loop chilled water system that runs at a differential pressure of 30 psi. we are running one process off this system that requires us to drop the 30 psi to 15 psi while maintaing at least 1.5 gpm flow. any ideas

 

[Zoobie]

You will have to provide a lot more information if you want any useful help.

Is the 1.5 gpm the main loop flow or the side process? Regardless, need both flow rates.
Line sizes? System configuration?
What is circulating this water? Pump type?

 

[clarkcourt]

it's a side process that runs usually about 2 gpm

our system has 2 pumps a primary and secondary
it runs through a 1-1/2" main at about 65 GPM and breaks off into 36 1/2' feeds and returns each feed is about 2 gpm +- depending upon the process it is running

what we are looking for is a pressure reducer that will allow us to maintain full flow

 

[JimCasey]

I calculated that you need a Cv of only 0.37 to pass 2 gpm with a P1 of 30 psig and a P2 of 15 psig. Even hardware-store regulators such as the 1/2" Watts U5Z3 will handle this.