Hi all,
I have a query about an issue we have with a pressure regulator valve and possible solutions.
Process conditions
Process media: nitrogen gas
Process temperature: ambient
Upstream pressure: 7.5barg
Desired downstream pressure: 2.7barg
Desired flow-rate range: 80Nm3/h to 1000Nm3/h
We currently have a pilot operated Bailey Birkett G4 pressure regulator installed (a 2" valve with a 1 1/4" trim).
Problem:
When the downstream demand drops below 250Nm3/h the valve begins to oscillate and hunt which can lead to the downstream safety valve lifting.
My initial thoughts are that the valve is oversized and can't reliably control at this turndown ratio but I'm struggling to find anything on their turndown ratio in the literature and how you even contact the manufacturers 'birkett bailey'/ (pentair) / emerson.
Another suggestion is to install two PRVs in series.
Has anyone encountered this issue before and attained a successful outcome or can provide any guidance for the above?
Any assistance is much appreciated.