RIch, The incoming pressure is within specifications. When we see noise and vibration, it usually does not relate to incoming pressure or pressure reduction. It has to do with flow rate through the valve. We recommend selecting the valve size by calculating design flow rate and referring to the flow characteristic chart in the technical brochure. Then selecting the model that will provide that flow rate at a 3-6 f/s velocity. Then referring to the minimum flow rate that valve can work at a 1 f/s velocity. It is not uncommon to see the valves sized on pipe size and the flow rate of that pipe size connection is oversized for the actual building requirement. You could see a PRV that is one or two pipe sizes then the connecting piping because of flow requirements. An over sized PRV will cause vibration and noise.
RIch, The incoming pressure is within specifications. When we see noise and vibration, it usually does not relate to incoming pressure or pressure reduction. It has to do with flow rate through the valve. We recommend selecting the valve size by calculating design flow rate and referring to the flow characteristic chart in the technical brochure. Then selecting the model that will provide that flow rate at a 3-6 f/s velocity. Then referring to the minimum flow rate that valve can work at a 1 f/s velocity. It is not uncommon to see the valves sized on pipe size and the flow rate of that pipe size connection is oversized for the actual building requirement. You could see a PRV that is one or two pipe sizes then the connecting piping because of flow requirements. An over sized PRV will cause vibration and noise.