Every restriction orifice plate does one job: dissipate energy. Fluid enters the bore, accelerates to a high-velocity jet, and drops to its lowest pressure at the vena contracta a short distance downstream — then recovers only part of that pressure as the jet expands back to the full pipe. The difference between upstream and recovered downstream pressure is the permanent loss the plate was sized to create, and where that loss is taken is what separates a plate that runs quietly for decades from one that cavitates, erodes, and takes the downstream pipe with it. The articles here work through how pressure actually behaves across an orifice in real piping systems: sizing for a target pressure drop, predicting cavitation and flashing from the vena contracta pressure and fluid vapor pressure, boiler blowdown and pump minimum-flow service, and why the traditional multi-stage orifice approach has limits that engineers should understand before specifying one. They're written by the engineers who size and manufacture our plates, for the engineers who have to live with the result.
