The Cla-Val Model 90-01KO Hytrol Pressure Reduce Valves with Anti-Cavitation Trim automatically reduces a higher inlet pressure to a steady lower downstream pressure, regardless of changing flow rate and/or varying inlet pressure. The valve is equipped with Anti-Cavitation Trim to provide for optimum downstream pressure control while reducing noise and eliminating damage associated with cavitation.Anti-Cavitation Pressure Reducing Valve

link:http://www.cla-val.com/documents/pdf/B-KO_Anti-Cavitation.pdf