The HUSH® trim is an innovative concept in control valve trim designed by Copes-Vulcan for high pressure drop liquid, gas, and steam applications.
This unique trim eliminates cavitation in liquid flow and provides multiple pressure breakdown for noise attenuation in critical pressure drop compressible fluid applications. The trim assembly consists of a number of nested concentric cylinders, each having a series of radially drilled holes. The orifice areas are developed by arranging the cylinders, one within the other, in an offset manner that a series of restriction (pinch areas) and expansion areas occur in series. The total pressure is thus reduced in stages.
• Boiler feed pump Recirc.
• Boiler feedwater Startup
• Turbine bypass to atm. or condenser
• Aerated liquid applications