Description

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.

Features

  • HUSH® trim provides a cost effective option for severe duty applications where stacked disc trim is not required.
  • Resolves existing problems for both compressible and noncompressible fluid flow applications.
  • Pressure breakdown occurs in stages within the cage away from the plug surface, extending seat and trim life.
  • Generally limits noise to 85dBa or less
  • Multiple pressure drops prevent sonic velocity from occurring within valve
  • Prevents aerated liquids from eroding trim and valve parts

Applications

• Boiler feed pump Recirc.

• Boiler feedwater Startup

• Turbine bypass to atm. or condenser

• Aerated liquid applications

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