Brochure

This valve plug has sustained extensive
cavitation damage. It shows a complete loss
of seating surfaces.
View an animation video on cavitation at www.FisherSevereService.com
Fisher
®
Pulp and Paper Solutions | 5
Click on the QR code to view the Fisher
Cavitation-Control Technologies brochure.
Flashing
Although similar to cavitation, flashing creates a liquid-vapor
mixture where the proportion of gas and liquid phase changes as
pressure or temperature change. Whereas cavitation creates an
irregular, pitted surface on components, flashing creates a shiny
and smooth appearance.
However, flashing is of concern because of its ability to limit
flow through the control valve and its highly erosive nature. This
can cause operational problems, increased maintenance, and
unexpected downtime.
Cavitation
Simply stated, cavitation is the formation and collapse of
cavities in a flowing liquid. It becomes critically important for
appropriate valve sizing, selection of products and materials,
and cavitation mitigation technologies to ensure problems do
not arise. Emerson provides a wide range of cavitation control
technologies for clean or dirty service. Utilizing Fisher application
engineers and experienced design engineers will ensure you
receive a custom solution for your application.
Cavitation is a concern for plant operators and maintenance
personnel because it can reduce plant operations and
profitability. Cavitation not only decreases flow capability
through control valves, but it may also cause material damage,
excessive noise, and high vibration. This material damage can
severely affect the control valve’s operability and overall control
loop performance.