EU and EW Series Valves
Instruction Manual
August 2010
4
W6825-1/IL
Figure 2. Cutaway Detail of Fisher WhisperFlo Trim, Valve Body Typical
Fisher WhisperFlo trim represents state of the art
solutions for applications that demand ultimate
aerodynamic noise attenuation.
Control valves with WhisperFlo cages (figure 2)
provide additional aerodynamic noise attenuation in
very demanding vapor or gas applications with
high-pressure drops. A WhisperFlo cage with an
appropriately sized valve body is designed to reduce
the noise level up to 40 dBA. For special
applications, 50 dBA attenuation can be achieved.
Specifications
Typical specifications for these valves are shown in
tables 1 and 2. Some of the specifications for a
given valve assembly as it comes from the factory
appear on the actuator nameplate if the valve is part
of a complete control valve assembly.
Installation
WARNING
To avoid personal injury or property
damage resulting from the sudden
release of pressure, do not install the
valve assembly where service
conditions could exceed the limits
given in this manual or on the
appropriate nameplates. Use
pressure-relieving devices as required
by government or accepted industry
codes and good engineering practices.
Always wear protective gloves,
clothing, and eyewear when
performing any installation operations
to avoid personal injury.
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
If installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section in this instruction manual.
CAUTION
The valve configuration and
construction materials were selected
to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions. Because
some valve body/trim material
