Data Sheet

Vee-Ball Attenuator
D101843X012
Product Bulletin
51.3:Vee-Ball(S2)
January 2013
4
Other Considerations
When a rotary noise attenuator is installed in a Vee-Ball
valve, the V-notch is no longer a point of high-velocity
erosion. As a result, the CoCr-AV-notch option is not
required when a rotary noise attenuator is used. The
rotary attenuator and CoCr-AV-notch options are not
available together.
Table 1. Segmented Ball Benefits Analysis Comparison
Benefits
Typical Competitive
Device
Fisher Vee-Ball
Attenuator
(1)
Predictable Performance No Yes
-10 dBA Aerodynamic Noise Attenuation No Yes
Superior Attenuation Effect at Critical Opening Position No Yes
Maximum Pressure Drop Capability No Yes
Heavy Duty, Integrally Welded Attenuator/Ball Assembly No Yes
Valve Splined Shaft Connects to Clamped Actuator Lever to Minimize Lost Motion No Yes
Superior Soft Seats for Tight Shutoff No Yes
Moderate Kc Improvement vs Unattenuated Device Yes Yes
Trunnion Mounted Ball for Superior Wear Resistance Yes Yes
Heavy Duty Metal Seats for Demanding Applications Yes Yes
1.Seefigure3forvalvecharacteristics.
Figure 2. Typical Fisher ENVIRO-SEAL PTFE and
Graphite Packing Arrangements
PACKING
BOX STUD
ACTUATOR
MOUNTING
YOKE
VALVE
SHAFT
YOKE
BEARING
PACKING
FLANGE
PACKING
FOLLOWER
SPRINGS
VALVE
BODY
ANTI-
EXTRUSION
RINGS
PACKING
BOX RING
PTFE
PACKING
V-RINGS
SHOWN
W5806-1
Figure 3. Valve Characteristics
B2365-1
VALVE OPENING--DEGREES
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they arenot
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
E 1991, 2013 Fisher Controls International LLC. All rights reserved.
Fisher, Vee-Ball, and ENVIRO-SEAL are marks owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co.
Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property
of their respective owners.
Neither Emerson, Emerson Process M anagement, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.