Instruction Manual
D103195X012
Inline and Vent Diffusers
June 2017
Fisher™ 6010 -- 6015 and Whisper Disk Diffusers
Contents
Introduction 2.................................
Scope of Manual 2.............................
Description 2.................................
Principle of Operation 3.........................
Piping Considerations 3........................
Figure 1. Typical Fisher Inline and Vent Diffusers
Installation 3..................................
Maintenance 4.................................
Servicing 4...................................
Troubleshooting 4.............................
Parts Ordering 5................................
W1162-2
W1155-2
6010
W7353
W4888
6011
WHISPER DISK
X0002
6014 WhisperFlo™ VENT DIFFUSER
X0347
6012
www.Fisher.com
Inline and Vent Diffusers
June 2017
Table 1. Specifications (for Standard Designs)
Instruction Manual
D103195X012
Available Configurations
6010: Inline diffuser (with integral outlet head)
6011: Inline diffuser (pipe-style)
Whisper Disk: Inline diffuser (flat plate)
6012: Drilled‐hole Vent diffuser
6013: Drilled‐hole Vent diffuser (with outer shell)
6014: WhisperFlo disc style
6015: WhisperFlo disc style (with outer shell)
Sizes
6010: NPS 1 x 3 to NPS 26 x 48 (inlet x outlet)
6011: NPS 2 to NPS 30
Whisper Disk: NPS 2 to NPS 24
6012: NPS 2 to NPS 26
6013: NPS 2 to NPS 26 (outer shell NPS 4 to 36)
6014: Sizes are available to meet your application
(see bulletin 80.3:6014)
Introduction
6015: With outer shell. Sizes are available to meet
your application (see bulletin 80.3:6014)
End Connections
6010: Any combination of flanged (raised-face,
ring-type joint, and flat-face) or welded end (buttweld
or socket weld)
6011: Wafer flanged
Whisper Disk: Raised-face or ring-type joint flanged
6012 and 6013: Raised-face flanged, ring-type joint
flanged, or buttweld end
6014 and 6015: Raised-face flanged, ring-type joint
flanged, or buttweld end
Note
Inline and vent diffusers are not hydrostatically tested.
Scope of Manual
This instruction manual includes operation, installation, and maintenance information for the following diffusers:
D 6010, 6011, and Whisper Disk Inline Diffusers. See figure 1
D 6012 and 6013 drilled‐hole vent diffusers. See figures 2 and 3
D 6014 and 6015 WhisperFlo disc style vent diffusers. See figures 4 and 5
Do not install, operate, or maintain these diffusers without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson sales office
proceeding.
or Local Business Partner before
Description
Inline and vent diffusers are installed to provide backpressure for control valves, which greatly reduces control valve
noise generated by steam, gas, or vapor flow applications. Inline diffusers are placed downstream of the valve and are
either placed in or between pipe. Vent diffusers are placed downstream of the valve and vent process to the
atmosphere. Fisher inline and vent diffusers are used in gas, vapor, and steam applications.
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Instruction Manual
D103195X012
Inline and Vent Diffusers
June 2017
Principle of Operation
Inline and vent diffusers are custom designed to match a wide range of valve outlet and/or pipeline size. Furthermore
these diffusers are selected to match the application specific conditions including temperature, pressure, and flow
capacity. The flexibility of the diffuser types and placement provide a range of installation possibilities. The diffuser is
not required to be installed adjacent to the control valve.
The 6010 is an inline diffuser that fits between two different sizes of pipe to meet both downstream and upstream pipe
sizes with an integral outlet head. The 6011 is a pipe-style inline diffuser that extends into existing pipe using a wafer
flange connection. The Whisper Disk is a flat plate-style inline diffuser that is available with a raised-face flanged
connection. The 6012, 6013, 6014, and 6015 are vent diffusers that are designed to reduce noise during process
venting applications.
Piping Considerations
Upstream piping should be the same nominal diameter as the diffuser inlet connection and vice versa.
The drilled hole pattern of the Whisper Disk inline diffuser must be within the inside diameter of the mating flange
schedule.
Reducers or elbows are not recommended downstream unless they are at least four to five downstream pipe
diameters downstream of the diffuser outlet.
Installation
Before installation, all piping to the diffuser must be blown clean, so that no particles, such as welding beads, dirt or
other foreign matter, are left in the pipeline. Keep foreign matter away from the line openings while preparing the
diffuser for installation.
CAUTION
Cleanliness of the upstream piping is critical. Debris in the piping can damage the diffuser and severely restrict flow, causing
overpressure.
Inspect the inside of the diffuser and clean if necessary.
Arrange a lifting sling around the diffuser to safely place it into the mounting position.
Note
To avoid flow interaction and reduce noise in 6012, 6013, 6014, and 6015 vent diffuser applications, do not install diffusers in close
proximity to support structures and ensure that adjacent diffusers are installed at different heights.
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