Management of Change Guide
February 2017
D352703X012
Replacement of Fisher™ DSV High-Performance
Digester Switching Valve with Fisher 8580
Valve and 2052 Actuator
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
Valve Comparison ...........................................4
Scope, Size, Class ................................................................ 4
Capacity ............................................................................. 4
Face-to-Face Dimensions .................................................... 4
Body Style .......................................................................... 5
Shaft Size and Actuator Mounting ....................................... 5
Material Availability ............................................................ 6
Valve Body, Seal, Seal Retainer ............................................ 6
Actuator .........................................................6
Conclusion ......................................................6
Fisher DSV Valve and 1061 Actuator
Fisher 8580 Valve and 2052 Actuator
Management of Change
Management of Change (MOC) is a procedure used to proactively manage changes
that have the potential to impact safety or the process within a plant. Evaluating
new techniques for improving MOC approval procedures can have an impact on
plant efciency. Historically, upgrading obsolete products or replacing existing
process control equipment had been delayed or abandoned due to the extensive
paperwork involved in completing a complex MOC approval sheet.
Background
The Fisher DSV high-performance digester switching valve package was specically
designed for high-cycle, full stroke applications. The DSV valve used a speciallydesigned Fisher 8510 eccentric disk control valve with a 1061 pneumatic piston
rotary actuator created for rapid on/off, high-cycle, digester switching applications.
The valve body had no seal and the narrow body-to-disk proximity allowed the disk
to clean away scale build-up from the valve. The 1061 actuator featured a unique
sealing surface and piston combination that reduced wear during rapid cycling
operation.
MOC: DSV to 8580 Valve
February 2017
D352703X012
The DSV valve package is now obsolete and should be replaced with the Fisher
8580 high-performance buttery valve and 2052 pneumatic spring and diaphragm
actuator. The 8580 valve and 2052 actuator have been developed and tested
specically for use in high-cycle applications. A seal-less (ow ring) option is
available with the 8580 valve, which will provide the same narrow body-to-disk
proximity as the DSV valve. The seal-less (ow ring) construction allows the 8580
valve with 2052 actuator to directly replace the DSV package.
For more information regarding Fisher rotary valves, please contact your local
Emerson sales ofce.
Question & Answer Checklist
Q: Does the proposed modication cause any changes to the piping and
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instrumentation diagram (P&ID)?
A: No.
Q: Does the proposed modication change process chemistry,
technology, or operating and control philosophies?
A: No.
Q: Does the proposed modication change how the existing plant is
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operated?
A: No.
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Q: Does the proposed modication change process ows?
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A: No.
Q: Does the proposed modication change existing pressure relief cases?
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A: No.
Q: Does the proposed modication change the process description?
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A: No.
Q: Have the codes and standards to which the new equipment was
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designed changed?
A: No.
MOC: DSV to 8580 Valve
February 2017
D352703X012
Q: Does the proposed modication change the materials of construction,
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such as a change in material form (cast, forged, or alloy)?
A: No.
Q: Does the proposed modication introduce new equipment items that
require periodic predictive maintenance?
A: No.
Q: Does the proposed modication change existing operator training
requirements?
A: No.
Q: Does the proposed modication introduce new equipment items
that require spare parts, training manuals, maintenance procedures
or training to teach the maintenance department how to maintain
them?
A: No.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: No.
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Q: Does the proposed modication permanently remove the spares for
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existing pieces of equipment?
A: No.
Q: Does the proposed modication change the inspection scope or
inspection interval?
A: No.
Q: Does the proposed modication require welding work to be
performed?
A: No.
Q: Have the materials of construction been reviewed to ensure that the
metallurgy is correct?
A: No.
MOC: DSV to 8580 Valve
February 2017
D352703X012
Valve Comparison
The following sections are intended to provide a nominal comparison between DSV
valve and the 8580 valve.
Scope, Size, Class
The DSV valve was available in Class 300, NPS 4 through NPS 14. The 8580 valve can
replace the DSV valve up through NPS 12. For NPS 14, a Fisher 8532 valve will need
to be used.
Capacity
Some minor geometry changes, as well as increased analysis and testing
capabilities, cause the 8580 valve to have different ow coefcients than the DSV
valve. Refer to the 8580 valve product literature for the valve ow coefcients.
Face-to-Face Dimensions
The DSV package used a modied Class 300, 8510 valve body, which did not have
the same face-to-face length of the Class 300, 8580 valve. The standard 8580 valve
meets API 609 face-to-face dimensions for lugged category B valves. See Table 1 for
the dimensions of the two valve types.
When replacing a DSV valve with an 8580 valve, an option is available to match the
face-to-face length.
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DSV Valve 8580 Valve, Class 300
mm in mm in
NPS 4 56 2.19 53 2.09
NPS 6 57 2.25 57 2.24
NPS 8 64 2.50 73 2.87
NPS 10 71 2.81 83 3.27
NPS 12 81 3.19 92 3.62
Table 1. Standard Face-to-Face Dimensions
Body Style
The DSV valve was available in a wafer (angeless) valve body style only. The 8580
valve is available in a lugged (single ange) body style and can be supplied with
drilled-through ange holes, which allows the valve to be installed in the same
manner as a wafer valve body.
MOC: DSV to 8580 Valve
February 2017
D352703X012
Shaft Size and Actuator Mounting
The DSV and 8580 valves have the same shaft size and actuator mounting
dimensions. The actuator portion of the DSV package could be re-used on an 8580
valve, however the actuator sizing would need to be conrmed.
DSV Valve 8580 Valve, Class 300
mm in mm in
NPS 4 19 3/4 19 3/4
NPS 6 25 1 25 1
NPS 8 32 1 1/4 32 1 1/4
NPS 10 32 1 1/4 32 1 1/4
NPS 12 38 1 1/2 38 1 1/2
Table 2. Shaft Size
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MOC: DSV to 8580 Valve
February 2017
D352703X012
DSV 8580 DSV 8580
NPS 4
NPS 6
NPS 8
NPS 10
NPS 12
Table 3. Actuator Mounting Dimensions
mm 152 152 32 32
in 6.00 6.00 1.25 1.25
mm 152 152 32 32
in 6.00 6.00 1.25 1.25
mm 235 235 46 46
in 9.25 9.25 1.81 1.81
mm 235 235 46 46
in 9.25 9.25 1.81 1.81
mm 235 235 46 46
in 9.25 9.25 1.81 1.81
(Indicated in Figure 1)
T
(Indicated in Figure 1)
U
Material Availability
Generally, material availability is unchanged. The 8580 valve is available in the same
materials as the DSV valve.
Figure 1. Actuator Mounting Pad Dimensions
Valve Body, Seal, Seal Retainer
The DSV valve did not include a seal or seal retainer ring. The valve body was
machined to provide a specic clearance between the valve body and disk. To
replace the DSV valve, the 8580 valve should be specied with a ow ring. This ring
provides the same clearance between the valve body and disk of the DSV valve and
replaces the seal and seal retaining ring from the standard 8580 valve.
Actuator
The DSV package included a 1061 size 30 or 40 actuator with special options to
increase the cycle life capability of the actuator. This actuator can be replaced with
a standard 2052 size 1 or 2 actuator. The 2052 actuator has been designed and
tested for non-stop, high-cycle applications. It does not require any special options
to replace the 1061 actuator in the digester switching applications.
Conclusion
Emerson offers the Fisher 8580 valve and 2052 actuator as a replacement for the
obsolete Fisher DSV package. The 8580 valve must be specied with the ow ring
construction and may require the use of a face-to-face length option to directly
replace existing DSV valve installations.
For more information regarding the Fisher 8580 rotary valve, please contact your
local Emerson sales ofce.
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MOC: DSV to 8580 Valve
February 2017
D352703X012
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Emerson Automation Solutions
Fisher
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay, 68700 France
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