Management of Change Guide: Replacement of Fisher A-Body Control Valves with easy-e Control Valves
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Management of Change Guide
September 2018 / D352308X012
Replacement of Fisher™ Double-Ported
A-Body Control Valves with Fisher easy-e™
Sliding-Stem Control Valves
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................3
A-Body and easy-e Control Valve
Comparison ...................................................5
Capacities (Cv) by Size ........................................................ 5
Face-to-Face Dimensions .................................................... 7
Shutoff Class ....................................................................... 8
Trim Materials ..................................................................... 8
Product Features ................................................................ 9
Approximate Control Valve Assembly Weights .................... 9
Conclusion .....................................................10
Additional Resources .....................................10
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.
Contained in the following sections are design comparisons between inactive
Fisher double-ported A and AR control valves, and current Fisher easy-e ED and ET
control valves. Fisher double-ported A and AR control valves will be referenced as
“Fisher A-body” throughout this document; Fisher easy-e ED and ET control valves
will be referenced as “Fisher easy-e.” These comparisons are intended to help endusers understand the similarities and differences between Fisher A-body and Fisher
easy-e control valves and to complete MOC approval documents for an efcient
and safe transition.
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
Background
Fisher A-Body control valves are double-ported balanced designs with a variety of
characteristics, valve plug guiding options, and material offerings allowing them
to be used in a wide range of industrial applications as rugged, high-capacity
globe valves. Direct-acting Fisher A-body or reverse-acting (AR) control valves are
compatible with many spring-and-diaphragm or piston actuators. NPS 1, 1 ¼ and
1 ½ Fisher A-body control valves are obsolete products and the 10-year guarantee
of recommended spare parts availability for these products ended in 2000. NPS 2
thru 16 Fisher A-body control valves are inactive Fisher products, with limited parts
availability and increased lead time for new assembly orders.
Fisher A-body control valves have been general service control valves for
several decades, still used within various service applications. Due to modern
advancements in control valve technology, which allow for smaller actuation,
tighter shutoff, and more material choices, Fisher A-body control valves have been
declared obsolete to transition to recently developed control valves. Fisher easy-e
control valves are offered as replacements for Fisher A-body control valves based on
shared actuation platforms and the wide ranges of trim and material options.
The Fisher easy-e series is comprised of ED, ES, ET, EZ, and EW constructions; this
document will specically discuss ED and ET control valves. Fisher ED control valves
most closely match the capabilities of Fisher A-body control valves within a wide
range of operating temperatures. Fisher ET control valves are also similar, but offer
PTFE trim seals and seat options, and tighter shutoff at lower temperatures. Fisher
easy-e control valves are cage guided, single-port globe valves, with balanced valve
plugs in a quick change trim design that simplies maintenance. These control
valves are generally used for throttling or on-off control applications for a wide array
of liquids and gases. For more information regarding other Fisher easy-e control
valves, please contact your local Emerson sales ofce.
2
Question & Answer Checklist
Q: Does the proposed modication cause any changes to the piping and
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2
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instrumentation diagram (P&ID)?
A: Possibly. If the control valve size changes, concentric reducers to the
control valve inlet and outlet may need to be added to the P&ID.
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
operated?
A: Possibly. Review capacity information (page 7, Table 1) to ensure no
issues will take place.
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
Q: Does the proposed modication change process ows?
4
A: Possibly. Review capacity information (Table 1) to ensure no issues will
take place.
Q: Does the proposed modication change the process description?
5
A: No.
Q: Have the codes and standards to which the new equipment was
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7
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designed changed?
A: No, although they may have been updated since Fisher A-body control
valves were installed.
Q: Does the proposed modication change the materials of construction,
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. The new equipment items will require the same periodic
maintenance as required by the revious equipment items.
Q: Does the proposed modication change existing operator training
9
requirements?
A: No.
3
Q: Does the proposed modication introduce new equipment items
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11
12
that require spare parts, training manuals, maintenance procedures
or training to teach the maintenance department how to maintain
them?
A: Yes. Emerson sales ofces offer local training and support to help
ensure operators, maintenance personnel, and instrument technicians
are trained on Fisher easy-e control valves.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: Yes.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: Yes. New spares are required for Fisher easy-e control valve that are
not compatible with Fisher A-body control valves, with the exception
of some shared Fisher valve packing kits.
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
Q: Does the proposed modication change the inspection scope or
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14
15
16
inspection interval?
A: No.
Q: Does the proposed modication require welding work to be
performed?
A: Possibly. Welding requirements will depend on valve ange
connection.
Q: Does the proposed modication change existing pressure relief cases?
A: Probably. If Fisher easy-e control valve replacement selections exceed
the maximum rated Cv of the existing Fisher A-body, then pressure
relief cases will require evaluation. Review capacity information (Table
1) to ensure no issues will take place.
Pressure relief valve sizing is not considered when sizing and selecting
Fisher control valves for end-user applications. If the control valve is
determined to affect upstream or downstream safety relief cases,
review by the end user or third party is recommended.
Q: Have the materials of construction been reviewed to ensure that the
metallurgy is correct?
A: Yes.
4
A-Body and easy-e Control Valve Comparison
The following tables are intended to provide a nominal comparison between Fisher
A-body and Fisher easy-e control valves, specically Fisher ED and ET. Specications
for other Fisher easy-e control valves will vary from the tables below; contact your
Emerson local business partner or sales ofce for unlisted models or congurations.
Capacities (Cv) by Size
Due to differences in ow geometry and small variations in sizing coefcients, each
control valve should be reviewed to ensure appropriate Fisher easy-e control valves
are selected for each application. This sizing review should be completed using
current Fisher valve sizing software. Table 1 provides necessary catalog sizing and
capacity information to compare Fisher A-body and Fisher easy-e control valves.
For more information on control valve sizes and ow characteristics, please contact
your local Emerson sales ofce.
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
Figure 1. Fisher A-Body Control Valve
Both quick opening and equal percentage ow characteristics are the same in
Fisher A-body and Fisher easy-e control valves. Fisher A-body control valves have
a “modied parabolic” ow characteristic following a curve similar to linear ow.
Figure 3 illustrates the percent of rated ow coefcient, dictated by the percent of
rated travel. Complete ow curves for specic characteristics and sizes can be found
by contacting your Emerson local business partner or sales ofce.
Figure 2. Fisher easy-e Control Valve
100
Quick-Opening
Linear
Rated Flow Coefficient (%)
0
Rated Travel (%)
Figure 3. Fisher easy-e Control Valve
Percent of Rated Flow
Equal-Percentage
100
5
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
NPS
1 19.1 22.1
1 ¼ 23.8 22.1
1 ½* 29.3 29.9 18.1 29.2 12.0 23.1
1 ½ 45.0 44.0
2* 43.8 31.2 27.6 33.3 21.1 24.3
2 56.2 77.6
2 ½* 67.5 71.2 34.9 57.0 30.2 43.9
2 ½ 90.3 109
3* 105 91.9 52.6 102 46.7 70.7
3 124 161
4* 163 130 85.0 113 74.3 112
4 243 251
5* 219 -- 130 -- 118 --
5 323 --
6* 385 358 185 322 170 274
6 597 460
8* 607 -- 312 -- 314 --
8 1025 --
8
(max travel 2 in)
8
(max travel 3 in)
10 1580 -- 1320 -- 1110 --
10 x 6 -- 637 -- 617 -- 508
10 x 8 -- 1040 -- 975 -- 924
12 2380 -- 1760 -- 1680 --
12
(max travel 4 in)
12
(max travel 5 in)
16 3390 -- 2760 -- 2760 --
16
(max travel 4 in)
16
(max travel 5 in)
Table 1. Capacities (Cv) by Size
Quick Opening Linear (Modied Parabolic) Equal Percentage
Fisher A-Body Fisher easy-e Fisher A-Body Fisher easy-e Fisher A-Body Fisher easy-e
12.6 (high and low lift)
15.8 (throttle)
22.5 (high and low lift)
22.8 (throttle)
32.0 (high and low lift)
34.1 (throttle)
53.1 (high lift)
51.4 (low lift)
57.0 (throttle)
74.6 (high lift)
80.8 (low lift)
71.0 (throttle)
121 (high lift)
105 (low lift)
107 (throttle)
190 (high lift)
134 (low lift)
203 (throttle)
289 (high lift)
215 (low lift)
308 (throttle)
438 (high lift)
442 (low lift)
467 (throttle)
765 (high lift)
715 (low lift)
843 (throttle)
-- 744 -- 688 -- 576
-- 1040 -- 975 -- 924
-- 1500 -- 1500 -- --
-- 1570 -- 1570 -- 1397
-- 1753 -- 1601 -- --
-- 1601 -- 1875 -- 1595
20.6 12.5 17.2
20.6 20.1 17.2
39.2 31.0 35.8
72.9 51.6 59.7
108 72.0 99.4
148 116 136
236 196 224
-- 304 --
433 490 394
-- -- --
6
Face-to-Face Dimensions
Face-to-face dimensions (dimension “A,” illustrated in Figures 4 and 5) of each
control valve size are generally the same between Fisher A-body and Fisher easy-e
control valves. Reference Table 2 for any dimension differences, particularly if a
different Fisher easy-e control valve size is needed, a screwed end connection is
used, or the pressure rating was previously CL400. See Figures 4 and 5.
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
Figure 4: Fisher A-Body Control Valve
Face-to-Face Dimensions
Screwed BWE CL150 RF
NPS
Size
1 6.0 8.3 8.3 8.3 7.2 7.2 7.8 7.2 7.8 7.8 8.3 8.3 8.3 --- 8.3 --- 8.3 8.3 8.3 8.3
1 ¼ 6.0 9.0 9.0 --- 7.9 --- 8.4 --- 8.4 --- 8.9 --- 9.0 --- 9.0 --- 9.0 --- 9.0 ---
1 ½ 7.8 9.9 9.9 9.9 8.7 8.7 9.3 9.3 9.3 9.3 9.8 9.8 9.9 --- 9.9 --- 9.9 9.9 9.9 9.9
2 9.1 11.3 11.3 11.3 10.0 10.0 10.5 10.5 10.5 10.5 11.1 11.1 11.3 --- 11.4 --- 11.3 11.3 11.4 11.4
2 ½ --- --- 12.2 12.2 10.9 10.9 11.4 11.5 11.5 11.5 12.1 12.1 12.2 --- 12.4 --- 12.2 12.2 12.4 12.4
3 --- --- 13.3 13.3 11.7 11.7 12.2 12.2 12.2 12.5 13.1 13.1 13.3 --- 13.4 --- 13.3 13.3 13.4 13.4
4 --- --- 15.5 15.5 13.9 13.9 14.4 14.4 14.5 14.5 15.1 15.1 15.2 --- 15.4 --- 15.5 15.5 15.6 15.6
5 --- --- 18.0 --- 15.9 --- 16.4 --- 16.7 --- 17.5 --- 17.6 --- 17.6 --- 18.0 --- 18.1 ---
6 --- --- 20.0 20.0 17.8 17.8 18.3 18.3 18.6 18.6 19.3 19.3 19.5 --- 19.6 --- 20.0 20.0 20.1 20.1
8 --- --- 24.0 24.0 21.4 21.4 21.9 21.9 22.4 22.4 23.0 23.0 23.4 --- 23.5 --- 24.0 24.0 24.1 24.1
10 --- --- 29.6 29.6 26.5 26.5 27.0 --- 27.9 27.9 28.5 28.5 28.9 --- 29.0 --- 29.6 29.6 29.8 29.8
12 --- --- --- 32.2 29.0 29.0 29.5 --- 30.5 30.5 31.1 31.1 --- --- --- --- 32.2 32.2 32.4 32.4
16 --- --- --- --- 40.4 --- --- --- 42.0 --- --- --- --- --- --- --- 44.0 --- --- ---
Table 2. Face-to-Face Dimensions
Figure 5: Fisher easy-e Control Valve
Face-to-Face Dimensions
CL150
RTJ
CL300 RF
inches
CL300
RTJ
CL400 RF
CL400
RTJ
CL600 RF CL600
7
Shutoff Class
Fisher easy-e ED control valves have the same standard shutoff (Class II) as Fisher
A-body control valves, while Fisher easy-e ET control valves have Class IV standard
(seen in Table 3). Fisher easy-e control valves have tighter shutoff capabilities,
dependent on trim selection.
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
Typ e NPS Size
II III IV V VI
Shutoff Class
Fisher A-Body All Standard Optional --- --- ---
Fisher easy-e All Standard (ED) Optional (ED)
Table 3. Shutoff Class
Standard (ET)
Optional (ED)
Optional
(ED/ET)
Optional (ET)
Trim Materials
Fisher easy-e control valves are available with a wide range of trim materials; the
most common trim designations are listed in Table 4. Materials not listed may be
available upon request. For more information, please contact your Emerson local
business partner or sales ofce.
Trim
Fisher
A-Body
Fisher
easy-e
Table 4. Trim Material
Valve Plug Seat Ring Guide Bushing
1 S31600 S31600 S17400
3 S31600/CoCr-A S31600/CoCr-A S31600/CoCr-A
6 S31600/CoCr-A S31600/CoCr-A S31600/CoCr-A
7 S17400 S17400 S17400
9 N04400 N04400 N05500
Valve Plug Seat Ring Cage
1 S41600 HT S41600 HT or CA15 HT CB7Cu-1 HT
3 S31600/CoCr-A R30006 R30006
4 S31600 S31600 CB7Cu-1 HT
27 S31600/CoCr-A R30006 CB7Cu-1 HT
28 S31600/CoCr-A R30006 CF8M/ENC
29 S31600 S31600 CF8M/ENC
37 S31600/CoCr-A R30006 CF8M/ENC
85 (NACE) S31600 S31600 CF8M/ENC
87 (NACE) S31600/CoCr-A CoCr-A CF8M/ENC
Material
8
Product Features
Fisher A-body and Fisher easy-e control valve features are very similar; Table 5
provides a concise side-by-side comparison for product features not addressed in
other sections.
Fisher A-Body Fisher easy-e
Body
CL125, CL150, Cl250, CL300,
CL400, CL600
CL125, CL150, CL250, CL300,
CL600
Plug Design Balanced Balanced
Packing
Flow
Characteristics
Table 5. Product Features
PTFE and graphite single,
double and ENVIRO-SEAL™
Quick Opening, Modied
Parabolic, Equal Percentage
PTFE and graphite single,
double and ENVIRO-SEAL
Quick Opening, Linear, Equal
Percentage
Approximate Control Valve Assembly Weights
Fisher easy-e control valves tend to be lighter than Fisher A-body control valves, but
not in all cases. The exact weight of a specic assembly is dependent upon body
material, trim, end connections, etc. Table 6 is intended to give a general sense of
the weight differences. For more specic numbers, please contact your Emerson
local business partner or sales ofce.
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
NPS Size
Fisher A-Body Fisher easy-e
Pounds
1 47 30
1 1/4 47 30
1 1/2 88 45
2 101 85
2 1/2 155 100
3 196 125
4 316 170
6 587 350
8 908 900
10 1608 --
10 x 6 -- 950
10 x 8 -- 1640
12 2056 3100
16 5134 5600
Table 6. Approximate Assembly Weight
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Conclusion
Fisher control valves have been used in the process control industry for over 130
years. Emerson offers Fisher easy-e control valves as replacements for inactive Fisher
A-body control valves. Fisher easy-e control valves offer quick change trim for ease
of maintenance, reduced parts complexity, spare parts availability and support, as
well as improved lead times.
Additional Resources
Contact your local Emerson sales ofce for additional details or questions regarding
Fisher easy-e control valves or refer to the documents below.
EZ Valve Instruction Manual (D100401X012)
easy-e Valve Brochure (D350365X012)
MOC: A-Body to easy-e Valves
September 2018 / D352308X012
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