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Management of Change Guide: Replacing Fisher CP Valves with Fisher GX Control Valves
Manuals & Guides
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Fisher Management of Change Guide: Replacing Fisher CP Valves with Fisher GX Control Valves Manuals & Guides

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Replacement of CP Valves with Fisher™ GX Control Valves
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
Management of Change Guide
September 2018 / D352214X012
Fisher CP Valve and GX Valve Comparison .......4
Conclusion ......................................................8
Additional Resources ......................................9
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 efciency. 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 CP valve was developed to meet the specic requirements of the
chemical industry and was the primary offering for the industrial process application
segment of the chemical industry until 2005. The CP was a globe-style, single-port valve with integral anges, stem guiding, and a clamped-in seat ring. The CP valve is
an obsolete Fisher product and spare parts support for it will end in 2015.
The Fisher GX is a compact, multi-spring actuator and globe valve system that can meet the requirements of the chemical market. The GX valve is rugged, reliable, and easy to select. It requires no actuator sizing—the actuator selection is
automatic once the valve body construction and available plant air supply pressure are selected. A key feature of the GX valve is the ability to integrally mount the FIELDVUE™ DVC2000 or DVC6200 digital valve controller for linkage-less position
feedback. With a global installed base of nearly 100,000 units, the GX is a proven
and reliable control valve solution for a wide array of applications across a broad range of industries.
MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
Contained in the following sections are design comparisons between the current Fisher GX control valve and obsolete Fisher CP control valve. These comparisons are intended to help end users complete MOC approval documents to understand the similarities and differences between GX and CP valves to effectively transition to the GX valve.

Question & Answer Checklist

Q: Does the proposed modication cause any changes to the piping and
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instrumentation diagram (P&ID)?
A: No.
Q: Does the proposed modication change process chemistry,
technology, or operating and control philosophies?
A: No.
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Q: Does the proposed modication change how the existing plant is
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operated?
A: Possibly. Review capacity information to help ensure no issues will
take place.
Q: Does the proposed modication change process ows?
A: Possibly. Review capacity information to help ensure no issues will
take place.
Q: Does the proposed modication change existing pressure relief cases?
A: Possibly. If the GX replacement selection exceeds the maximum rated
Cv of the existing CP valve, then pressure relief cases will require
review. Pressure relief valve sizing when sizing and selecting Fisher control valves for end user applications is not considered. If the control valve is determined to affect upstream or downstream safety relief
cases, review by the end user or third party is recommended.
MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
Q: Does the proposed modication 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.
Q: Does the proposed modication change the materials of construction,
such as a change in material form (cast, forged, or alloy)?
A: No.
Q: Does the proposed modication 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 previous equipment items.
Q: Does the proposed modication change existing operator training
requirements?
A: No.
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Q: Does the proposed modication introduce new equipment items
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that require spare parts, training manuals, maintenance procedures
or training to teach the maintenance department how to maintain them?
A: Yes. The Emerson local business partners and sales ofces offer local
training and support to help ensure operators, maintenance personnel,
and instrument technicians are trained on the GX control valve.
Q: Does the proposed modication introduce new equipment items that
require spares or obsolete spares for existing equipment?
A: Yes. New spares will be required for the Fisher GX valve, which are
not compatible with the CP valve. Spare trim parts will continue to be available for the CP valve until the end of 2015.
Q: Does the proposed modication permanently remove the spares for
existing pieces of equipment?
A: Yes. The spare parts of the existing equipment items should be
removed from the plant.
MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
Q: Does the proposed modication change the inspection scope or
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inspection interval?
A: No.

Fisher CP Valve and GX Valve Comparison

The Fisher GX valve is capable of being used in a broad range of industries and applications. It has been designed as the direct replacement for the CP valve.
The tables and sections below describe the similarities and differences between these two products.

Capabilities by Size

Due to differences in ow geometry and small variations in sizing coefcients,
each valve should be reviewed to help ensure the appropriate GX valve is selected for the application. This sizing review should be completed using current Fisher sizing software. The table below provides the necessary catalog sizing and capacity information to compare the CP valve to the GX valve.
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Typ e NPS Size
CP 1
GX 1
CP 1.5
GX 1.5
CP 2
GX 2
CP 3
GX 3
Capacity (Unbalanced) ∆P (bar) Shutoff Class
Full Port size Cv Reduced Port Size Cv Full Port delta P
4.8mm 0.667
=% 19mm 10.9 =%
Linear 19mm 11.00 Linear
6.4mm 1.59
9.5mm 3.50
12.7mm 5.63
9.5mm 3.30
12.7mm 5.79
20mm 51.7
9.5mm 1.65
=% 22mm 13.7 =%
9.5mm 3.57
14mm 6.89
4.8mm 0.039
Linear 22mm 15.5 Linear
4.8mm 0.139
4.8mm 0.294
4.8mm 0.785
22mm 51.7
9.5mm 3.7
14.0mm 7.8
=% 28.6mm 25.2 =%
Linear 28.6mm 24.8 Linear
=% 36mm 27.2 =%
Linear 36mm 32.0 Linear
=% 38.1mm 45.7 =%
Linear 38.1mm 46.3 Linear
=% 46mm 43.7 =%
Linear 46mm 48.6 Linear
=% 64mm 109 =%
Linear 64mm 111 Linear
=% 70mm 95.1 =%
Linear 70mm 117 Linear
12.7mm 5.91
19mm 12.2
12.7mm 6.08
19mm 12.5
14mm 6.87
22mm 14.3
14mm 8.25
22mm 17.2
19mm 12.0
28.6mm 25.6
19mm 12.3
28.6mm 27.6
22mm 14.3
36mm 28.6
22mm 17.2
36mm 33.9
28.6mm 25.5
47.6mm 69.9
28.6mm 27.6
47.6mm 74.4
36mm 28.6
46mm 43.7
36mm 33.3
46mm 51.8
28.6mm 51.7
36mm 51.7
38.1mm 51.7
46mm 51.7
64mm 51.7
70mm 33.1
MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
Reduced
Port
4.8mm
6.4mm
9.5mm
12.7mm
4.8mm
4.8mm
4.8mm
4.8mm
9.5mm
14mm
12.7mm
19mm
14mm
22mm
19mm
28.6mm
22mm
36mm
28.6mm
47.6mm
36mm 51.7
46mm 48.4
delta P IV V VI
51.7 Standard
51.7 Standard
51.7 Standard
51.7 Standard
51.7 Standard
51.7 Standard
51.7 Standard
Standard
Optional
Metal Seats
Optional
Metal Trims
Optional
Metal Seats
Optional
Metal Trims
Optional
Metal Seats
Optional
Metal Trims
Optional
Metal Seats
Optional
Metal Trims
Optional
Composition
Seats
Optional
PTFE
Seats
Optional
Composition
Seats
Optional
PTFE
Seats
Optional
Composition
Seats
Optional
PTFE
Seats
Optional
Composition
Seats
Optional
PTFE
Seats
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MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
Typ e NPS Size
GX 3
Typ e NPS Size
CP 4
GX 4
Typ e NPS Size
GX 4
Table 1. Capabilities by Size
Capacity (Balanced) - Only Used for Bellows ∆P (bar) Shutoff Class
Full Port size Cv
=% 70mm 75.7 =% n/a n/a
Linear 70mm 102 Linear n/a n/a
Capacity (Unbalanced) ∆P (bar) Shutoff Class
Full Port size Cv Reduced Port Size Cv Full Port delta P
=% 83mm 179 =%
Linear 83mm 195 Linear
=% 90mm 165 =%
Linear 90mm 184 Linear
Capacity (Balanced) - Only Used for Bellows ∆P (bar) Shutoff Class
Full Port size Cv
=% 90mm 128 =% 90mm 68.5
Linear 90mm 151 Linear 90mm 92.3
Restricted
Restricted
Port Size Cv Full Port delta P
70mm 51.7 70mm 51.7
38mm 47.8
64mm 117
38mm 48.6
64mm 128
46mm 44.0
70mm 97.7
46mm 52.2
70mm 128
Port Size Cv Full Port delta P
83mm 51.7
90mm 20
90mm 51.7 90mm 51.7
Restricted
Reduced
Port
38mm
64mm
46mm 48.4
70mm 33.1
delta P IV V VI
Restricted
delta P II IV
51.7 Standard
Standard
delta P II IV
Graphite
Piston
Ring
Optional
Metal Seats
Optional
Metal Trims
Graphite
Piston
Ring
PTFE Seal
Ring
Optional
Composition
Seats
Optional
PTFE
Seats
PTFE Seal
Ring

Alloy Material Comparison

Please see the table below for alloy materials. It is important to note the Fisher GX
CN7M valve body is only supplied with Hastelloy C trim.
Typ e
NPS Size
CF3M WCC CN7M MONEL CW2M CF3 N7M LCC CD3MN
CP All X X X X X X X X
GX All X X X X X X X X X
Table 2. Material Availability
Body Material

ISA Long Face-to-Face Dimension

The CP valve offered an optional ISA long face-to-face dimension valve body. While the use of spool pieces or concentric reducers could be used to make up
the difference between ISA long and ANSI standard face to face dimensions, the GX valve is also offered in ISA long congurations in specic standard and alloy
materials. Table 3 below highlights the differences between CP and GX valves.
Typ e NPS Size
CP 1 X X X X X X X X
GX 1 X X X X
CP 1.5 X X X X X X X X
WCC CF3M CW2M LCC CN7M MONEL CF3 N7M
Body Material
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MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
Typ e NPS Size
GX 1.5 X X X X
CP 2 X X X X X X X X
GX 2 X X X X
CP 3 X X X X X X X X
GX 3 X X X
CP 4 X X X X X X X X
GX 4 X X X
WCC CF3M CW2M LCC CN7M MONEL CF3 N7M
Body Material
Table 3. ISA Long Face-to-Face Availability by Material

Bellows Comparison

Please see the below table of bellow material options. It is important to note the NPS 3 and NPS 4 GX valves are limited to 20mm travel. In some scenarios this will restrict your balanced or reduced port trim options.
Typ e NPS Size Body Material CF3M WCC CW2M LCC
CP 1-2
GX 1-2
CP 3-4
GX 3-4
Bellows Material
Bellows Material
Table 4. Bellows Availability
Inconel Inconel Hastelloy C n/a
SST
Hastelloy C
Inconel Inconel Hastelloy C n/a
SST
Hastelloy C
SST
Hastelloy C
SST
Hastelloy C
Hastelloy C
Hastelloy C
Hastelloy C
Hastelloy C
SST
SST

Valve and Actuator Features

The Fisher CP and GX valves share many standard features as described in Table 5 below. One design difference between the CP valve and the GX valve is the bonnet. The GX bonnet is clamped between the valve body and actuator yoke. This provides
reduced complexity, size, and weight from the traditional bolted-on bonnet design
of the CP valve.
The GX valve also shares a number of parts across valve sizes. These include plug/
stem assemblies, actuator stems and stem connectors, actuator seals and bushings, and packing components for reduced complexity of spare parts inventory.
Tables 5 and 6 showcase the valve features and actuator features, respectively.
Valv e CP GX
Body
Plug Design Unbalanced only – Post Guided
Seat Ring Clamped Threaded
Packing ENVIRO-SEAL™ Standard ENVIRO-SEAL Standard
Cv Capacities See Table 1 See Table 1
CL150, CL300
ISA Long F-F Option (see Table 2)
CL150, CL300
ISA Long F-F Option (see Table 2)
Balanced & Unbalanced – Port
Guided
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Pressure Drop See Table 1 See Table 1
Shutoff Class See Table 1 See Table 1
Flow Direction Up or Down Up
Flow Characteristics Equal Percentage and Linear Equal Percentage and Linear
Trim Materials
Temperature Capabilities -325° to 800°F - 325° to 700°F
1. 700°F is the Fisher GX ENVIRO-SEAL Graphite ULF packing system temperature limit.
316L Standard
Alloy matches body
316L standard
Alloy matches body (CN7M body
w/ N06022 trim)
Table 5. Valve Features
AC TUATO R CP (657, 667) GX
Operating Pressure
Bench Set
Actuator Fail Action Up (657) or Down (667)
Instrument Availability Standard bracket mount
Sizes 30, 34, 40, and 45 2 Sizes (225 and 750)
Cycle Life Spring selection specic 1,000,000 cycles
Requires spring selection, sizing, and
0-18 6-30
bench set
4 bar (60 psi) standard
3 bar (45 psi) optional 2 bar (30 psi) optional
No adjustment or sizing required
Both available
Field-reversible
Integral FIELDVUE instrument
mounting. Pneumatics available with
standard bracket mount.
Table 6. Actuator Features
MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
1

Conclusion

The 2005 obsolescence of the Fisher CP valve will end spare parts availability at
the end of 2015. The Fisher GX control valve offers compatible sizes, features, and
materials to cover the wide range of customer application needs and is the direct replacement for the Fisher CP control valve.
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Additional Resources

See the resources below or contact your local Emerson sales ofce for additional details or questions regarding the Fisher GX control valve.
GX Product Bulletin (D103171X012)
GX Instruction Manual (D103175X012)
GX Product Webpage
MOC: Replacement of CP with GX Valves
September 2018 / D352214X012
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