CVX Valve
February 2020
Instruction Manual
D103606X012
Fisher™ CVX Steam Conditioning Valve
Figure 1. Fisher CVX Steam Conditioning Valve
Contents
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and operation information for the Fisher CVX control valve.
Refer to separate instruction manuals for instructions covering the actuator and accessories.
Do not install, operate, or maintain a CVX valve 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 before proceeding.
Description
and temperature within a single device. Typical installations include steam backpressure control, turbine bypass,
boiler start‐up service, auxiliary steam letdown for drying rolls, kettles, equipment drives, plant heating, and other
loads requiring dependable and accurate control of steam pressure and temperature.
CVX Valve
February 2020
Instruction Manual
D103606X012
power plants as well as provide precise pressure and temperature control for process applications. The CVX
incorporates over 30 years of steam conditioning experience and product development. The valve body is designed
with the latest finite element analysis (FEA) and computational fluid dynamics (CFD) tools to optimize performance
and reliability for demanding steam systems.
The CVX valve design provides an exceptional combination of performance and maintainability. The simplified trim
configuration is thermally compensated to handle rapid changes in temperatures, as expected during a turbine trip,
without any sticking or binding.
Water atomization and vaporization are key elements in any steam conditioning application. The CVX incorporates a
spraywater manifold of variable geometry Type AF nozzles producing a spray pattern suitable for high rangeability
applications. These nozzles are strategically placed to achieve complete mixing and quick vaporization at all flowing
conditions. Years of research in spray atomization and vaporization were key to optimizing the water injection system.
Extensive use of CFD analysis, in addition to field performance feedback, was used to validate spray system
enhancements.
Educational Services
For information on available courses for the Fisher CVX steam conditioning valve, as well as a variety of other products,
contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: 1-641-754-3771 or 1-800-338-8158
E-mail: [email protected]
emerson.com/fishervalvetraining
Principle of Operation
an array of orifices to provide the control characteristic specified. As the plug is lifted from the seat, steam is permitted
to pass into the center of the control cage, and out through the seat orifice. A signal from the pressure control loop to
the valve actuator moves the valve plug within the control cage, which increases or decreases the amount of free flow
area. Retracting the plug increases steam flow.
The outlet section of the valve is comprised of a combination acoustical diffuser / cooler section. As the steam exits the
seat orifice, it enters a diffuser section designed to further decrease steam pressure. Flow is directed radially, through
the multiple orifice diffuser to the outlet pipe. The outlet section is fitted with cooling nozzles connected to a water
manifold. This manifold provides cooling water flow to individual cooling nozzles installed in the pipe wall of the outlet
section. The result is the creation of a fine spray mist injected into the highly turbulent outlet steam flow.
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CVX Valve
February 2020
Instruction Manual
D103606X012
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
Personal injury or equipment damage caused by sudden release of pressure may result if the CVX valve is installed where
service conditions could exceed the limits of the pressure rating noted on the nameplate. To avoid such injury or damage,
provide a relief valve for over pressure protection as required by government or accepted industry codes and good
engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
CAUTION
result in parts damage, malfunction of the valve, or loss of control of the process. Do not expose this valve to service
conditions or variables other than those for which this valve is intended. If you are not sure what these conditions are, you
should contact Emerson Automation Solutions for more complete specifications. Provide the product serial number
(shown on the nameplate) and all other pertinent information.
Check that the CVX valve is properly orientated with respect to the flow direction of the valve (flow down). Incorrect
installation can result in damage to the valve and poor performance.
1. Before installation, all piping upstream of the valve must be blown clean so that no loose materials such as welding
slag, dirt or other foreign matter, are left in the pipe. Use care to keep foreign matter out of the line openings while
preparing the valve installation.
2. If possible, before fitting in the line, connect the actuator to a temporary air supply and operate to verify
positioning. Disconnect the instrument lines (if applicable).
WARNING
Do not lift the valve by its actuator yoke or cooler manifold piping. Lifting lugs attached to the actuator must not be used
to lift the complete valve assembly unless clearly marked as being rated to support the complete valve assembly
weight. Personal injury or damage to equipment could occur if the valve is improperly lifted into place.
All lifting and rigging must be completed in accordance with federal/national/provincial, state and local regulations
and applicable lifting and rigging equipment standards. Only personnel trained in proper lifting and rigging practices
shall perform valve/actuator assembly lifting, rigging and installation. Because each lift will be unique, the method of
lifting the valve assembly, the correct location for attaching and lifting the valve assembly, and what the valve
assembly will do when lifted shall be considered for each lift.
Lifting and rigging equipment used to lift, install or remove a valve assembly or component must be properly selected
and sized for the weight and configuration of the valve assembly or component being lifted. The weight of the
complete valve assembly, including attached accessories, must be taken in consideration for this purpose. The lifting
and rigging equipment must be properly maintained and inspected for damage before each use.
Lifting lugs or other lifting equipment attached to the valve or actuator must never be used to lift or support the
weight of attached piping.
If the CVX is equipped with buttweld ends, the valve body must be supported using a lifting sling or other method that does
not place a load or force onto the finished surface of the buttweld ends. The CVX does not have a stable resting position.
The valve inlet and outlet must be fully supported until fully welded (buttweld end connections) or bolted (flanged end
connections) into the piping.
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February 2020
Instruction Manual
D103606X012
CAUTION
Care must be taken when lifting the valve/actuator assembly to ensure all accessories and tubing are not damaged in
the process. Accessories and tubing may need to be removed prior to lifting to prevent damage and properly
reinstalled before use. Protect valve flange faces, butt weld ends, and other connection surfaces from damage during
lifting.
3. Arrange lifting slings, or other lifting and rigging equipment appropriate for the valve weight and configuration
around the main valve body to safely lift the valve to the pipe opening.
WARNING
Do not expose the valve to undue stresses by installing it in bent pipes or flanges. Personal injury and equipment damage
could result from flange sealing failure due to improper installation.
4. Flanged Connections—Lubricate the flange connection bolts with a high temperature thread lubricant. Install flange
gaskets and connection bolts per accepted practices and tighten securely.
5. Welded Connections—Welding procedures should be in accordance with the applicable codes and the base
materials. For preheat, welding electrodes, and postweld heat treatment, refer to the applicable codes and
practices applicable for the specific facility. Materials are specified on the customer specification sheet. Emerson
Automation Solutions recommends the valve be disassembled for welding, however if the valve inlet and outlet
connections are to be welded with the valve assembled, the valve plug should be maintained off the valve seat
during all associated operations. If the valve is to be welded by SMAW process, the valve must be disassembled for
welding to ensure that any weld slag is removed from the valve.
CAUTION
Depending on valve body materials used, post weld heat treating may be required. If so, damage to internal parts is
possible. In general, if post weld heat treating is to be performed, all trim parts and nozzles should be removed. Contact
your Emerson Automation Solutions sales office for additional information.
6. Remove the spraywater control valve and flush the cooling water line until all debris is removed from the line prior
to connecting it to the CVX valve. Use only clean sources of cooling water to reduce the possibility of nozzle
clogging. A strainer should be installed in the water line as close to the CVX valve as possible. To determine
appropriate mesh size, refer to valve sizing and specification document, or contact your Emerson sales office.
Review strainer manufacturer's pressure drop curves to determine appropriate strainer body size. You may need to
use a strainer that is larger than the water line size.
WARNING
Failure to use a strainer could result in nozzle clogging and subsequent property damage or loss. Uncontrolled
temperatures resulting from clogged nozzles may result in equipment or process temperature limits being exceeded.
Exceeding system temperature limits could result in property damage or personal injury.
7. A length of straight pipe is required downstream of the CVX valve to ensure complete vaporization of cooling water.
of straight pipe. This is unique for each application and is supplied by Emerson.
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February 2020
Instruction Manual
D103606X012
8. Typically, a temperature sensor should be mounted downstream of the CVX valve. This distance will vary depending
on a number of factors including steam velocity and percentage of spraywater. Consult the cooler sizing sheet
provided with the unit for this temperature sensor distance. The steam line should not have any branch lines
dividing the steam flow between the CVX valve and the temperature sensor. If you have any questions, contact your
Emerson sales office.
9. A typical installation is illustrated in figure 2. A pressure transmitter senses the pressure downstream (or upstream
in backpressure control applications). The pressure controller sends a signal to the actuator positioner opening or
closing the CVX valve as required to maintain pressure. A rising stem opens the CVX valve to allow additional steam
flow. A temperature sensor (TE) measures changes in temperature and a temperature transmitter (TT) transmits
the signal to the temperature control device. The output signal from the controller is sent to the positioner on the
cooling water (spraywater) control valve (SWCV). The positioner's output signal strokes the SWCV open, increasing
water pressure on the nozzles. Increasing water pressure upstream of the nozzles increases water flow through the
nozzles.
CAUTION
Pneumatic lines (where applicable) should be thoroughly blown clean with dry air before connection. Check to make sure
wiring connections are made per the equipment manufacturer's instructions and in accordance with local, regional, and
national codes.
10. If foreign debris has been introduced into the valve or upstream piping during installation, it must be removed prior
to using the valve for the first time. A Blowout or Blow‐through tool can be purchased to match the CVX valve and
facilitate piping blowdown without removal of the valve from the line. Contact your Emerson sales office for pricing
and availability of fixtures.
11. After cleanliness of the piping system has been assured, connect instrumentation and power supply to the CVX
valve actuator and associated equipment.
12. Monitor the CVX valve as the system is brought on line. Some visible vapors may be seen as the lubricants are
heated. If you see any steam leaks after startup, follow isolation and disassembly procedures and disassemble the
valve and replace the gaskets (key 43). If the packing box leaks, tighten hex nuts (key 68). If leakage continues,
replace the packing (key 64). Be sure to properly isolate the CVX valve prior to disassembly of valve or packing.
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however, the
packing might require some readjustment to meet specific service conditions. Check with your process or safety
engineer for any additional measures that must be taken to protect against process media.
Maintenance
It is recommended that diagnostic tests be performed on the valve 3-6 months prior to scheduled maintenance
shutdowns. Complete valve disassembly is recommended if tests performed on the valve indicate leakage, sticking or
substandard operation. If diagnostics indicate normal valve operation, complete disassembly and inspection of the
CVX is recommended during every other regularly scheduled outage or after 24-36 months, whichever comes first.
and replacement information.
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CVX Valve
February 2020
Instruction Manual
D103606X012
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:
DꢀDo not remove the actuator from the valve while the valve is still pressurized.
DꢀAlways wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
DꢀDisconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
DꢀUse bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
DꢀVent the power actuator loading pressure and relieve any actuator spring precompression.
DꢀUse lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
DꢀThe valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
DꢀCheck with your process or safety engineer for any additional measures that must be taken to protect against process
media.
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CVX Valve
February 2020
Instruction Manual
D103606X012
Table 2. Inspection Summary
Key
Part Description
Inspection Tips and Diagnostics
Repair
Replacement
Inspect for erosion, thermal fatigue, and other
damage.
Consult your local Emerson Service Center for a recommendation on
necessary weld repair or replacement if damage exists.
1
Valve Body
Inspect gasket surfaces for damage that could indicate
gasket leakage. Inspect packing box to ensure no
galling, scoring, or particulate is present.
If damage exists consult your local Emerson Service Center for a
recommendation on necessary weld repair or replacement.
6
Bonnet
Inspect gasket surfaces for damage that could indicate
gasket leakage when spray nozzles are replaced.
20
Nozzle Body Flange
Replacement Only
As needed
Consult your local Emerson Service
Center for a recommendation on
necessary repair or replacement if
damage exists.
Inspect cage bore for excessive wear, galling damage,
particulate damage, and flow passage damage or
clogging.
As needed for optimal
performance
21
Cage
Inspect for seat erosion, excessive wear, galling
damage, and particulate damage, paying close
attention to the seating and guiding surfaces.
Re-cutting/machining of seating
surfaces can be performed by your
local Emerson Service Center.
As needed for optimal
performance
22
23, 53
24
Plug
Stem and Stem Pin
Seat
Valve stem connection can be
repaired by your local Emerson
Service Center.
Inspect stem for dings, scoring, and galling. Inspect
valve stem connection for tightness.
As needed
Re-cutting/machining of seating
surfaces can be performed by your
local Emerson Service Center.
Inspect for seat erosion, particulate damage, galling,
As needed to maintain proper
shutoff
Repair can be performed by your
local Emerson Service Center.
25
30
37
Plug Retainer
Spray Nozzle
Nozzle Sleeve
All Gaskets
Inspect for excessive wear, galling, and other damage.
As needed
Replacement every 24-36 months
for optimal performance
Refer to Nozzle Maintenance Section.
Inspect for particulate or magnetite buildup when
spray nozzles are replaced.
Clean if necessary
Replacement Only
As needed
43, 47, 48,
75
Every valve disassembly requires replacement of
gaskets.
Every valve disassembly
Inspect for particulate buildup, scoring, and excessive
wear. Ensure piston ring is free to expand and contract
in the groove.
45
Piston Ring
Replacement Only
As needed
Inspect for excessive wear, galling, signs of leakage,
and other damage.
Every 36 months for optimal
performance
46
63
64
Bore Seal Ring
Packing Box Ring
Packing Set
Replacement Only
Replacement Only
Replacement Only
Inspect for scoring, galling, and other damage.
As needed
Every valve disassembly requires replacement of the
packing set.
Every valve disassembly
65
66
Packing Follower
Packing Flange
Inspect for scoring, galling, and other damage.
Inspect for scoring, galling, and other damage.
Replacement Only
Replacement Only
As needed
As needed
Inspect for thermal fatigue, erosion, particulate
damage, and flow passage damage or clogging.
77
Bolted Diffuser
Welded Diffuser
Clean if necessary
Clean if necessary
As needed
Inspect for thermal fatigue, erosion, particulate
damage, and flow passage damage or clogging.
Consult your local Emerson Service
Center if replacement is necessary.
N/A
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Instruction Manual
D103606X012
Servicing
Shut off water and steam flow and vent all system pressure before breaking any pressure boundaries.
WARNING
Residual system pressure may be released during the following steps if the system was improperly isolated or vented.
Use extreme care to prevent personal injury while loosening any fasteners in the pressure boundary.
Removal of Valve Bonnet and Trim
1. Disconnect all external connections to the positioner and actuator and remove the actuator from the valve. Consult
the actuator manufacturer's documentation for assistance in actuator removal.
2. Loosen and remove the hex nuts (key 68) along with the packing follower (key 65). If possible, remove packing set
(key 64) from the packing box.
3. Loosen bonnet stud nuts (key 55) using an even pattern to avoid uneven expansion of the gaskets. Remove the
entire bonnet assembly (key 6), pulling evenly in line with the valve stem (key 23) centerline. Uneven bonnet
removal can result in galling or bending of the valve stem. If difficulty is encountered in removing the bonnet, check
the bonnet for alignment and straighten the bonnet before making further attempts to remove it from the valve
body.
CAUTION
The bonnet must be handled with care while being removed from the body. Damage to the bonnet can result in gasket
leakage while the valve is in service.
Protect the bonnet by placing it on clean cloth or wood while the valve is disassembled.
4. Dislodge any remaining packing (key 64) from the packing box and discard. Remove the packing box ring (key 63)
from the bottom of the packing box. Inspect all parts: packing box, packing box ring (key 63), packing follower (key
65), valve stem (key 23), hex nuts (key 68) and studs (key 69) for signs of wear. Replace parts that are damaged or
show excessive wear.
5. Inspect the bonnet guiding surfaces and gasket mating surfaces. Light damage on the guiding surface may be
repaired with an emery cloth or other suitable material. Damage to the gasket mating surface may require bonnet
replacement to avoid leakage.
6. Remove the plug assembly (keys 22, 23, and 53) as a single unit by lifting the valve stem (key 23) with appropriate
rigging and lifting equipment and pulling the assembly from the body cavity. The plug assembly contains sensitive
guiding and sealing surfaces on its outside diameter and care must be taken in its handling. Protect the plug by
placing it on clean cloth or wood while the valve is disassembled.
7. Remove the cage (key 21) from the valve body. Remove and discard cage gaskets (key 43 and 44). Reference
surfaces on its inside and outside diameter and care must be taken during handling. Protect the cage by placing it
on clean cloth or wood while the valve is disassembled.
8. ANSI/FCI 70-2 Class V constructions only: Clean and inspect the guiding and sealing surfaces of the plug assembly.
Inspect the piston ring (key 45) and Bore Seal ring (key 46) for signs of excess wear or damage and replace if
necessary. The piston ring is a two-piece design with an outer seal ring and an inner expander ring. The outer ring
diameter should be expanded beyond the diameter of the plug in its free state. It can be shifted within its groove to
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inspect for uneven wear around its circumference. The piston ring should require some compression when
installing the plug into the cage. Lack of required compression indicates that the piston ring has worn or relaxed and
should be replaced. Vertical marks in the axial orientation also indicate wear that requires replacement of the ring.
The Bore Seal ring has a C-shaped cross section with the open portion of the C-shape facing the seat ring side of the
plug. Any uneven marks around the circumference of the ring or any flattening of the ring shape at its outside
diameter are indications of wear and require replacement. Contact your Emerson sales office for Bore Seal ring
replacement.
ANSI/FCI 70-2 Class IV constructions only: Clean and inspect the guiding and sealing surfaces of the plug assembly.
Inspect the two piston rings (key 45) for signs of excess wear or damage and replace if necessary. The piston ring is a
two piece design with an outer seal ring and an inner expander ring. The outer ring diameter should be expanded
beyond the diameter of the plug in its free state. It can be shifted within its groove to inspect for uneven wear
around its circumference. The piston ring should require some compression when installing the plug into the cage.
Lack of required compression indicates that the piston ring has worn or relaxed and should be replaced. Vertical
marks in the axial orientation also indicate wear that requires replacement of the ring.
9. Clean and inspect the cage bore for excessive wear. The entire length of the cage bore is either a sealing and/or
guiding surface and any measurable wear requires that the cage be replaced.
10. Welded seat rings remain retained inside the valve body. Clean and inspect the seating surface. Any detectable
damage around the circumference of the seating surface is an indication of wear and requires reconditioning to
ensure seating performance. Contact your Emerson sales office for specific instructions on reconditioning the
seating surface. If the CVX has a bolted seat ring, remove the cap screws (key 76) and discard the gasket (key 75)
that sits between the seat ring and diffuser (key 77) or valve body, depending on construction. Inspect cap screws
for damage and excessive wear; replace as necessary.
11. Removable (bolted/camped) diffuser constructions only. Remove the diffuser (key 77 or 24) and gasket (key 75)
that sits between the diffuser and valve body. Inspect the diffuser for thermal fatigue and flow passage damage or
clogging and clean if necessary. Diffuser replacement will be necessary if damage is present. The bolted diffuser
contains sensitive guiding surfaces on its outside diameter and care must be taken during handling. Protect the seat
diffuser by placing it on a clean cloth or wood while the valve is disassembled.
12. Welded diffuser constructions only. Inspect the diffuser for thermal fatigue and flow passage damage or clogging
and clean if necessary. If damage or clogging remains after cleaning, then diffuser replacement will be required;
contact your local Emerson Service Center for this process.
13. Remove all used gaskets and foreign material from the interior of the valve and from the inlet and outlet openings.
Remove any foreign material that may be in the valve body or trim. Inspect all valve body guiding and sealing
surfaces for any signs of wear.
14. If the valve has been in service, visually inspect the interior of the valve for abnormal wear, erosion, or thermal
fatigue. The gasket surfaces of the valve body and bonnet should be inspected to verify they are not damaged and
are free of imbedded gasket material. All scratches should be removed by grinding or filing to remove any
interference of the clearance zones between the internal bores and the mating parts. All signs of thermal fatigue
should be carefully evaluated to determine if repair or replacement is necessary. Your local Emerson Service Center
can help determine the severity of damage, if present, and recommend a course of action.
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Figure 3. Fisher AF Nozzle Cross Section
SPRAY HEAD
SWIRL CHAMBER
WATER INJECTION HOLES
(COMPOUND ANGLED ORIFICES)
SPRING
PLUG STEM
SPRAY PATTERN
SPRING CASING
PIN
SPRAY
ANNULUS
TRAVEL MEASUREMENT
A7191-2D
Nozzle Maintenance and Replacement
When subjected to normal operating conditions, it is possible that wear, blockage, and/or weld fatigue will occur to
the valve body or nozzle assembly. During regularly scheduled maintenance, visually inspect the nozzles for wear and
blockage. Your local Emerson Service Center can help to determine the extent of weld fatigue and the correct course
of action. Poor performing nozzles or nozzle failure is typically caused by wear, corrosion, erosion, and/or blockage.
The following instruction will help to determine if any of these problems are present and provide a recommended
course of action for each.
Note
For optimal performance, nozzles should be inspected every 18 to 24 months and replaced every 24 to 36 months.
1. OPTIONAL: Figure 3 shows the spray pattern that will need to be present during operation of the AF nozzles. Testing
can be performed by attaching the existing or an alternate, similar pressure, water line to the spray water input
connection. If this spray pattern is not present, replacement is recommended.
2. Loosen and remove the nozzle body flange stud nuts (key 58) and washers (key 59). Then, remove the nozzle body
flange (key 20). Inspect the nozzle body flange gasket surfaces for damage. If damage is present replacement is
necessary.
3. Remove the nozzle sleeve (key 37) with attached spray nozzle (key 30), nozzle sleeve gasket (key 47), and nozzle
body flange gasket (key 48). Inspect the nozzle sleeve for particulate or magnetite buildup and clean if necessary.
4. Inspect the spray annulus surface, the area between the plug stem and spray head, for excessive wear,
erosion/corrosion, or blockage due to particulate. Wear is defined as any nicks, cuts, or gouges on or immediately
around the spray annulus. Erosion/corrosion is defined as any form of rust or erosion of the metal on the plug stem
or spray head. Blockages are typically caused by small particulate trapped between the plug stem and spray head or
spring casing and spray head. Replacement of the nozzle is recommended if any of the preceding problems are
present.
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5. Grind off the tack welds holding the nozzle (key 30) in place. Apply a penetrant type thread lubricant and allow to
soak prior to unscrewing the nozzle. Using the provided flats on the side of the spray head, unscrew the nozzle from
the nozzle sleeve (key 37).
6. Grind excess tack weld material off both the nozzle (key 30) and nozzle sleeve (key 37).
7. In the absence of external forces, the nozzle must be fully closed. If the nozzle is not fully closed, it will need to be
replaced.
8. Inspect the water injection holes for reduced or non-circular shape due to erosion. Every hole must be the same size
and shape. If any are over-sized or non-circular in shape, the nozzle will need to be replaced.
9. Inspect the interior of the water injection holes for buildup of particulate or magnetite. Nozzle replacement will be
needed if any buildup is present.
Note
Complete disassembly of the nozzle is strongly discouraged, due to individual spare parts not being available.
10. OPTIONAL: To further check the nozzle for buildup of particulate or magnetite, the nozzle can be disassembled. If
disassembled, take great care not to damage the sharp edges of the spray annulus on the plug stem and the
sprayhead, as this will greatly affect the spray pattern. Do not compress a removed spring by hand or with a tool, as
compression beyond its normal operating range will damage the spring.
To disassemble the nozzle, first remove the pin using a small punch, and unscrew the spring casing from the plug
stem. The nozzle can be reassembled by following a reverse order of disassembly, taking care to line the hole in the
plug stem up with the hole in the spring casing, then pressing the pin back into place through the two parts.
11. The internal spring may relax over time and not provide the tensile force required to shut off and control flow. If the
nozzle spring is suspected of being too relaxed, then the nozzle should be replaced.
12. The travel can be determined by using a feeler gauge to measure the distance between the spray head near the
Table 3. AF Nozzle Specifications
NOZZLE TYPE
PLUG TRAVEL, INCHES
AF7
0.014
0.028
0.029
0.034
0.036
0.042
0.048
0.056
0.065
0.063
0.069
AF10
AF14
AF17
AF20
AF24
AF28
AF32
AF35
AF40
AF44
13. Inspect nozzle threads for damage and clean if needed. If damage is present, nozzle replacement will be necessary.
14. Rinse both the nozzle (key 30) and nozzle sleeve (key 37) to remove particulate.
15. Screw nozzle into the nozzle sleeve (key 37) and tighten just until the spray head is flat and tight against the nozzle
sleeve.
16. Tack-weld a small piece of welding wire onto the nozzle sleeve (key 37) next to either of the spray head flats to
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Figure 4. Spray Nozzle Tack Weld Location
AF NOZZLE BODY
GA26453
WIRE, TACK WELD ON BOTH ENDS
17. Reassemble in the following order: nozzle sleeve gasket (key 47), nozzle body flange gasket (key 48), spray
nozzle/sleeve assembly (key 30 and 37), nozzle body flange (key 20), washers (key 59), and stud nuts (key 58). It is
required to replace the nozzle sleeve gasket (key 47) and nozzle body flange gasket (key 48) with new gaskets each
time the nozzle body flange (key 20) is removed.
Note
Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
WARNING
Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or
assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the
serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design
or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification
mark visible. Contact your Emerson representative immediately if a discrepancy between actual parts and approved parts
is suspected.
18. Lubricate the nozzle body studs (key 57) and all surfaces the studs and nuts come into contact with. Tighten the
nozzle body flange nuts (key 58) in a uniform, multistage cross pattern. You may need to torque multiple times at
each torque to ensure that the nozzle body flange is torqued evenly. Required nozzle body flange bolting torque
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(1)
Table 4. Recommended Nozzle Body Flange Bolting Torque with Nickel Anti-Seize Lubricant
(2)
BOLT SIZE
Inch
5/8
RECOMMENDED BOLT TORQUE
THREADS PER INCH
LUBRICATION
NSm
163
LbfSft
11
10
9
120
3/4
258
190
275
385
525
695
935
1220
7/8
373
1
8
522
Nickel Anti-Seize
1‐1/8
1‐1/4
1‐3/8
1‐1/2
8
712
8
942
8
1268
1654
8
2. Torques for lubricated studs with heavy hex nuts.
Valve Assembly
1. Cleaning‐‐Make certain that all interior surfaces of the valve body and bonnet (including the packing box) are clean
and free of dirt, including the inlet and outlet openings. All surfaces of the valve interior that receive mating parts
should be given special attention when cleaning. All sliding fit surfaces should be coated with a copper‐based high
If the CVX has a removable seat ring, proceed with steps 2 through 4; otherwise proceed directly to step 5.
2. Place one gasket (key 75) into the valve body. If the CVX has a welded-in diffuser: Install the seat ring (key 24) onto
this gasket surface. If the CVX has a removable diffuser: install the diffuser (key 77 or 24) onto this gasket surface. If
trim is bolted, ensure the bolt holes in the diffuser are positioned with the bolt holes in the valve body. Then place
another gasket (key 75) onto the diameter of the diffuser, and install the seat ring onto this second gasket surface.
Clamped trim constructions will only have one gasket (key 75). Proceed to step 6 if using clamped trim.
Note
Horizontal actuator only: CVX valves positioned in the process pipeline with a horizontal actuator/trim may require special
attention to ensure that the spiral wound gaskets are maintained in the proper location during the valve assembly procedures
without falling out of the gasket groove. A gasket manufacturer recommends spray adhesive 3M #77 Super Spray Adhesive to
temporarily hold gaskets in place until they are fully contained by the CVX valve body and trim components. Please note special
spiral wound gasket-positioning techniques may be recommended. To use the adhesive, lightly spray the gasket groove that the
gasket will be installed in. Also lightly spray one side of the spiral wound gasket that will be contacting the previously coated
gasket groove. Let the spray adhesive set for one minute and then lightly press the spiral wound gasket into the gasket groove.
Other Considerations: Ensure the spiral wound gasket is located in the correct location when contact is made. Trying to remove
the gasket after contact will damage the gasket by pulling out or removing the soft filler/facing material. If the gasket is incorrectly
positioned after applying the spray adhesive it must be removed and discarded. The gasket groove will then need to be cleaned
and a new gasket will need to be installed.
3. Lubricate the seat ring cap screws (key 76) and all surfaces that contact the screws, including the valve body and
seat ring.
4. Torque the cap screws in a crisscross pattern, using no more than 1/4 of the specified torque as indicated in table 5.
Repeat the crisscross pattern, working up to the specified torque in 1/4 increments until the final torque is
achieved. Wait a minimum of one minute to allow for gasket/screw relaxation and recheck the torque, adjusting as
necessary.
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CVX Valve
February 2020
Instruction Manual
D103606X012
(1)
Table 5. CVX (Flow Up and Flow Down) Bolted Seat Ring Torque with Nickel Anti-Seize Lubricant
CAP SCREW SIZE
RECOMMENDED BOLT TORQUE
THREADS PER INCH
LUBRICATION
Inch
3/8
1/2
5/8
N•m
41
lbf•ft
30
16
13
11
91
67
Nickel Anti-Seize
163
120
Note
Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
WARNING
Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or
assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the
serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design
or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification
mark visible. Contact your Emerson Automation Solutions representative immediately if a discrepancy between actual
parts and approved parts is suspected.
5. Install one cage gasket (key 43) into the groove in the valve body. If the valve has a horizontal stem orientation,
ensure the gasket remains in the groove and does not get pinched during cage installation.
Note
Horizontal actuator only: Follow the note in Step 2 above to ensure the gasket are in the proper location during valve assembly.
6. Lubricate the inside of the cage as completely as possible. Insert the lubricated cage (key 21) into the valve body.
Ensure the lower cage diameter slides over the outside diameter of the seat ring. If there is any question regarding
the proper seating of the cage inside the valve body, the following measurements can be taken for confirmation.
For welded or bolted seat rings: Measure the thickness of the cage flange at its largest diameter. Measure the depth
of the mating counterbore where the cage flange engages into the valve body. When assembled with a new cage
gasket, the resulting depth from the top of the valve body to the top of the cage flange should be the difference in
these two measured valves, minus an additional 0.045 to allow for the uncompressed gasket.
If the CVX is an ANSI/FCI 70-2 Class V construction, proceed with steps 7-12; otherwise proceed directly to step 13 for
Class IV constructions.
7. The plug assembly includes a plug (key 22), stem (key 23), stem pin (key 53), retainer (key 25), piston ring (key 45)
and Bore Seal ring (key 46). Lubricate the plug assembly at all raised outside diameter surfaces and lubricate the
piston ring and Bore Seal ring.
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CVX Valve
February 2020
Instruction Manual
D103606X012
Figure 5. Fisher Bore Seal Construction
RETAINER
PISTON RING
CAGE
SEATING AREA
BORE SEAL
PLUG
FLOW-DOWN
9. Place the Bore Seal plug seal over the top of the valve plug. The retainer will help guide the Bore Seal down onto the
10. Apply a suitable high‐temperature lubricant to the threads on the plug. Then, place the Bore Seal retainer onto the
plug and tighten the retainer using an appropriate tool such as a strap wrench.
11. Using an appropriate tool such as a center punch, stake the threads on top of the plug in one place to secure the
Bore Seal retainer.
12. Install the lubricated plug assembly into the cage. The piston ring should require some radial compression to
collapse into the cage diameter. Do not use a metallic tool to create this piston ring compression as this could
damage the outer sealing diameter of the ring. The plug should slide into the cage smoothly with little effort until
the Bore Seal ring reaches its mating cage diameter. The extra load required to seat the Bore Seal trim seal will be
applied during actuator set up.
13. ANSI/FCI 70-2 Class IV constructions only: The plug assembly includes a plug (key 22), stem (key 23), and two
piston rings (key 45). Lubricate the plug assembly at all raised outside diameter surfaces and lubricate the piston
rings. Install the lubricated plug assembly into the cage. The piston ring should require some radial compression to
collapse into the cage diameter. Do not use a metallic tool to create this piston ring compression, as this could
damage the outer sealing diameter of the ring. The plug should slide into the cage smoothly with little effort. Refer
Figure 6. Retainer Guiding Fisher Bore Seal Onto the Plug
RETAINER
PISTON RING
BORE SEAL
PLUG
FLOW-DOWN
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CVX Valve
February 2020
Instruction Manual
D103606X012
14. Install the second cage gasket (key 43) over the cage boss where it will be self‐centering for the mating bonnet
groove. For clamped trims, install the bonnet gasket (key 44) in the body groove.
Note
Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
WARNING
Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or
assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the
serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design
or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification
mark visible. Contact your Emerson representative immediately if a discrepancy between actual parts and approved parts
is suspected.
15. Apply appropriate high‐temperature anti‐seize lubricant to the bonnet studs (key 54) and screw them into the valve
body. Back the studs out 1/2 to 1 turns after bottoming the stud in the valve body.
16. Lubricate the bonnet locating surfaces and carefully install the bonnet (key 6). Use care to avoid bending the stem.
17. Install bonnet stud washers (key 52) and nuts (key 55) and hand tighten.
18. Tighten the bonnet nuts (key 55) in a uniform, multistage cross pattern. Monitor the distance between the bonnet
and body and keep it even to ensure that the bonnet is being torqued evenly. It is recommended that torquing be
performed in a minimum of four torque levels until the final torque level is achieved. You may need to torque
multiple times at each torque level to ensure that the bonnet is torqued evenly. Required torque can be found in
body and bonnet is achieved around the entire circumference of the body-bonnet joint.
(1)
Table 6. Recommended Body/Bonnet Bolting Torque with Nickel Anti-Seize Lubricant
(2)
BOLT SIZE
RECOMMENDED BOLT TORQUE
THREADS PER INCH
LUBRICATION
Inch
NSm
522
LbfSft
1
8
8
8
8
8
8
8
8
8
8
385
525
1‐1/8
1‐1/4
1‐3/8
1‐1/2
1‐5/8
1‐3/4
1‐7/8
2
712
942
695
1268
1654
2129
2671
3308
4027
5776
935
1220
1570
1970
2440
2970
4260
Nickel Anti-Seize
2‐1/4
2. Torques for lubricated studs with heavy hex nuts.
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CVX Valve
February 2020
Instruction Manual
D103606X012
19. After the bonnet has been torqued to the required level, check the plug movement to ensure that the plug still
moves freely.
20. Recheck cleanliness of the packing box. Insert the packing box ring (key 63) over the stem and into the packing box.
Measure the depth of the packing box before and after ring insertion to be certain that it has traveled to the bottom
of the packing box. Insert packing rings (key 64), after lubricating with high temperature grease, into the packing
box and staggering the gaps on adjacent rings. The packing follower (key 65) can be used to ensure that each
packing ring is pushed down before installing the next packing ring.
21. After all packing rings are installed, thoroughly lubricate the studs (key 69) and insert the packing follower (key 65)
and the packing flange (key 66). Tighten the hex nuts (key 68) tight enough to block leakage but not so tight that
tighten the nuts to the maximum level, then loosen and retighten to the minimum torque level. After operating,
further tightening may be required to prevent leakage.
22. Install the actuator on the valve in accordance with manufacturer's standard procedure. If this is an ANSI/FCI 70-2
Class V construction, the plug assembly will require an additional load and travel to seat the Bore Seal ring (refer to
Table 7. Recommended Packing Nut Torque with Anti-Seize Lubricant
STEM DIAMETER
MAXIMUM TORQUE
MINIMUM TORQUE
ASME PRESSURE
RATING
Inch
NSm
LbfSft
NSm
LbfSft
CL300
CL600
CL900
CL1500
CL2500
49
67
36
49
61
75
90
33
45
56
68
82
24
33
41
50
60
1‐1/4
83
102
122
CL300
CL600
65
91
48
67
59
83
43
61
2
CL900
CL1500
CL2500
120
147
170
88
108
125
109
133
156
80
98
115
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CVX Valve
February 2020
Instruction Manual
D103606X012
Parts Ordering
Each CVX valve is assigned a serial number that can be found on the bonnet flange. Refer to the serial number when
contacting your Emerson sales office for technical assistance. When ordering replacement parts, refer to the serial
number and key numbers for each part required. The key numbers in the Parts List and the assembly drawing in figures
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should
not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the
performance of the valve, and could cause personal injury and property damage.
Key
Description
Parts List
37
Nozzle Sleeve
43*
44
Cage Gasket, (2 req'd)
Bonnet Gasket
45*
46*
47*
48*
52
Piston Ring
Note
Bore Seal Ring
Contact your Emerson sales office for Part Ordering information.
Nozzle Sleeve Gasket
Nozzle Body Flange Gasket
Bonnet Stud Washer
Stem Pin
Key
Description
53*
54
Bonnet Stud
1
Body
55
Bonnet Stud Nut
Nozzle Body Flange Stud
Nozzle Body Flange Stud Nut
Nozzle Body Flange Washer
Actuator Stud
6
Bonnet
57
20
Nozzle Body Flange
Control Cage
Control Plug
Stem
58
21*
22*
23*
24
59
60
61
Actuator Stud Nut
Packing Box Ring
Packing Set
Seat/Seat Diffuser
Plug Retainer
Spray Nozzle
63*
64*
65*
66*
68*
69*
75*
76*
77
25
30*
Packing Follower
Packing Flange
Hex Nut
Stud
Gasket
Seat Ring Cap Screws
Diffuser
*Recommended spare parts
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CVX Valve
February 2020
Instruction Manual
D103606X012
Neither Emerson, Emerson Automation Solutions, 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.
Fisher and Whisper Trim are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson
Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their
respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
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.
Emerson Automation Solutions
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore
E 2012, 2020 Fisher Controls International LLC. All rights reserved.
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