Fisher Cvx User manual

www.Fisher.com

Fisher™CVX Steam Conditioning Valve

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Educational Services 3.........................

Principle of Operation 3.........................

Installation 4..................................

Maintenance 7.................................

Servicing 8...................................

Removal of Valve Bonnet and Trim 8.............

Nozzle Maintenance and Replacement 10.........

Valve Assembly 13............................

Parts Ordering 20...............................

Parts List 20...................................

Figure 1. Fisher CVX Steam Conditioning Valve

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 or Local Business Partner before

proceeding.

Description

The CVX Steam Conditioning Valve (see figure 1) provides a convenient and efficient way to reduce steam pressure

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.

Instruction Manual

D103606X012

CVX Valve

June 2017

Instruction Manual

D103606X012

CVX Valve

June 2017

Table 1. Specifications

End Connection Sizes(1)

Valve Inlet: NPS 4 through NPS 24

Valve Outlet: NPS 8 through NPS 36

End Connection Types

JASME Buttweld (all sizes)

JASME Raised Face Flanges (all sizes)

Valve Configuration

Angle Pattern (flow down)

Valve Body Ratings(2)

ASME: CL150 - CL2500

Bonnet Type

Bolted

Shutoff Classifications per ANSI/FCI 70‐2 and IEC

60534‐4

Class V: Standard

Class IV: Optional

Flow Characteristics(3)

Linear

Diffusers

Welded (permanent): Standard

Bolted (removable): Optional

Construction Materials

Body/Bonnet

JSA105 Carbon Steel

JSA182 Grade F22 (21/4 Cr1 Mo)

JSA182 Grade F91 (9 Cr1 MoV)

Bonnet Bolting

JSA193 Grade B7

JSA193 Grade B16

JN07718

Diffuser

Welded (permanent)

JSA106 Grade B Carbon Steel

JSA335 Grade P22 (21/4 Cr1 Mo)

JSA335 Grade P91 (9 Cr1 MoV)

Bolted (removable)

JSA182 Grade F22 (21/4 Cr1 Mo) with N07718

Bolting

Seat Ring

Welded Seat Ring

JSA105 Carbon Steel with Alloy 6

JSA182 Grade F22 (21/4 Cr1 Mo) with Alloy 6

JSA182 Grade F91 (9 Cr1 MoV) with Alloy 6

Bolted Seat Ring

JSA182 Grade F22 (21/4 Cr1 Mo) with N07718

Bolting

JN06625 with N07718 Bolting

Control Plug:

JSA182 Grade F22 (21/4 Cr1 Mo) with Alloy 6

Guiding Surfaces

JSA182 Grade F91 (9 Cr1 MoV) with Alloy 6

Guiding Surfaces

Stem

JSA479 Type S20910

JN07718

Control Cage:

JSA182 Grade F22 (21/4 Cr1 Mo) Nitrided

JSA182 Grade F91 (9 Cr1 MoV) Nitrided

Piston Rings

JAlloy 6 with N07750 Expander

Bore Seal

JN07718

Gaskets

JBonnet: N07750/Graphite

JAll Others: N06600/Graphite

Packing

JGraphite/Flexible Graphite

Nozzles

JS41000 SST

1. Standard end connection sizes. Alternate inlet and outlet sizes available for each valve body size to match piping requirements.

2. Not all valve sizes are available in all valve body ratings.

3. Contact your Emerson sales office or Local Business Partner for other flow characteristics.

Instruction Manual

D103606X012

CVX Valve

June 2017

The CVX Steam Conditioning Valve (figure 1) is designed to handle moderate to severe applications in today's cycling

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

The positioning of the valve plug within the control cage controls the steam flow (see figure 1). The control cage has

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.

Instruction Manual

D103606X012

CVX Valve

June 2017

Figure 2. Typical Fisher CVX Installation

E1463

STEAM FISHER CVX

STEAMFLOW

SPRAYWATER

FISHER 667‐EZ

SPRAYWATER

CONTROL VALVE

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.

Instruction Manual

D103606X012

CVX Valve

June 2017

If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this

instruction manual.

CAUTION

This valve is intended for a specific range of service conditions (see table 1). Applying different conditions to the valve could

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. Personal injury or damage to equipment could occur if

the valve is improperly lifted into place.

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.

3. Arrange a lifting sling 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—Grease 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.

Instruction Manual

D103606X012

CVX Valve

June 2017

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 100 mesh strainer should be installed in the water line as close to the CVX valve as possible. 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.

An example of a typical installation appears in figure 2. Consult the CVX cooler sizing sheet for the required distance

of straight pipe. This is unique for each application and is supplied by Emerson.

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 or Local Business Partner.

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 electronic

lines for correct connection.

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 or Local

Business Partner 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

Instruction Manual

D103606X012

CVX Valve

June 2017

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.

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.

Table 2 identifies the recommended inspection tips and diagnostics that can be performed with corresponding repair

and replacement information.

Table 2. Inspection Summary

Key Part Description Inspection Tips and Diagnostics Repair Replacement

1Valve Body 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.

6 Bonnet

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.

20 Nozzle Body Flange Inspect gasket surfaces for damage that could indicate

gasket leakage when spray nozzles are replaced. Replacement Only As needed

21 Cage

Inspect cage bore for excessive wear, galling damage,

particulate damage, and flow passage damage or

clogging.

Consult your local Emerson Service

Center for a recommendation on

necessary repair or replacement if

damage exists.

As needed for optimal

performance

22 Plug

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

23, 53 Stem and Stem Pin Inspect stem for dings, scoring, and galling. Inspect

valve stem connection for tightness.

Valve stem connection can be

repaired by your local Emerson

Service Center.

As needed

24 Seat Inspect for seat erosion, particulate damage, galling,

and proper bolt torque (if applicable, refer to table 5).

Re-cutting/machining of seating

surfaces can be performed by your

local Emerson Service Center.

As needed to maintain proper

shutoff

25 Plug Retainer Inspect for excessive wear, galling, and other damage. Repair can be performed by your

local Emerson Service Center. As needed

30 Spray Nozzle Refer to Nozzle Maintenance Section. Replacement every 24-36 months

for optimal performance

37 Nozzle Sleeve Inspect for particulate or magnetite buildup when

spray nozzles are replaced. Clean if necessary As needed

43, 47, 48,

75 All Gaskets Every valve disassembly requires replacement of

gaskets. Replacement Only Every valve disassembly

45 Piston Ring

Inspect for particulate buildup, scoring, and excessive

wear. Ensure piston ring is free to expand and contract

in the groove.

Replacement Only As needed

46 Bore Seal Ring Inspect for excessive wear, galling, signs of leakage,

and other damage. Replacement Only Every 36 months for optimal

performance

63 Packing Box Ring Inspect for scoring, galling, and other damage. Replacement Only As needed

64 Packing Set Every valve disassembly requires replacement of the

packing set. Replacement Only Every valve disassembly

65 Packing Follower Inspect for scoring, galling, and other damage. Replacement Only As needed

66 Packing Flange Inspect for scoring, galling, and other damage. Replacement Only As needed

77 Bolted Diffuser Inspect for thermal fatigue, erosion, particulate

damage, and flow passage damage or clogging. Clean if necessary As needed

N/A Welded Diffuser Inspect for thermal fatigue, erosion, particulate

damage, and flow passage damage or clogging. Clean if necessary Consult your local Emerson Service

Center if replacement is necessary.

Instruction Manual

D103606X012

CVX Valve

June 2017

Servicing

WARNING

Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing

any maintenance operations:

D Do not remove the actuator from the valve while the valve is still pressurized.

D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal

injury.

D Disconnect 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.

D Use 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.

D Vent the power actuator loading pressure and relieve any actuator spring precompression.

D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.

D The 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.

D Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

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.

Instruction Manual

D103606X012

CVX Valve

June 2017

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 grasping the valve stem (key 23) 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 two (2) cage gaskets (key 43). Reference

figures 9, 10, and 11 for guidance in performing this disassembly. The cage contains sensitive guiding 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

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 Automation Solutions 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 Automation Solutions 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. Bolted diffuser constructions only. Remove the diffuser (key 77) 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

Instruction Manual

D103606X012

CVX Valve

June 2017

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.

Figure 3. Fisher AF Nozzle Cross Section

A7191-2D

SPRAY HEAD

SWIRL CHAMBER

WATER INJECTION HOLES

(COMPOUND ANGLED ORIFICES)

SPRING

PLUG STEM

SPRING CASING

TRAVEL MEASUREMENT

SPRAY

ANNULUS

SPRAY PATTERN

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24 months and replaced every 2436 months.

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D103606X012

CVX Valve

June 2017

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.

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 drill bit as a 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

water injection ports to the side of the spring casing, as outlined in figure 3. This measurement must match the

factory set plug stem travel for the corresponding nozzle type as shown in table 3.

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D103606X012

CVX Valve

June 2017

Table 3. AF Nozzle Specifications

NOZZLE TYPE PLUG TRAVEL, INCHES

AF7 0.014

AF10 0.028

AF14 0.029

AF17 0.034

AF20 0.036

AF24 0.042

AF28 0.048

AF32 0.056

AF35 0.065

AF40 0.063

AF44 0.069

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

prevent rotation during service; refer to figure 4. Maintain low heat to prevent distortion of the nozzle.

Figure 4. Spray Nozzle Tack Weld Location

AF NOZZLE BODY

WIRE, TACK WELD ON BOTH ENDS

GA26453

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.

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 stud torque can

be found in table 4.

Instruction Manual

D103606X012

CVX Valve

June 2017

Table 4. Recommended Nozzle Body Flange Bolting Torque with Nickel Never-Seez Lubricant

BOLT SIZE THREADS PER INCH LUBRICATION RECOMMENDED BOLT TORQUE(1)

Inch NSm LbfSft

5/8 11

Nickel Never-Seez

163 120

3/4 10 258 190

7/8 9 373 275

1 8 522 385

1‐1/8 8 712 525

1‐1/4 8 942 695

1‐3/8 8 1268 935

1‐1/2 8 1654 1220

1. Torques for lubricated studs with heavy hex nuts.

WARNING

Different lubricants can produce different required torque values. Failure to calculate correct torque values for different

lubricants than recommended can lead to personal injury and equipment damage.

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.

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

temperature anti‐seize lubricant prior to reassembly. Refer to figures 9, 10, and 11 for reference.

If the CVX has a bolted 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 bolted-in diffuser: install the diffuser (key 77) onto this gasket surface ensuring

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.

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

Instruction Manual

D103606X012

CVX Valve

June 2017

without falling out of the gasket groove. Gasket manufacturer Flexitallic 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. It should

be noted that spiral wound gasket manufacturers other than Flexitallic may recommend different special gasket positioning

techniques. To use the adhesive with Flexitallic gaskets, 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.

Table 5. CVX (Flow Up and Flow Down) Bolted Seat Ring Torque with Nickel Never-Seez Lubricant

CAP SCREW SIZE THREADS PER INCH LUBRICATION RECOMMENDED BOLT TORQUE

Inch N•m lbf•ft

3/8 16

Nickel Never-Seez

41 30

1/2 13 91 67

5/8 11 163 120

WARNING

Different lubricants can produce different required torque values. Failure to calculate correct torque values for different

lubricants than recommended can lead to personal injury and equipment damage.

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: 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