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Fisher CVX Instruction Manual

Steam conditioning valve
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Instruction Manual
D103606X012
Fisher
CVX Steam Conditioning Valve
™
Contents
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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
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.
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Figure 1. Fisher CVX Steam Conditioning Valve
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Emerson sales office
or Local Business Partner before
CVX Valve
June 2017

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Summary of Contents for Fisher CVX

  • Page 1: Table Of Contents

    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.
  • Page 2 Instruction Manual CVX Valve June 2017 D103606X012 Table 1. Specifications End Connection Sizes Bonnet Bolting SA193 Grade B7 Valve Inlet: NPS 4 through NPS 24 SA193 Grade B16 Valve Outlet: NPS 8 through NPS 36 N07718 Diffuser  Welded (permanent) End Connection Types...

  • Page 3: Educational Services

    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...

  • Page 4: Installation

    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.
  • Page 5 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.
  • Page 6 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.

  • Page 7: Maintenance

    (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.

  • Page 8: Servicing

    Instruction Manual CVX Valve June 2017 D103606X012 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.
  • Page 9 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.

  • Page 10: Nozzle Maintenance And Replacement

    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 SPRAY HEAD...
  • Page 11 Instruction Manual CVX Valve D103606X012 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.
  • Page 12 Instruction Manual CVX Valve June 2017 D103606X012 Table 3. AF Nozzle Specifications NOZZLE TYPE PLUG TRAVEL, INCHES 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.

  • Page 13: Valve Assembly

    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.
  • Page 14 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.
  • Page 15 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.
  • Page 16 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.
  • Page 17 Instruction Manual CVX Valve D103606X012 June 2017 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 table 6.
  • Page 18 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. Figure 7. Fisher CVX Class IV Construction CLASS IV SHUTOFF DOUBLE PISTON RING CONFIGURATION...
  • Page 19 Instruction Manual CVX Valve D103606X012 June 2017 Figure 8. Fisher CVX Class V Construction BORE SEAL TRIM CONFIGURATION CLOSED POSITION CVX PORT SIZE OPEN POSITION CAGE BORE AT PISTON RING PLUG DIAMETER AT BORE SEAL TRIM INSTALLATION CAGE BORE AT BORE SEAL RING SEAT...

  • Page 20: Parts Ordering

    D103606X012 June 2017 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 or Local Business Partner for technical assistance. When ordering replacement parts, refer to the serial number and key numbers for each part required.

  • Page 21: D103606X012 June

    Instruction Manual CVX Valve D103606X012 June 2017 Figure 9. Fisher CVX Assembly with Welded Seat Ring and Welded Diffuser...
  • Page 22 Instruction Manual CVX Valve June 2017 D103606X012 Figure 10. Fisher CVX Assembly with Bolted Seat Ring and Welded Diffuser...
  • Page 23 Instruction Manual CVX Valve D103606X012 June 2017 Figure 11. Fisher CVX Assembly with Bolted Seat Ring and Bolted Diffuser...
  • Page 24 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.

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