Instruction Manual
D103628X012
Fisher
™
CVX Blowdown Fixture
CVX Blowdown Fixture
June 2017
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual
Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Educational Services
Principle of Operation
Maintenance
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
Actuator Removal . . . . . . . . . . . . . . . . . . . . . . . .
Packing Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bonnet and Trim . . . . . . . . . . . . . . . . . . . . . . . . .
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2
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3
3
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3
Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . .
Installation of the Blowdown Plug . . . . . . . . . . . . . .
Piping Blowdown with the Blowdown Fixture
Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly of the Blowdown Fixture . . . . . . . . . . .
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . .
Blowdown Fixture Design Conditions . . . . . . . . . . .
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5
6
7
7
5
6
6
Introduction
Scope of Manual
This instruction manual includes installation and operation information for the Fisher CVX Blowdown Fixture. Piping blowdown is very important to successful plant startup and trouble free operation. The plan for piping blowdown should be undertaken by professionals familiar with all aspects of blowdown operation. This manual is not intended to cover all details required for successful piping system cleaning.
The CVX Blowdown Fixture is only available for constructions including replaceable diffusers.
Key numbers identified for valve disassembly are shown in the specific valve instruction manual. Refer to separate instruction manuals for instructions covering the exact valve, actuator, and accessories associated with the blowdown fixture.
Do not install, operate, or maintain a CVX Blowdown Fixture 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 Blowdown Fixture provides a convenient way to clean piping upstream of the valve while taking care not to damage internal valve parts.
www.Fisher.com
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CVX Blowdown Fixture
June 2017
Instruction Manual
D103628X012
Educational Services
For information on available courses for the Fisher CVX Blowdown Fixture, 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 Blowdown Fixture replaces the valve plug and cage and allows steam flow from the upstream piping to be directed through the valve body and out the valve outlet and downstream piping.
Maintenance
WARNING
To avoid personal injury or property damage from release of pressurized process media, ensure that the system is completely depressurized and appropriate safety measures have been taken prior to carrying out any of the following maintenance procedures. Only trained competent individuals with the proper equipment should attempt to disassemble and install a Blowdown Fixture, and reassemble a CVX valve.
D Do not remove the actuator from the desuperheater 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 on 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.
Instruction Manual
D103628X012
CVX Blowdown Fixture
June 2017
Valve Disassembly
The following valve disassembly steps are intended as a quick reference only. Refer to the CVX instruction manual,
D103606X012, for key numbers and further detail regarding valve disassembly.
Actuator Removal
The following actuator disassembly steps are intended as a quick reference only. Refer to the appropriate actuator instruction manual for further detail on actuator removal.
1. Release the actuator seat load by either manually stroking the valve or applying the appropriate instrument signal.
The stem connector may be removed once the plug is off of the valve seat.
2. If an instrument signal has been used to stroke the plug off the seat, remove the signal only after removing the stem connector.
3. Isolate and disconnect the operating lines from the actuator.
4. Loosen the yoke fasteners and remove the actuator from the valve.
Packing Box
Unbolt the packing stud nuts, (key 68), and remove the packing flange (key 66) and packing follower, (key 65)
(reference the appropriate instruction manual for key numbers). Remove as much packing as possible from the packing box.
CAUTION
Extreme care should be taken to avoid scratching the stem or the packing box.
Bonnet and Trim
1. Loosen the bonnet stud nuts, (key 55) using an even and opposing pattern (for example, if the first nut loosened is at the 1 o'clock position, the next nut to be loosened would be at the 7 o'clock position). This will prevent uneven loading of the bonnet studs, which may cause binding.
Individual nuts should not be completely loosened while the remaining nuts are tight. It is suggested that at least two stages of loosening be used to avoid overloading the last few remaining studs.
2. Remove the bonnet (key 6) from the valve with uni‐axial pull. If the bonnet seems to bind in the valve body, check the alignment of the hoist or pulling mechanism. Deviation from an axial pull of the parts may result in galling or bending of the stem (key 23). The bonnet may be lightly tapped back into alignment with a soft face mallet. The stem and plug should be pushed back into the valve body while the bonnet is being removed. Once the bonnet is removed, dislodge any remaining packing rings from the packing box.
CAUTION
Do not attempt to overpower any binding, as damage to the guide surfaces may result.
3. Remove the packing ring (key 63) from the bottom of the packing box. Lightly sand the inside of the packing box with 60 or 80 grit paper to remove any adherent packing material. Final cleanup should be made with 160 grit or finer paper.
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CVX Blowdown Fixture
June 2017
Instruction Manual
D103628X012
4. 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.
5. Remove the plug assembly (key 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. The plug should be temporarily stored on a clean wooden or cloth surface.
6. Remove the cage (key 21) from the valve body. Remove and discard the upper and lower cage gaskets (key 43).
Reference the CVX valve instruction manual for guidance in performing this disassembly. The cage contains sensitive guiding surfaces on its outside diameter and care must be taken during handling. The cage should be temporarily stored on a clean wooden or cloth surface.
7. Clean and inspect the guiding and sealing surfaces of the plug assembly. For balanced plug designs, 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 indicates 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 stem side of the plug for flow‐up designs and the open portion of the Cshape facing the seating surface of the plug for flowdown designs.
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 or Local Business Partner for
Bore Seal ring replacement.
8. Clean and inspect the inside diameter surfaces of the cage. The entire length of the cage inside diameter is either a sealing and/or guiding surface and any measurable wear requires that the cage be replaced.
9. Bolted Seat Ring Removable Diffuser Only: The bolted seat ring and seat diffuser must be removed. Loosen the seat ring bolts, (key 76) using an even and opposing pattern (for example, if the first nut loosened is at the 1 o'clock position, the next nut to be loosened would be at the 7 o'clock position). This will prevent uneven loading of the seat ring studs, which may cause binding. Individual bolts should not be completely loosened while the remaining bolts are tight. It is suggested that at least two stages of loosening be used to avoid overloading the last few remaining studs. Reference the CVX instruction manual for guiding on removing the bolted seat ring and seat diffuser (key 77). Discard lower diffuser gaskets (key 75). The bolted seat ring and seat diffuser contain sensitive guiding and gasket surfaces on its outside diameter and care must be taken in their handling. The seat ring and seat diffuser should be temporarily stored on a clean wooden or cloth surface.
10. Remove all used gaskets and foreign matter from the interior of the valve and from the inlet and outlet openings.
Remove any foreign matter that may be in the valve trim. Inspect all valve body guiding and sealing surfaces for any signs of wear.
Visual Inspection
Visually inspect the interior of the valve for abnormal wear, signs of erosion, or scoring if the valve has been in service.
All scores and scratches should be removed by grinding or filing to remove any interference of the clearance zones between the internal bores and the mating parts. The affected area should be sanded with 100 grit or finer paper. Do not attempt to completely remove the score, only the interference should be removed and sanded.
The gasket surfaces of the valve body and bonnet should be inspected to verify that they are not damaged and are free of imbedded gasket material.
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Instruction Manual
D103628X012
CVX Blowdown Fixture
June 2017
Installation of the Blowdown Plug
Inspect the valve to ensure that all parts and gaskets have been removed and the valve body is free from foreign debris. Lubricate the lower body bore where the bolted seat and seat diffuser guide are located and the upper valve
body bore and counterbore. Install the trim as noted below and illustrated in the Blowdown Fixture drawings, figure 1.
1. Place the lower cage gasket (key 43) into the valve body.
2. Insert the Blowdown Plug (key 3) into the valve body, making sure that the gasket remains properly placed.
Table 1. Recommended Bonnet Stud Torque (1)
Bolt Size, Inch
1
1‐1/8
1‐1/4
1‐3/8
1‐1/2
1‐5/8
1‐3/4
1‐7/8
2
2‐1/4
1. Torque values for lubricated threads.
2. Torques for studs with heavy hex nuts.
Threads Per Inch
8
8
8
8
8
8
8
8
8
8
Recommended Bolt Torque, lbf S ft (2)
405
550
730
980
1290
1650
2070
2560
3130
4490
3. Place the upper cage gasket (key 43) on top of the flange of the Blowdown Plug.
4. Lubricate the bonnet studs (key 54) and lower the bonnet (key 6) onto the valve body, making sure that the upper cage gasket remains in the gasket containment groove.
5. Lubricate and tighten the bonnet fasteners as recommended in the TBX valve instruction manual. Torque values are
also shown in table 1 of this document.
CAUTION
Failure to comply with good body‐to‐bonnet bolting practices and the torque values shown in table 1 or in the appropriate
valve instruction manual may result in damage to the valve.
Piping Blowdown with the Blowdown Fixture Installed
WARNING
To avoid personal injury or property damage from blown out debris, take appropriate measures to stay clear of the outlet of the blowdown piping during the following procedure.
Note
The following steps are not intended to be complete instructions for performing a proper system blowdown. They are intended only to address the basic issues required for proper piping blowdown.
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CVX Blowdown Fixture
June 2017
Instruction Manual
D103628X012
1. Perform piping blowdown according to plant startup procedures. Normal blowdown procedures should incorporate piping velocities in excess of those anticipated during maximum system operation. Piping should be blown down until two subsequent checks of a target placed at the outlet of the blowdown piping indicate that all debris has been removed from the piping.
2. At the completion of the blowdown procedure, secure and depressurize the system.
Disassembly of the Blowdown Fixture
1. Loosen the bonnet nuts, (key 55) using an even and opposing pattern (for example, if the first nut loosened is at the
1 o'clock position, the next nut to be loosened would be at the 7 o'clock position). This will prevent uneven loading of the bonnet flange studs which may cause binding.
Individual nuts should not be completely loosened while the remaining nuts are tight. It is suggested that at least two stages of loosening be used to avoid overloading the last few remaining studs.
2. Remove the bonnet (key 6) from the valve with uni‐axial pull. If the bonnet seems to bind in the valve body, check the alignment of the hoist or pulling mechanism. Deviation from an axial pull of the parts may result in galling or bending of the stem.
CAUTION
Do not attempt to over‐power any binding, as damage to the guide surfaces may result.
3. Remove and discard the upper cage gasket (key 43).
4. Remove the Blowdown Plug (key 3) from the valve body cavity using the integral eyebolt holes in the blowdown plug.
5. Remove and discard the lower cage gasket (key 43).
CAUTION
To avoid compromising the service life of the TBX valve body and/or trim, do not reuse the Blowdown Fixture gaskets for valve reassembly.
Cleaning
After removal of the Blowdown Plug, the interior of the valve body should be rinsed with clean water or repeatedly wiped with clean towels until the surfaces are clean to the touch. All internal parts should be cleaned prior to reassembly.
Reassembly
Refer to the CVX valve instruction manual for guidance in reassembling the valve.
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Instruction Manual
D103628X012
CVX Blowdown Fixture
June 2017
Ordering Information
Information required to order a CVX Blowdown Fixture.
D Valve Serial Number
D Valve Tag Number
D Customer Order Number
D Valve Model Number
Blowdown Fixture Design Conditions
D Flushing Fluid
D Flushing Fluid Pressure
D Flushing Fluid Temperature
D Material (carbon steel unless otherwise specified)
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.
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CVX Blowdown Fixture
June 2017
Figure 1. Fisher CVX Removable Diffuser Blowdown Fixture
BONNET STUDS/
NUTS/WASHERS
(KEYS 54, 55, 52)
BONNET
(KEY 6)
UPPER CAGE GASKET
(KEY 43)
LOWER CAGE GASKET
(KEY 43)
Instruction Manual
BLOWDOWN
PLUG
KEY 3
D103628X012
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 is a mark 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 www.Fisher.com
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2012, 2017 Fisher Controls International LLC. All rights reserved.
