Instruction Manual
D103207X012
Fisher™ TBX Blowdown Fixture
TBX Blowdown Fixture
June 2017
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Educational Services 2.........................
Principle of Operation 2.........................
Maintenance 2.................................
Valve Disassembly 3...........................
Actuator Removal 3........................
Packing Box 3.............................
Bonnet and Trim 3.........................
Visual Inspection 5.........................
Installation of the Blowdown Plug 5..............
Piping Blowdown with the Blowdown Fixture
Installed 6.................................
Disassembly of the Blowdown Fixture 6...........
Cleaning 7................................
Reassembly 7.................................
Ordering Information 7..........................
Blowdown Fixture Design Conditions 7...........
Figure 1. Fisher TBX Constructions
STEAM
FLOW
TBX FLOW DOWN
TBX FLOW UP
STEAM FLOW
Introduction
Scope of Manual
This instruction manual includes installation and operation information for the Fisher TBX Blowdown Fixture for flow
up and flow down TBX valves. 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.
www.Fisher.com
TBX Blowdown Fixture
June 2017
Some instructions are different between the TBX flow up and TBX flow down valve constructions. Figure 1 can be used
to help identify which instructions apply. Inlet steam flow is perpendicular to the valve stem and actuator on a TBX
flow down and parallel to the valve stem and actuator on a TBX flow up.
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 TBX 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
proceeding.
or Local Business Partner before
Instruction Manual
D103207X012
Description
The TBX Blowdown Fixture provides a convenient way to clean piping upstream of the valve while taking care not to
damage internal valve parts.
Educational Services
For information on available courses for the Fisher TBX 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: education@emerson.com
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 TBX 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.
2
Instruction Manual
D103207X012
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.
TBX Blowdown Fixture
June 2017
Valve Disassembly
The following valve disassembly steps are intended as a quick reference only. Refer to the TBX instruction manual,
D103172X012
, 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.
3
TBX Blowdown Fixture
June 2017
Instruction Manual
D103207X012
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.
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 TBX 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
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. Flow up construction only: The seat ring remains retained inside the valve body. Clean and inspect the angled
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 or Local Business
Partner for specific instructions on reconditioning the seating surface.
10. Flow down construction only: The bolted seat ring and lower cage 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 TBX instruction manual (D103172X012
) for instructions on removing the bolted seat ring and lower
cage (key 79). Discard lower cage gaskets (key 75). The bolted seat ring and lower cage contain sensitive guiding
and gasket surfaces on its outside diameter and care must be taken in their handling. The seat ring and lower cage
should be temporarily stored on a clean wooden or cloth surface.
or Local Business Partner for
4
Loading...