Dyna-Flo 390 Parts list manual

Model 390, 391, 392 Control Valves
Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
P-390M0620A 1
Operation, Parts, and Instruction Manual
TABLE OF CONTENTS
General 2 Assembly 13
Scope 2 Stud Installation 13
Specifications 3 Plug Seal Assembly 13
Unpacking 4 Trim Parts Assembly 16
Installation 4 Bonnet Installation 16
Air Piping 5Packing Installation 19
Periodic Inspection 6Globe Valve Cross Section 23
Actuator Removal 6 Angle Valve Cross Section 24
Maintenance 7 Body to Bonnet Stud Torque - Table 2 26
Packing Maintenance 7 Packing Nut Torque - Table 3 26
Disassembly 8 Valve Stem Connection Information - Table 4 26
Packing Removal 8 Parts 27
Bonnet Removal 8 392 Model Builder 43
Trim Parts Removal 9 390 & 391 Model Builder 44
Plug Seal Removal 10
Packing Parts Removal 11
Lapping 12
Figure 1 390 Control
Valve & DFC Actuator

Dyna-Flo Control Valve Services Ltd.
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Model 390, 391, 392 Control Valves
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Operation, Parts, and Instruction Manual
NOTICE These instructions are meant to be used with the Dyna-Flo 390 Technical Bulletin as they refer to Figures
and Tables therein. If you do not have the Technical Bulletin, contact Dyna-Flo immediately, or visit
www.dynaflo.com
Each control valve is factory checked. Check the calibration for the specific application, before a valve
is put into service.
It is the intention of this document to provide users with an accurate guide for safe installation and
maintenance of the 390 Control Valves. Revisions and updates are available at above mentioned website.
GENERAL
The following instructions are to be thoroughly reviewed and understood prior to installing, operating or performing
maintenance on this equipment. Work on this equipment should be performed by experienced personnel. Throughout
the manual, safety and caution notes appear and must be strictly followed, to prevent serious injury or equipment
malfunction.
SCOPE
The control valve configuration and construction materials were selected to meet particular pressure, temperature, and process
conditions. Some material combinations are limited in their pressure and temperature ranges. Do not apply any other conditions to
the valve without first contacting your Dyna-Flo sales office.
This manual is written to be a practical and useful guide to maintaining the Dyna-Flo 390 Control Valve.
SAFETY CAUTION
Only well trained experienced technicians should perform these procedures. Use safe work practices and lock out
procedures when isolating valves and actuators. It is also important to wear the proper protective equipment when
performing any installation or maintenance activity. Use only parts and materials rated for the process being used,
operating conditions, and environmental conditions products will be used in.
To avoid personal injury or installation damage as a result of the sudden release of process pressure or damage to
equipment, do not install the valve assembly where service conditions could exceed the limits stated in this manual,
sales bulletin or on the equipment nameplates. Use government codes, accepted industry standards and good piping
practices, and select proper pressure-relieving equipment for protection of your installation. Always be aware of
flammable process and instrument gas.
Always be aware of the hazards of actuators, especially spring-loaded actuators. Be sure that the actuator is
de-energized or in the failed position before performing any maintenance procedure.
These valves have dangerous pinch points. Never put your hands inside the valve unless you are certain that the plug
and stem will not move.

Model 390, 391, 392 Control Valves
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Operation, Parts, and Instruction Manual
SPECIFICATIONS
Configurations
The Model 390 control valve is a high capacity single port,
globe style valve with a bolted type bonnet. The standard
valve plug action is push down to close. Refer to Table 1 of
the Sales Bulletin.
Consult your Dyna-Flo sales office for other available
configurations.
Sizes and Connection Styles
(Refer to Table 1 of Sales Bulletin)
Model: 390 & 391
Size: 2”, 3”, 4”, 6”
Body: Globe (All Sizes), Angle (2” to 6”)
Rating: ASME Class 900 & 1500
Connection: RF / RTJ / BWE - All Sizes
Maximum Inlet Pressures and Temperatures
Flanged valves consistent with ASME Class 900 and 1500
rating as per ASME B16.34, unless limited.
Maximum Pressure Drops
Standard Valve Trim: Refer to Figures 33 to 36.
Anti-Cavitation 2 Stage Trim: 2,160 Psi (14,893 kPa).
Anti-Cavitation 3 Stage Trim: 3,000 Psi (20,684 kPa).
Low-Noise Valve Trim: Figure 35.
Characteristic and Flow Direction
•Equal Percentage (Standard) - Flow Down
•Modified Equal Percentage - Flow Down
•Linear - Flow Down
•Low-Noise III (Linear) - Flow Up
•Anti-Cavitation 1-Stage (Linear) - Flow Down
•Anti-Cavitation 2-Stage (Linear) - Flow Down
Dimensions
Valve and Actuator Outline Dimension Diagram
Refer to Figure 2 of the Sales Bulletin.
Valve and Actuator Assembly Dimensions
Refer to Tables 6 to 11 of the Sales Bulletin.
Approximate Valve Body and Actuator Weights
Refer to Table 1.
Materials
Body and bonnet material options include:
LCC (A350-LF2 optional* bonnet material)
WCC (A350-LF2 optional* bonnet material)
WC9 (A182-F22 optional* bonnet material)
CF8M (A182-F316 optional* bonnet material)
*NOTE: Dyna-Flo reserves the right to substitute a cast
material with the forged bar equivalent in the event a casting
is not available.
Refer to Figure 9 of the Sales Bulletin for valve construction
material temperature limitations. Refer to Table 14 of the
Sales Bulletin for trim selections.
Cross-Section of the Model 390 Control Valves
Refer to Figure 31.
Port Diameters and Maximum Valve Plug Travel
Refer to Tables 3 and 4 of the Sales Bulletin.
Packing Type and Examples
The Standard packing is PTFE V-ring. Live-loaded low
emission, graphite, KALREZ®and other packing
arrangements are available. Refer to Figures 28 to 30.
Maximum Valve Sizing Coefficients
For standard coefficients at maximum travel, refer to Table 18
& 19 of the Sales Bulletin. For full list of coefficients refer to
document P-CVSM.
Service Application
Refer to Tables 12 - 17 of the Sales Bulletin.
For more information and other options contact your Dyna-Flo
sales office.

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Model 390, 391, 392 Control Valves
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Operation, Parts, and Instruction Manual
UNPACKING VALVE FROM SHIPPING
CONTAINER
Special Tools Required:
• Properly Rated Lifting Straps (2 – 4 Straps) See Table 1 for
valve weights.
• Lifting Hooks and Chains (for valve actuators with lifting
hooks attached)
• Lifting Device (Example: Crane)
Check the packing list, verify that the list includes all the
materials in the shipping container before unpacking. Valve
information can be found on the nameplate (Key 33). Refer to
Figure 2 and 31 for possible nameplate locations.
When lifting the valve from shipping container, place properly
rated lifting straps securely around the neck of the actuator,
refer to Figure 2 for strap placement. Straps should be placed
to avoid damage to tubing and other mounted accessories.
For valve assemblies without an attached actuator, use caution
when lifting or positioning straps so as not to damage the valve
stem.
Lift the valve/actuator assembly using proper lifting techniques.
INSTALLATION
Before You Begin:
• Read the General and Scope section of this manual (Page 2).
• Read Safety Caution (Page 2).
• Sudden movement of actuator can cause damage or injury.
It helps to have the actuator de-energized.
• Use safe work practices and lock out procedures before
placing valve in-line.
NOTE: For buttweld valve bodies, depending on the body
material, post-weld heat treatment might be required. Soft
parts, seals, some metal trim, threading and shrink-fit parts
can be damaged by post-weld heat treatment. If post-weld heat
treatment is required, it is recommended that all internal valve
parts be removed from the valve body. Contact Dyna-Flo for
more information.
Parts Required:
• Appropriate Line Flange Nuts and Bolts
• Appropriate Line Flange Gaskets
• If the valve has small internal flow passages such as
Anti-Cavitation or Low-Noise trim, the installation of an
upstream strainer should be considered to prevent clogging
of these small passages.
Figure 2 Actuator Lifting Suggestions
Installation Steps:
1Check the packing box bolting (Key 25) for proper
tightness. Refer to Packing Installation on Pages 18 & 20
for proper packing tightening instructions.
2The valve assembly may be installed in any position
unless limited by vibration considerations, it is however
recommended that the valve be installed with the valve
stem (Key 5) perpendicular to the ground. NOTE: For
some non-vertical orientations, the valve actuator may
need to be supported.
3 Install the valve with flow through the valve in the
direction shown by the flow arrow on the valve body.
4Install the appropriate line flange gaskets.
5Apply anti-seize compound to the threads of the flange
studs and install.
6When possible, before tightening the line bolting, stroke
the valve and check for smooth operation through the full
stroke. Unsteady valve stem movement could be an
indication of an internal problem.
7Tighten the line flange bolting in even increments in a
crisscross pattern until the correct line bolt torque
specification is reached.
LIFTING STRAP
33

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INSTALLATION (Continued)
AIR PIPING
WARNING:
Property damage, environmental harm, and personal injury can result from the use of supply gas other than clean,
non-corrosive, oil and moisture free air. Do not exceed the supply pressure indicated on the serial plate located on the actuator.
Before You Begin:
Note: Standard actuators accept ¼” (6 mm) NPT connections.
• Refer to the appropriate actuator instruction manual when necessary.
Piping Installation Steps:
1Use 3/8” (outside diameter) tubing (or equivalent) for air lines.
2Install the required line vents, valves, drains, seals, and filters to the actuator.
Table 1
Globe Valve Approximate Weights lb (kg)
Valve Size
(Inch) Class Body
Flanged BWE
2 900 / 1500 160 (73) 115 (52)
3 900 275 (125) ---
3 1500 286 (130) 213 (97)
4 900 510 (231) ---
4 1500 552 (250) 444 (201)
6 900 1125 (510) ---
6 1500 1228 (557) 1003 (455)
Angle Valve Approximate Weights lb (kg)
Valve
Size Class Body
Flanged BWE
2 900 / 1500 153 (69) 110 (50)
3 1500 272 (123) 173 (78)
4 1500 399 (181) 258 (117)
6 1500 788 (357) 445 (202)

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Model 390, 391, 392 Control Valves
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Operation, Parts, and Instruction Manual
PERIODIC INSPECTION
Special Equipment Required:
• Bypass or block valves.
Before You Begin:
• Read Safety Caution (Page 2).
• Use safe work practices and lock out procedures.
• Disconnect supply lines (air or gas), electric power, or control
signal to the actuator. Sudden movement of actuator can
cause damage or injury, make sure actuator will not operate.
• Vent any pneumatic actuator loading pressure and relieve
any actuator spring preload if present.
• Relieve process pressure and drain the process fluid from up
and down stream of valve.
• Be aware of potentially hazardous process material that may
be present in-line and in-valve. Isolate the valve from
process pressure. Use a bypass or block valve if necessary,
or completely shut off the process.
Inspection Steps:
1Check for visible signs of leakage around all seal and
gasket areas.
2Check the valve for damage, especially damage caused by
corrosive fumes or process drippings.
3Clean and repaint the areas as required.
4Ensure all accessories, mounting brackets, and fasteners
are secure.
5Clean any dirt and foreign material from the valve stem
(Key 5).
ACTUATOR REMOVAL
Note: Actuator removal does not require that the valve be
removed from the pipeline.
Tools Needed:
• Properly Rated Lifting Straps or Chains
• Lifting Device (Example: Crane)
Before You Begin:
• Read Safety Caution (Page 2).
• Use safe work practices and lock out procedures.
• Disconnect supply lines (air or gas), electric power, or control
signal to the actuator. Sudden movement of actuator can
cause damage or injury, make sure actuator will not operate.
• Vent any pneumatic actuator loading pressure and relieve
any actuator spring preload if present.
1Refer to the appropriate actuator instruction manual for
more information regarding the actuator being removed.
2If the valve has been removed from the pipeline, place
the valve assembly on a flat work surface that can support
the weight.
3Before the actuator is removed, support the actuator using
lifting hooks or straps rated to support the weight of the
actuator.
4If the actuator is a spring and diaphragm actuator,
determine if that actuator is fail open or fail closed. Fail
closed actuators will need to be energized to remove
downward force from the stem connector. Connect a supply
line to the inlet port of the actuator, be sure not to exceed
the maximum casing pressure. See Figure 3 for
recommended needle valve and gauge setup.
5Remove the stem connector (Refer to Figure 5).
6Use a blunted heavy chisel to loosen the yoke nut (Key
31). Unscrew the yoke nut and remove the actuator from
the valve. If the actuator was energized during removal,
de-energize the actuator (Refer to Figure 4).
7Remove the jam nut and hex nut (Keys 29 & 30) and travel
indicator from the valve stem (Key 5).
Figure 3 Needle Valve with Gauge setup

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Operation, Parts, and Instruction Manual
MAINTENANCE
Note: Seals, soft parts, and packing (including live loaded
packing) should all be inspected frequently for leaks, wear and
damage. Maintenance to the valve can be performed while the
valve is still in-line, the actuator must be removed to replace
packing (Refer to Page 6 for Actuator Removal instructions).
Before you begin:
• Read Safety Caution (Page 2).
• Determine if valve has regular or live loaded packing (Refer
to Figures 28, 29, & 30).
• Follow Steps 1 – 6 of Before You Begin from PERIODIC
INSPECTION (Page 6).
Packing Maintenance
If the packing is leaking, proper tightening of the packing may
correct the leak. If re-tightening the packing to the proper
specifications does not stop the leakage it is possible that the
stem or wall of the packing box is damaged. Replace or repair
parts as necessary. For instructions on packing removal only,
refer to the Disassembly, Packing Removal section on Page 11.
1Determine the type of packing installed in the valve. Refer
to Figures 28, 29, and 30 for packing styles.
Figure 4 Yoke Nut being loosened with a Chisel
For Single PTFE V-Ring Packing (Spring-Loaded):
Tighten the packing nuts (Key 25) evenly in an alternating
pattern until the shoulder of the packing follower (Key 22)
makes contact with the top face of the bonnet (Key 14).
Proceed to tighten the packing nuts to the torque specification
listed in Table 3. Refer to Figure 27.
For Double PTFE V-Ring and Graphite Packing:
Tighten the packing nuts (Key 25) evenly in an alternating
pattern to the minimum recommended torque specifications
listed in Table 3 on Page 26, continue tightening until
leakage stops or the maximum torque specification is reached.
If leakage continues after reaching the maximum
recommended torque the packing will need to be replaced,
do not tighten the packing past the maximum recommended
torque as this will cause excessive packing friction.
For Live-Loaded Packing:
Refer to the Sliding Stem Live-Loaded Packing Manual (P-LLPS)
for proper maintenance procedures.
Figure 5 Packing Nut and Stem Connector Detail
31
25
STEM
CONNECTOR
29
30
32

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DISASSEMBLY
Before You Begin:
• Read Safety Caution (Page 2).
• Use safe work practices and lock out procedures.
• Remove the actuator from the valve (Refer to Actuator
Removal Instructions, Page 6).
• Relieve process pressure and drain the process fluid from up
and down stream of valve.
• Be aware of potentially hazardous process material that may
be present in-line and in-valve. Isolate the valve from
process pressure. Use a bypass or block valve if necessary, or
completely shut off the process.
• For Angle Body Valves refer to Figure 32.
PACKING REMOVAL
Special Tools Required:
• Mechanics Pick Set
NOTE: Packing box parts are easier to remove after the bonnet
(Key 14) has been separated from the valve body (Key 1) and
the valve stem (Key 5) has been removed. If the packing is all
that needs to be removed, it is possible to extract packing box
parts carefully using a mechanics pick set.
WARNING: Process medium and pressure may become stored
in the packing, use caution when removing packing parts.
1Remove the packing nuts (Key 25).
2Remove the upper wiper (Key 23) if present, graphite
packing does not include an upper wiper.
3Remove the packing follower (Key 22).
4It is recommended to proceed to the Bonnet Removal
section to continue with valve disassembly. If the packing
is all that needs to be removed, remove the contents of the
packing box (Keys 21, 20, 19, 18, & 17) using a mechanics
pick set being careful not to damage the valve stem (Key
5) or wall of the packing box of the bonnet (Key 14). For
packing reassembly refer to Packing Assembly section
(Pages 18 to 20).
Figure 6 Packing Removal (Steps 1 - 3)
BONNET REMOVAL
WARNING: Process medium and pressure may be trapped
inside the valve body (Key 1). Use caution when removing the
valve bonnet (Key 14). Refer to Safety Caution on Page 2.
1Loosen the bonnet nuts (Key 15) 1 full turn after the
contact between the nuts and the top surface of the bonnet
(Key 14) has been broken. Do not remove the bonnet nuts
until any trapped process pressure has been vented. Refer
to Figure 7.
2Break the contact between the valve body (Key 1) and the
bonnet (Key 14), use a pry bar or blunt chisel to help with
the separation if necessary.
3If no process fluid or gas escapes from the body-to-bonnet
joint proceed by completely removing the bonnet nuts (Key
15).
25
22
24
23
16
14
5

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DISASSEMBLY (Continued)
BONNET REMOVAL (Continued)
4Carefully lift the bonnet (Key 14) from the valve body (Key
1), be sure that the valve stem (Key 5) and plug (Key
3) assembly do not drop from the bonnet and get
damaged. Also, if the valve plug and stem assembly begin
to lift when lifting the bonnet, it may be necessary to
gently tap the stem from the bonnet using a rubber mallet
as the bonnet is being lifted.
TRIM PARTS REMOVAL
1Remove the valve stem (Key 5) / valve plug (Key 3)
assembly from the valve body (Key 1). Refer to Plug Seal
Removal section for instructions for disassembling Model
390 and 391 plug seals. Model 392 plugs do not have
seals.
2Remove the bonnet gasket (Key 13).
3Carefully remove the cage (Key 12).
Figure 7 Bonnet Removal (Steps 1 - 2)
Figure 8 Bonnet Removal (Steps 3 - 4)
15
14
STEP 1
CHISEL
15
14
16
13
5
2
1

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DISASSEMBLY (Continued)
TRIM PARTS REMOVAL (Continued)
4Remove the seat ring (Key 11). Refer to Figure 32 for
Angle Body valve assemblies.
5Remove the seat ring gasket (Key 10).
6Clean and inspect all parts for damage, especially gasket
seal surfaces. Replace all damaged parts and gaskets with
new parts as necessary, gaskets cannot be reused.
PLUG SEAL REMOVAL
For Model 390 Valves (See Figure 10):
1Carefully remove the retaining ring (Key 8) from the plug
groove, a pick set or flat screw driver may be required.
2Remove the backup ring (Key 7).
3 Remove the anti-extrusion ring (Key 39). The anti-
extrusion ring is only included in 390 valve assemblies
rated for over 450°F (232°C).
4Remove the seal ring (Key 6).
For Model 391 Valves (Refer to Figure 11):
1Remove the piston rings (Key 9). NOTE: Piston rings are
broken in half and can be easily pulled apart.
For Model 392 Valves (Refer to Figures 12, & 33 to 36):
NOTE: Model 392 valves do not have plug seals.
For All Models:
Clean and inspect all parts for damage, especially the stem
(Key 5) and plug (Key 3) surfaces. Minor scratches can be
buffed or lapped out, major scratches (scratches that will stop
a finger nail) will need to be machined or replaced. Replace all
damaged parts and soft parts with new parts.
Figure 9 Trim Parts Removal (Steps 1 - 6)
Figure 10
Plug Seal Removal for
Model 390 Valves
5
3
12
2
1
11
10
PLUG / STEM
ASSEMBLY
8
7
6
3
5
34*
*NOT INCLUDED IN
STANDARD ASSEMBLIES.

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Figure 11 Model 391 Piston Ring Removal
Figure 13 Packing Parts Removal (Step 1)
DISASSEMBLY (Continued)
PACKING PARTS REMOVAL
WARNING: Compressed gasses could be trapped between
packing rings.
1 Using a blunt or rounded tool or rod, carefully tap the
packing parts (Keys 21, 20, 19, 18, and 17) out of the
packing bore of the bonnet (Key 14). A mechanic’s pick set
can also be used to pull packing parts from the bore.
2Clean and inspect the bonnet for damage, pay particular
attention to the packing bore surface and the gasket
sealing surface. Replace or repair the bonnet as necessary.
Metal packing parts can be reused if they are not
damaged, all other packing parts should be replaced.
Figure 12 Model 392 Plug Diagram (Refer to Figures 36 to 39
5
9
3
14 5
13
12
4
3
11
1
10
BLUNT
ROD
14

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Operation, Parts, and Instruction Manual
LAPPING
Expect a certain amount of leakage in valves with metal
seats. In some cases where leakage has become excessive,
lapping can improve sealing performance. Before performing
the lapping process, insure all trim parts have been thoroughly
cleaned and are free of debris.
NOTE: Spiral wound gaskets (Keys 10 & 13) make their seal
by being crushed and cannot be reused, this includes gaskets
required to be used during the lapping process. It may be
desirable to use an already crushed gasket in the lapping
process to be replaced with new gaskets during reassembly.
CAUTION: Once lapping has been performed with a previously
crushed gasket, it is important to mark the position and
alignment of all trim parts (Keys 3, 11, and 12) before removal
and reassembly. If trim parts are reassembled out of their
lapped alignment excessive leakage may result.
Special Tools Required:
• Soft felt marker
• Two wrenches that will slide over the valve stem (Key 5)
• 400 – 600 grit (fine grit) lapping compound (Key D)
Lapping Procedure
1Install the used seat ring gasket (Key 10) into the valve
body (Key 1).
2Install the seat ring (Key 11). Mark the position of seat
ring using the marker.
3Install the cage (Key 12). Mark the position of cage using
the marker.
4Do not install any plug seals into the valve plug (Key 3).
Apply fine grit lapping compound to the seating surface of
the valve plug (Key 3). Install the valve plug / stem
assembly (Keys 3, 4, 5) into the valve. Mark the position of
the plug / stem assembly using the marker.
5Install a used bonnet gasket (Key 13).
6Carefully lift the bonnet (Key 14) into place and secure the
bonnet using 4 of the bonnet nuts (Key 15). Mark the
position of the valve plug (Key 3) on the bonnet (Key 14)
using the marker.
7Install the packing follower (Key 22).
8Install the jam nut (Key 29) on to the valve stem (Key 5)
and build a handle as shown in Figure 14 and 16
using the two wrenches and the hex nut (Key 30).
9Rotate the valve plug (Key 3) back and forth about
a quarter of a full rotation (only a small amount of
movement is required, do not make full rotations)
over the seat ring (Key 11) using the wrench handles.
10 If a seat leak test is to be performed after lapping to test
valve shut off, disassembly the lapping setup after a few
cycles of back and forth plug movement. Replace the used
gaskets (Keys 10 & 13) with new gaskets and reassemble
the valve for testing. NOTE: Another set of new gaskets
will need to be used for the final valve assembly if the
lapping procedure needs to be repeated after seat leak
testing.
Figure 14 Lapping Procedure Setup (Steps 1 - 8)
29
22
14
5
30
15
2
1
13
12
3
1011
WRENCH
WRENCH

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Figure 15 Lapping Compound Application
Figure 16 Lapping Procedure Setup (Steps 9 - 10)
ASSEMBLY
Before You Begin:
• Read Safety Caution (Page 2).
• Use safe work practices and lock out procedures.
• Clean and inspect all parts.
• Replace or repair damaged parts. Replace all soft parts
(Seals, o-rings, gaskets, live loaded packing).
Lubricants Required:
• Anti-Seize Compound (Key A)
• Silicone-based O-Ring Compound (Key B)
• White Petroleum Grease (Key C)
STUD INSTALLATION
1If the studs (Key 2) were replaced, removed, or never
installed, apply anti-seize compound (Key A) to the threads
of the end of the stud without a material stamp.
2Thread the studs (Key 2) into the valve body (Key 1)
anti-seize coated end first, until they are completely
threaded into the valve body.
PLUG SEAL ASSEMBLY
For Model 390 Valves:
1Apply white petroleum grease (Key C) to the surface of the
seal ring (Key 6).
2Install the seal ring (Key 6) onto the valve plug (Key 3),
refer to Figure 17 for proper seal ring orientation.
3If required, apply white petroleum grease (Key C) to the
anti-extrusion ring (Key 34) and install the anti-extrusion
ring on to the valve plug as shown in Figure 18. NOTE:
Anti-extrusion rings are only used for valve assemblies
rated to exceed 450ºF (232ºC).
4Apply white petroleum grease (Key C) to the backup ring
(Key 7) and install the backup ring onto the valve plug
(Key 3).
5Apply white petroleum grease to the retaining ring (Key
8) and install the retaining ring into the retaining ring
groove on the valve plug (Key 3).
6Allow time for the seal ring material to shrink back to its
original size after being stretched over the valve plug
before installing the plug assembly into the cage (Key 12).
5
3
APPLY FINE
GRIT LAPPING
COMPOUND
(KEY D) TO
THE SEATING
SURFACE OF
THE PLUG
30
29
15
1
14
2
16
22
5
WRENCH
WRENCH

Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
Model 390, 391, 392 Control Valves
P-390M0620A 14
Operation, Parts, and Instruction Manual
Figure 17 Model 390 Plug Seal Standard Assembly
ASSEMBLY (Continued)
PLUG SEAL ASSEMBLY (Continued)
For Model 391 Valves:
NOTE: Replacement piston rings (Key 9) come in one piece.
Before installation it is necessary to break the piston ring into
two pieces. Do not saw or cut the piston rings. Use caution
when breaking piston rings as they can be easily damaged.
Piston Ring Vise Break Method:
Piston rings (Key 9) can be broken into two pieces using a vise
with smooth jaws or jaw softeners.
Special Tools Required:
• Vise
• Electrical Tape
1Wrap electrical tape once around the outside diameter of
the piston ring (Key 9). Electrical tape will help contain
the piston ring while it is being broken. (Figure 20)
2Place the piston ring into the jaws of the vise as shown in
Figure 21.
3Slowly compress the piston ring in the vise until the ring
snaps on both sides. If one side of the piston ring snaps
first, continue compressing the piston ring until the other
side snaps as well.
Figure 18 Plug Seal Assembly with Anti-Extrusion Ring
SPRING-LOADED SEAL RING
FOR FLOW DOWN VALVES -
THE “CUP” OF THE SEAL RING
(KEY 6) FACES DOWN.
SPRING-LOADED
SEAL RING
FOR FLOW UP
VALVES - THE “CUP”
OF THE SEAL RING
(KEY 6) FACES UP.
SPRING-LOADED SEAL RING
FOR BI-DIRECTIONAL
VALVES - THE “CUP” OF THE
SEAL RINGS (KEY 6) FACE
EACH OTHER.
8C
7C
6C
3C
7
8
6
NOTE: APPLY
GREASE TO
ENTIRE
OUTSIDE
SURFACE OF
PLUG.
8
C
7
C
34
C
6
3
NOTE: KEY
39 IS TWO
PIECES AND
MUST BE
ARRANGED
AS SHOWN.
FLOW DOWN
ORIENTATION
FLOW UP
ORIENTATION
7
7
5

Model 390, 391, 392 Control Valves
Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
P-390M0620A
ASSEMBLY (Continued)
PLUG SEAL ASSEMBLY (Continued)
For Model 391 Valves (Continued):
Piston Ring Scoring Break Method:
If no vise is available, piston rings (Key 9) can be scored with
a knife and broken over a hard surface. Do not saw or cut the
piston rings in half.
1Wrap electrical tape once around the outside diameter of
the piston ring (Key 9). Electrical tape will help contain
the piston ring while it is being broken. Refer to Figure 20.
2Score (do not cut) the top surface of the piston ring.
3Place half of the piston ring over the edge of a hard surface
(such as a table edge) so that the score marks are in a
parallel line with the edge of the hard surface.
4Apply downward pressure to both sides of the piston ring
until it snaps in half.
5Remove the electrical tape. Install each half of the broken
piston ring into the piston ring groove in the valve plug
(Key 3). Refer to Figure 19.
For Model 392 Valves:
Model 392 valve plugs (Key 3) do not use plug seals of any
kind. Refer to Figure 12 on Page 11 for detail and Figures 33 to
36 on Page 25. Proceed to Trim Parts Assembly Instructions.
15
Operation, Parts, and Instruction Manual
Figure 20 Piston Ring Assembly for Model 391 Valves (Step 1) Figure 21 Piston Ring Assembly for Model 391 Valves (Step 2)
Figure 19 391 Piston Ring Installation
95
C
3
NOTE: APPLY GREASE TO
ENTIRE OUTSIDE SURFACE
OF PLUG.
NOTE: STAGGER THE
BREAKS IN THE PISTON
RINGS.

Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
Model 390, 391, 392 Control Valves
P-390M0620A 16
Operation, Parts, and Instruction Manual
Figure 22 Trim Parts Assembly
ASSEMBLY (Continued)
TRIM PARTS ASSEMBLY
NOTE: Spiral wound gaskets (Keys 10 & 13) make their seal by
being crushed and cannot be reused.
1Apply anti-seize compound (Key A) to the top and bottom
surfaces of the seat ring gasket (Key 10). Install the seat
ring gasket into the valve body (Key 1). See Figure 22.
2Install the seat ring (Key 11) into the valve body (Key 1).
Apply anti-seize compound to the top surface of the seat
ring (Key 11). Refer to Figure 32 for Angle Body valve
assemblies.
3Install the cage (Key 12).
4Apply white petroleum grease (Key B) to the side of the
valve plug (Key 3) (See Figures 17 & 19). Install the valve
plug assembly into the cage (Key 12) (See Figure 22).
5Apply anti-seize compound to the top and bottom surface
of the bonnet gasket (Key 13). Install the bonnet gasket.
BONNET INSTALLATION
Before You Begin:
• Read Safety Caution (Page 2).
• Clean and inspect all parts.
• Replace or repair damaged parts. Replace all soft parts
(Seals, o-rings, gaskets, live loaded packing).
1Apply anti-seize compound (Key A) to the gasket sealing
surface of the valve bonnet (Key 14).
2Lift and lower the valve bonnet (Key 14) into place over
the valve stem (Key 5). Be careful not to damage either
the stem, bonnet, or valve body (Key 1).
3Apply anti-seize compound (Key A) to the threads of the
bonnet studs (Key 14). Thread the bonnet nuts (Key 15)
onto the bonnet studs until hand tight.
4Stroke the valve a few times to center the valve trim.
5It may help to install the packing follower (Key 22) during
bonnet installation to act as a visual cue to indicate areas
of over or under tightening. If the packing follower begins
to bind or appear lop-sided, this is an indication that
torquing procedures in Steps 6 & 7 need to be altered to
5
A 13
2
12
11
10A 1
A
A
A
3
KEY 10, 11, 12, & 13
ANTI-SEIZE DETAIL

Model 390, 391, 392 Control Valves
Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
P-390M0620A 17
Operation, Parts, and Instruction Manual
ASSEMBLY (Continued)
BONNET INSTALLATION (Continued)
5correct areas that need more tightening or less. The
packing follower should remain centered during the
torquing process.
6Follow proper body-to-bonnet bolting procedures. Begin to
torque the bonnet nuts (Key 15) ¼ of the torque value
listed in Table 2, torque the nuts in a crisscross pattern as
shown in Figure 24. Hot torquing the valve nuts is not
recommended.
7Continue tightening the bonnet nuts (Key 15), increasing
the torque by ¼ of the final torque specification each round
of tightening while repeating the crisscross pattern until
the final torque specification is reached.
8Double check the tightness of all nuts by torquing the
nuts to the final torque specification a final time after the
final torque value was reached.
Figure 23 Bonnet Installation
1
2
3
4
1
2
3
45
6
1
2
34
5
6
7
8
Figure 24 Bolt Tightening Pattern Diagram
SAMPLE BOLT CONFIGURATIONS
5
14 15
A2
13
1

Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
Model 390, 391, 392 Control Valves
P-390M0620A 18
Operation, Parts, and Instruction Manual
Figure 25 Proper Packing Ring Installation
ASSEMBLY (Continued)
PACKING INSTALLATION
For Live Loaded packing instructions see the Live Loaded
Sliding Stem Packing Manual (Part Number P-LLPS). For other
packing arrangements refer to Figures 26, 28, 29, & 30.
Lubricants Required:
- Anti-seize compound (Key A)
- White petroleum grease (Key B)
- Silicone-based o-ring compound (Key C)
NOTE: To prevent trapping air between packing during
installation, it is recommended that packing rings be installed
one at a time using the packing follower (Key 22) to push
the packing rings in place. Do not force packing rings below
the chamfer of the packing bore before adding another ring,
packing rings should only be pushed down the thickness of the
added ring. Refer to Figure 25.
1If the packing studs (Key 16) were replaced, removed,
or never installed, apply anti-seize compound (Key A) to
the threads of the end of the stud without a material
stamp.
2Thread the studs (Key 16) into the valve bonnet (Key 14)
anti-seize coated end first until they are completely
threaded into the bonnet.
For Single Style (Spring-Loaded) Packing:
1Apply silicone-based o-ring compound (Key C) to the lower
stem wiper (Key 17). Insert the lower stem wiper into the
packing box ring (Key 18). Insert the packing box ring into
the packing bore of the valve bonnet (Key 14).
2Install the packing spring (Key 19).
3Install the special washer (Key 20).
4Apply silicone-based o-ring compound (Key C) to the PTFE
packing rings (Key 21). Install the packing rings one ring
at a time (as shown in Figure 25) in the proper order and
orientation as shown in Figure 26. WARNING: For
oxygen service do not apply silicone-based o-ring
compound, silicone-based compound in oxygen service
applications can cause an explosion.
5Install the packing follower (Key 22).
6Install the upper stem wiper (Key 23).
5
16
22
TOP OF PACKING
BOX RING (KEY 18)
PUSHED DOWN TO BE EVEN
WITH THE BOTTOM OF THE
PACKING BORE CHAMFER.
14
TOP OF FIRST PTFE PACKING
RING (KEY 21) PUSHED
DOWN TO BE EVEN WITH
THE BOTTOM OF THE
PACKING BORE CHAMFER.
18
17 C
TOP OF SECOND PTFE
PACKING RING (KEY 21)
PUSHED DOWN TO BE EVEN
WITH THE BOTTOM OF THE
PACKING BORE CHAMFER.

Model 390, 391, 392 Control Valves
Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
P-390M0620A 19
Operation, Parts, and Instruction Manual
ASSEMBLY (Continued)
PACKING INSTALLATION (Continued)
For Single Style (Spring-Loaded) Packing (Continued):
7Install the packing flange (Key 24).
8Apply anti-seize compound (Key A) to the top threads of
the packing studs (Key 16). Thread the packing nuts (Key
25) onto the threads of the packing studs, tighten the
packing nuts evenly in an alternating pattern until the
shoulder of the packing follower (Key 22) makes contact
with the bonnet (Key 14).Proceed to tighten the packing
nuts to the torque specification listed in Table 3.
For Double Style PTFE Packing:
1 Apply silicone-based o-ring compound (Key C) to the lower
stem wiper (Key 17). Insert the lower stem wiper into the
packing box ring (Key 18). Insert the packing box ring into
the packing bore of the valve bonnet (Key 14).
2Apply silicone-based o-ring compound (Key C) to the first
set of packing rings (Key 21). Install the packing rings one
ring at a time (as shown in Figure 25) in the proper order
and orientation as shown in Figure 28. NOTE: For 3/8”
(9.5 mm) valve stems, remove a packing ring from the
middle of the packing set. WARNING: For oxygen service
do not apply silicone-based o-ring compound, silicone-
based compound in oxygen service applications can cause
an explosion.
3Install the lantern ring (Key 26).
4Apply silicone-based o-ring compound (Key C) to the
second set of packing rings (Key 21). Install the packing
rings one ring at a time (as shown in Figure 25) in the
proper order and orientation as shown in Figure 28.
WARNING: For oxygen service do not apply silicone-
based o-ring compound, silicone-based compound in
oxygen service applications can cause an explosion.
5Install the packing follower (Key 22).
6Install the upper stem wiper (Key 23).
7Install the packing flange (Key 24).
8Apply anti-seize compound (Key A) to the top threads of
the packing studs (Key 16).
Figure 26 Single Style Packing Installation Diagram
25
16
5A
24
23
21 C
20
19
17C 18
14
THE SHOULDER
OF THE PACKING
FOLLOWER (KEY
22) SHOULD
MAKE CONTACT
WITH THE TOP
OF THE BONNET
(KEY 14).
FOR VACUUM PACKING
APPLICATIONS, REVERSE
THE DIRECTION OF THE
CUP OF THE PTFE PACKING
RINGS (KEY 21) AS
SHOWN.
NOTE: SILICONE-BASED
O-RING COMPOUND (KEY C)
SHOULD NOT BE USED WITH
OXYGEN SERVICE.

Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
Model 390, 391, 392 Control Valves
P-390M0620A 20
Operation, Parts, and Instruction Manual
ASSEMBLY (Continued)
PACKING INSTALLATION (Continued)
For Double Style PTFE Packing (Continued):
9Thread the packing nuts (Key 25) onto the threads of the
packing studs, tighten the packing nuts evenly in an
alternating pattern until one of the packing nuts reaches
the minimum torque requirement shown in Table 3. Tighten
the remaining packing flange nut until the packing flange
(Key 24) becomes level (is parallel with the top face of the
bonnet), refer to Figure 27.
For Graphite Packing:
1Install the packing box ring (Key 18).
2Install the first lantern ring (Key 26A).
3Install the second lantern ring (Key 26).
4Install 1 ring of graphite filament (Key 27) as shown in
Figure 25. NOTE: Graphite filament is a wound material
that typically looks like rope and is split.
5 Install 1 ring of graphite ribbon (Key 28) as shown in
Figure 25. NOTE: Graphite ribbon is compressed into rings
and not split like the graphite filament.
6Install the remainder of the graphite filament (Key 27) and
graphite ribbon (Key 28) one at a time (as shown in Figure
25) in the proper order and orientation as shown in
Figure 29.
7Install the packing follower (Key 22).
8Install the packing flange (Key 24).
9Apply anti-seize compound (Key A) to the top threads of
the packing studs (Key 16). Thread the packing nuts (Key
25) onto the threads of the packing studs, tighten the
packing nuts evenly in an alternating pattern until the
packing nuts reach the maximum recommended torque
shown in Table 3. Loosen the packing nuts and retighten
them to the minimum recommended torque shown in Table
3.
Figure 27 Double PTFE V-Ring Packing Tightening Diagram
24
TIGHTEN THE PACKING
NUTS (KEY 25) UNTIL ONE
OF THE PACKING NUTS
REACHES THE MINIMUM
TORQUE REQUIREMENT
LISTED IN TABLE 3.
5
A
24
22
14
TIGHTEN THE REMAINING
PACKING NUT UNTIL THE
PACKING FLANGE (KEY 24)
LEVELS OUT (BECOMES
PARALLEL WITH THE TOP
FACE OF THE BONNET
(KEY 14)).
23
16
14
PARALLEL