Swagelok IPT Series Manuale utente
NVT Kit Contents
This kit contains the stem assembly shown below.
NOTE: The image below may vary from the actual stem assembly. Compare the kit contents with
the original stem assembly in the valve as well as the packing sequence found on page 2.
Moly-lithium grease is required for repair, but is not included with the kit.
IPT Series Manual NVT Needle Valve
Service Instructions
Stem Assembly
Tools Required
(1) Lubricant Packets
Part Size Tool
Valve body —
Bonnet
capable of 75 ft·lb (101 N·m)
5/8 in.
Socket head cap screw —
Bench vise
Torque wrench
Crow’s foot adapter
T20 Torx®bit
Y Stem Series
Component Packing
1Packing gland
2Lower stem
3Top packing washer
4Packing ring
5Bottom packing washer
A, B, E and G Stem Series
Component Packing
1Packing gland
2Lower stem
3Top packing washer
4Packing ring
5Bottom packing washer
Handle
Bonnet
Stem assembly
Valve body
Upper stem
Socket head cap screw
Spring
Retaining ring
Lower stem
Packing
sequence
Exploded View
Valve Assembly
Stem
Assembly
Stem Series Packing Sequence
M and W Stem Series
Component Packing
1Packing gland
2Lower stem
3Top packing washer
4Nylon packing ring
5Packing ring
6Bottom packing washer
5
1
3
4
2
6
1
3
4
2
5
5
1
3
4
2
* Bold indicates
kit component
Note: Reference the ordering number to determine the
stem assembly series.
Example: NVT4H1VY3D
2
Stem assembly series
Valve Reassembly
1. Apply Moly-Lithium grease liberally to the outside
diameter (OD) threads of the upper stem.
•WARNING
Before removing the valve from service,
to avoid personal injury, you must:
• Depressurize the system.
• Cycle the valve.
• Purge system to remove any residual
system media left in valve.
NOTICE
Do not scratch any sealing surfaces while
following these instructions. Scratches
on the sealing surfaces may affect valve
performance.
Disassembly
1. Remove the valve from the system.
2. Place the valve in the vise.
3. Loosen the socket head cap screw and remove
the handle assembly.
3
Instructions
5. Remove the stem assembly.
6. Discard the stem assembly.
7. Clean the valve body and bonnet.
2. Assemble the bonnet onto the upper stem until
bottomed.
NOTICE
To prevent damage to the sealing area during
reassembly, thread the stem to the fully open
position prior to insertion into the valve body.
3. Apply the supplied MS-LTK-WL8-1 lubricant lightly
to the packing and packing rings of the exposed
lower stem.
Bonnet
Stem assembly
Upper stem
Liberal
Moly-Lithium grease
Bonnet
Upper stem
Socket head cap screw
Handle
assembly
4. Loosen and remove the bonnet.
Bonnet Light
MS-LTK-WL8-1 lubricant
Lower stem
Stem packing
For additional information, see www.swagelok.com.
Swagelok — TM Swagelok Company
Torx — TM Textron Inc.
©2019-2022 Swagelok Company
MS-CRD-0226, RevA, January 2022
4. Refer to the stem series components found on
page 2 to conrm the proper sequence of the
stem assembly. Reference the ordering number to
determine the stem assembly series.
Example: NVT4H3VM60
Insert the stem assembly into the valve body.
Torque the bonnet according to the torque chart
below.
Required Torque
ft·lb (N·m)
Socket Head Cap Screw
3.0 to 4.0 (4.1 to 5.4)
5. Place the handle assembly onto the upper stem.
Torque the socket head cap screw according to the
torque chart below.
Required Torque
ft·lb (N·m)
Stem
Series Bonnet
A, E, G 45 to 50 (61.0 to 67.7)
B70 to 75 (94.9 to 102)
M, Y 60 to 65 (81.3 to 88.1)
Bonnet
Stem assembly
Valve body
Handle
assembly
Socket head cap screw
Upper stem
Stem assembly series
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