Swagelok KFB Series Technical specifications

Kit Contents
KFB Series Regulators
Maintenance Instructions
Lubricant
MS-LT-WL8
Seat retainer
Tools Required
Seat
Diaphragm
Tool Size Component
Vise
-Body
Socket
18 mm Seat retainer
11/16 in. or 17 mm Antitamper nut
Torque wrench
Capable of
236 ft·lb (320 N·m, 32.7 m·kg))
Seat retainer,
Cap ring
Tool Kit
Large cap ring spanner
2 7/8 in. or 73 mm Cap ring
Retainer seal
Symbols
Lightly lubricate
Discard
NOTE: See Pressure Regulators, MS-02-230, for tool kit ordering information.

Exploded View
2
Seat Assembly
Cover
Stem nut
Handle
Body Seat retainer
Seat
Retainer seal
Stem
Spring button
Spring stabilizer
Range spring
Diaphragm
Stop plate
Cap ring
Body cap

3
WARNING
Before removing a regulator from the system for
service, you must
• depressurize system
• purge the system to remove any residual
system media left in the regulator.
Disassembly
1. Place the regulator in a vise.
2. Turn the handle counterclockwise until it stops.
Note: Handle and stem nut position are factory set. If
they are removed, they will have to be reset to that
position.
Note: If using an antitamper nut, remove it from the body.
Then turn the stem counter clockwise until it stops.
3. Loosen the cap ring.
4. Remove the cap assembly and handle as one piece and
set aside for later use.
Note: The range spring may fall from the cap assembly
when lifted. Set aside for later use.
5. Remove the diaphragm and the stop plate.
NOTICE
Do not damage the diaphragm sealing face on the
body. Leakage could result.
6. Loosen and remove the seat assembly. Discard the seat,
seat retainer, and the retainer seal.
NOTICE
Be careful not to scratch the inside of the body.
Leakage could result.
Cap ring
Handle
Large cap ring spanner
Diaphragm
Stop plate
Body
Seat retainer
Seat
Body
Retainer seal
Cap assembly
Range spring

4
Swagelok — TM Swagelok Company
© 2010-2019 Swagelok Company
March 2019, RevC
MS-CRD-0133
For additional information, see www.swagelok.com.
Reassembly
NOTICE
Ensure all parts and tools are free of debris or
damage.
7. Insert the retainer seal with the groove facing away from
the seat retainer and the seat into the seat retainer.
8. Fully thread the seat assembly into the body.
9. Tighten the seat assembly to 30 ft·lb (40 N·m, 4 m·kg).
10. Install the diaphragm with the large leading convolution
facing towards the body.
Seat assembly
Body
Diaphragm
Body
Large leading convolution
11. Install the stop plate onto diaphragm with the boss on
the stop plate facing away from the diaphragm.
12. Reinsert the range spring into the cap assembly if
necessary.
13. Thread the cap assembly onto the body and tighten the
cap ring to 236 ft·lb (320 N·m, 32.7 m·kg).
14. Test the regulator for proper operation.
15. If using an antitamper nut, thread the antitamper nut onto
the stem after the set outlet pressure is reached. Tighten
the nut to 13 ft·lb (17.5 N·m, 1.8 m·kg).
Seat retainer
Retainer seal
Seat
Groove Range spring
Cap assembly
Stop plate
Diaphragm
Boss
Cap ring
Large cap ring spanner