R4 Series Relief Valve
Maintenance Instructions
Seal and Stem Replacement
Instructions
Contents:
•
1 quad seal
• 1 O-ring
• 1 bonded stem
Quad Seal and O-Ring Replacement
1. Remove valve from system.
2. Loosen cap to relieve spring pres-
sure.
3. Remove bonnet from body.
4. Remove stem and retainer from
bonnet.
5. Remove quad seal from bonnet.
6. Make sure all parts are clean
before reassembly.
7. Install new quad seal into bonnet.
(Lubricate with system compatible
lubricant.)
8. Place retainer in bonnet, then insert
stem into bonnet through retainer
and quad seal.
9. Remove and replace bonnet
O-ring. (Lubricate with system
compatible lubricant.)
10. Thread bonnet into body and
torque to 400 in.·lb. (45 N·m).
11. Adjust desired set pressure as
described in steps 7 through 10 in
the Spring Installation section on
reverse side.
12. Install valve in system. Grip valve
on wrench pad during installation.
Spring Kit Identification
Spring Kit
Ordering
Number
Color
Code
Nominal
Cracking
Pressure
psig (bar)
Initial Cap
Position
,
number of turns
177-13K-R4-A
Blue
50 to 350
(3.4 to 24.1)
12.5
177-13K-R4-B
Yellow
350 to 750
(24.1 to 51.7)
13.5
177-13K-R4-C
Purple
750 to 1500
(51.7 to 103)
13.5
Cap
Lock Nut
Bonnet
O-Ring
Quad Seal
Retainer
Bonded Stem
Body
Stem and O-Ring Replacement
1. Remove valve from system.
2. Loosen cap to relieve spring
pressure.
3. Remove bonnet from body.
4. Remove stem from bonnet.
5. Make sure all parts are clean
before reassembly.
6. Place new stem into bonnet.
7. Remove and replace bonnet
O-ring. (Lubricate with system
compatible lubricant.)
8. Thread bonnet into body and
torque to 400 in.·lb. (45 N·m).
9. Adjust desired set pressure as
described in steps 7 through 10 in
the Spring Installation section on
reverse side.
10. Install valve in system. Grip valve
on wrench pad during installation.
A Swagelok Pre-Engineered Subsystem Fast Loop Module
36
