Post-Discharge Maintenance
October 2014 6-4 06-236115-001
6-2.4 Replacing 3-Inch Valve Pilot Check
Note: Refer to Figure 6-4 for items.
1. Remove the valve cap.
2. Using retaining ring pliers, remove the retaining ring holding the pilot check, spring, and
disk in place. Save the retaining ring.
3. Remove the disk, spring, and pilot check. Save the disk.
4. Install the new pilot check and new spring.
5. Place the disk in and hold the assembly in place with the retaining ring.
6. Make sure the pilot check moves freely.
Figure 6-4. 3-Inch Valve Pilot Check Assembly
6-2.5 Valve Assembly (1½ in, 2 in and 2½ in Valve)
Note: The items refer to Figure 6-1.
1. Install the O-ring in the piston groove.
2. Press the piston back into the valve body.
3. Install the spring.
4. Install the O-ring (Item 1) onto the groove in the valve cap, screw the cap into the valve
body and torque to 250 in lb (28.2 N-m).
5. If the siphon tube had to be removed to disassemble the valve, wire brush the siphon tube
threads to remove the old Loctite® residue.
6. Apply a film of Loctite® primer to the siphon tube threads and allow three to five minutes
to dry.
7. Apply a film of Loctite® sealant to the threads and reinstall the siphon tube.
8. Install the O-ring onto the valve neck groove, screw the valve and siphon tube into the
cylinder, and torque to 50 to 55 ft lb (68 to 75 N-m).
CAUTION
If the siphon tube is being replaced due to damage or wear, contact Kidde
Fenwal Inc. to ensure the proper replacement part is ordered based on the
manufacturing date of the valve.
CAUTION
Make certain that the Teflon
®
back-up ring is below the O-ring as shown in
Figure 6-2.
Valve Cap
Pilot Check
Spring
Disk
Retaining Ring
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