6-2.3 Valve Disassembly (3-Inch Valve) - Kidde Fire Systems ECS Manual

6-2.3 Valve Disassembly (3-inch Valve)
Note: Refer to Figure 6-3 and Table 6-3 for items.
Before removing the valve, make sure that all pressure has been relieved from
the cylinder. To relieve any remaining pressure, ensure the cylinder is secured
WARNING
then depress the pressure check in the Supervisory Pressure Switch.
1. Remove the valve with the siphon tube from the cylinder.
2. Remove the cylinder neck O-ring and replace it. Before reinstalling the O-ring, apply lubri-
cant.
3. Remove the valve cap, spring and piston assembly.
Note: Remove all internal components of the HFC-227ea valve from the top of the assembly.
However, if there is excessive piston O-ring friction, the siphon tube may have to be
removed and the piston assembly pressed out from the bottom.
4. Remove the O-rings and replace them. Before reinstalling the O-rings, apply lubricant.
5. Ensure that the O-ring protrudes a minimum of 0.020 in. (0.5 mm) above the conical seat-
ing surface of the piston assembly. Replace this O-ring by removing the seat retainer. Be-
fore reassembling, apply lubricant to the O-ring.
6. Examine the pilot check for any evidence of bending or other damage. Depress the check
and make certain it snaps back freely. Replace pilot check if necessary.
06-236115-001
Pilot Check
WK-923066-000
Pilot Check Spring
WF-230640-000
Valve Cap O-Ring
WK-566102-410
Spring
Piston
Safety Cap
Refill Part
(½ inch NPT Thread)
Neck O-Ring
WK-566103-470
Inner Piston O-Ring
WK-566101-170
Figure 6-3. 3-inch Valve Assembly
Table 6-3. 3-inch Valve Components
Description
O-ring, Cap
O-ring, Piston
O-ring, Seat
O-ring, Neck
O-ring, Inner Piston
Back-up Ring
Valve Cap
Piston O-Ring
WK-566103-370
Back-Up Teflon Ring
WK-554003-400
Retainer O-Ring
WK-566103-400
Retainer
06-235924-001
Part Number
WK-566102-410
WK-566103-370
WK-566103-400
WK-566103-470
WK-566101-170
WK-554003-400
6-3
Post-Discharge Maintenance
October 2014