Post-Discharge Maintenance
06-236115-001 6-3 October 2014
6-2.3 Valve Disassembly (3-inch Valve)
Note: Refer to Figure 6-3 and Table 6-3 for items.
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.
Figure 6-3. 3-inch Valve Assembly
WARNING
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
then depress the pressure check in the Supervisory Pressure Switch.
Table 6-3. 3-inch Valve Components
Description Part Number
O-ring, Cap WK-566102-410
O-ring, Piston WK-566103-370
O-ring, Seat WK-566103-400
O-ring, Neck WK-566103-470
O-ring, Inner Piston WK-566101-170
Back-up Ring WK-554003-400
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
Inner Piston O-Ring
WK-566101-170
Neck O-Ring
WK-566103-470
Refill Part
(½ inch NPT Thread)
Safety Cap
Piston
Spring
Valve Cap O-Ring
WK-566102-410
Pilot Check
WK-923066-000
Pilot Check Spring
WF-230640-000
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