Post-Discharge Maintenance
April 2020 7-8 06-237619-001
7-6.4.2 Nitrogen Cylinder I-Valve Assembly
After each part has been thoroughly inspected, assemble the valve in the following order:
1. Install the new siren check assembly.
2. Install the brass sleeve.
3. Install the sleeve retainer.
4. Install the spring.
Note: The main check assembly is installed with the rubber seat facing up. The copper sealing
gasket MUST be replaced when the valve seat is removed. Refer to Figure 7-3.
5. Install the new main check assembly.
6. Install the new copper gasket (rounded side up). Apply a lubricant to the gasket before re-
placing.
7. Install the valve seat. Torque to 150 ± 15 ft·lb. (203 ± 20 N-m).
7-6.4.3 Safety Disc Replacement
1. Remove the safety disc retainer, along with the safety disc and safety disc washer from the
valve body.
2. Assemble the safety disc retainer, the new safety disc and the new safety disc washer to
the valve body. Refer to Table 7-3 for torque values.
WARNING
Never install any type disc other than the specified compliment for the cylinder.
Installing the incorrect disc could result in violent rupture of the cylinder
causing serious personal injury.
Never reinstall a used safety disc and/or washer. Once the retainer has been
removed, the disc and washer must be replaced with new parts.
Table 7-3. Safety Disc Replacements for the I-Valve
Nitrogen Cylinder
Safety Disc and
Washer P/N
Safety Disc
Retainer Nut P/N
Torque Value PSIG @ 70°F
90-101040-000 81-902048-000
(white)
WK-220034-000 350 +
35 in. lb. 2900-3250
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