06-237553-001 3 August 2016
3 POST-FIRE MAINTENANCE
Some components in the agent valve assembly will need to be inspected and serviced before
recharging the cylinder/valve assembly. All O-rings must be replaced whenever a valve is
disassembled. Part numbers for items which may require replacement are listed in Table 3.
3.1 2” Valve Disassembly
Note: Replace O-rings when rebuilding the valve. Never reuse old O-rings.
1. Remove the valve with the siphon tube from the cylinder.
2. Remove the cylinder neck O-ring (Item 2 in Figure 1) and discard the O-ring.
3. Remove the valve cap and spring. Remove the Cap O-ring (Item 1) and discard the O-ring.
Note: Remove all internal components of the agent valve from the top of the assembly. How-
ever, if there is excessive friction at the piston, the siphon tube may have to be removed
and the piston assembly pushed out the valve body from the bottom.
4. Remove the piston assembly (Item 3).
5. Examine the Schrader valve core pin (Item 4) for any evidence of bending or other damage.
Depress the pin and make certain it snaps back freely. Replace the valve core if necessary
using a standard Schrader core wrench. When reinstalling a new Schrader core element,
torque to 1½ to 3 in· lb (0.17 to .34 N-m).
Figure 1. Valve Assembly
WARNING
Before removing the valve, make certain all pressure has been relieved from the
cylinder. To relieve any remaining pressure, make sure the cylinder is secure,
then depress the pressure switch Schrader valve until all pressure is relieved.
CAUTION
After reinstalling a Schrader core, the distance from the top of the core pin to
the control head seating surface must fall between the dimensions of 0.515 in
to 0.565 in (13 mm to 14 mm) when in the “shut” or non-actuated position (see
Figure 1).
Gauging Dimension:
.515 - .565 in.
Cap O-ring
Piston
Assembly
Valve Cap
Spring
Siphon Tube
Schrader Core
Neck O-ring
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