WLA200 Rev140407
28
CLEAN/INSPECT PRESSURE/VACUUM FOAM TANK
VENT
The pressure/vacuum foam tank valve is supplied for use on sealed foam tanks.
There are internal passageways that provide a path for air to move between the
tank and a center cavity in the vent. These passageways are self-draining and designed
to prevent splashing foam from entering the center cavity and clogging the pressure
and vacuum valves.
The pressure and vacuum valves are easily accessed and disassembled for periodic
cleaning or inspections. Unscrew the cap from the main body and lift the valves out
of the center cavity. Clean all parts with warm water.
Note: The internal pressure and vacuum valves are different sizes. Make sure
to reassemble these valves correctly.
Figure 12. Clean and Inspect Pressure/Vacuum Foam Tank Vent
Pressure Valve
Vacuum Valve
Note: It is extremely
important that the pressure
and vacuum valves are
assembled correctly.
Pressure
Valve
Center
Cavity
Vacuum
Valve
Tank
Vent
Tank
Top
Atmosphere
Vent
Cap
Main
Body
Nipple
Vent Cutaway
Diagram
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