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TM 10-4210-235-13
2-3. DRY CHEMICAL SYSTEM.
See figure 2-2 for location of dry chemical system controls and indicators.
1.
CYLINDER DISCHARGE VALVE
When opened, pressurizes the dry chemical system.
2.
CYLINDER PRESSURE GAGE
Gives a continual reading of cylinder pressure. Normal reading, fully charged, 2400 psi (16560 kPa) at 70° F (21°
C). Minimum pressure required for operation, 1750 psi (12075 kPa) at 70 F (21° C).
3.
BALL VALVE
Controls the pressurization of the dry chemical tank.
4.
BALL VALVE
Controls the tank bypass line to permit purging of the discharge lines and dispensing hose with nitrogen directly
from the nitrogen cylinder.
5.
RY CHEMICAL VALVE ROD
Extends the dry chemical shut-off valve control to the rear of the unit for easy access. Used to control outlet of dry
chemical tank.
6.
FIRE HOSE NOZZLE
When the nozzle lever is squeezed, the shut-off valve opens to discharge the dry chemical onto the fire.
7.
QUICK-COUPLING HALF
Used to remove the fire hose nozzles and attach the hose ends when connecting to the remote hose reel.
2-4
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