TM 5-2330-305-14
Height Control Valve (1.3.5.6)
Override Assembly (1.3.5.7)
Air Spring (1.3.5.8)
1.3.5.1 AIR STORAGE TANKS. Stores pressurized air for brake and air ride
actuation.
Tanks 1, 2 and 4 supply brake system while tank 3 supplies air ride
system only.
1.3.5.2 RELAY QUICK RELEASE VALVES.
Speeds up application and release of brakes
by shortening the length of tubing which air from the brake valve must pass. It is
connected directly to the air storage tanks to utilize the pressurized storage air
for brake actuation.
1.3.5.3 RATIO RELAY VALVE. Determines pressure differential between service and
emergency lines to apply or release pressure to brake chamber emergency diaphragm.
1.3.5.4 BRAKE CHAMBER. Through two counteracting diaphragms, converts pneumatic
force to linear mechanical force. The linear force is utilized by the brake system
to expand the brake shoes against the brake drum.
a. Emergency Diaphragm. Provides fail-safe emergency braking in the event
system pressure is lost. The high pressure return spring, which provides adequate
force for brake activation, is counteracted by the emergency diaphragm under normal
operating conditions. The diaphragm is connected to the pushrod and controlled by
the ratio relay valve.
b. Return Spring. Provides 1800 lbs (816.5 kg) of force to the pushrod for
brake application. The spring is counteracted by the emergency diaphragm air
pressure and extends to apply brakes if emergency air pressure decreases.
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