Bendix Commercial Vehicle Systems E-5 BRAKE VALVE 3/04 - Manual

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DESCRIPTION
The Bendix ® E-5 ™ brake valve is a single circuit brake valve
that provides the driver with single point control of the service
brake system. The valve is a suspended pedal operated
valve, normally mounted on the engine firewall within the
vehicle cab. Porting consists of 7 supply ports, 4 delivery
ports, and one (1) 1/8 in. P.T. auxiliary supply port. Additional
identified delivery and supply ports serve as a manifold for
accessory devices. The exhaust port is equipped with a
diaphragm.
OPERATION
Applying
Applying the pedal exerts a force on the plunger, through
the rubber graduating spring and to the piston. The piston
moves and its stem, which is the exhaust seat, closes the
exhaust. As the exhaust closes, the inlet valve moves off its
seat. Air pressure from the reservoir then flows in by the
inlet valve and out the delivery ports to the air chambers
applying the brakes.
Balanced
When air pressure in the cavity beneath the piston and the
air pressure being delivered to the brake actuators equals
the mechanical force on the top of the piston, the piston lifts
and the inlet valve closes, stopping any further flow of air
from the supply line through the valve. The exhaust remains
closed, preventing any escape of air through the exhaust
port.
When brake applications are made in the graduation range,
the valve reaches a balanced position as the air pressure
beneath the piston equals the effort exerted by the driver’s
foot on the pedal. When the piston is fully depressed, the
inlet valve remains open and reservoir pressure is delivered
to the air chambers.
Releasing
If the pedal application is released and mechanical force is
removed from the top of the piston, the force produced by
the air pressure beneath the piston is then greater, and the
piston lifts, opening the exhaust in the valve. The air below
the piston and in the delivery lines is then exhausted through
the exhaust port.
SD-03-816
Bendix ® E-5 ™ Brake Valve
FIG. 1 FIG. 2
13
11
5
4
2
3
1
8
6
7
9
10
12