Bendix Commercial Vehicle Systems E-15 BRAKE VALVE 3/04 User Manual

E-12, E-15, Dual brake valve

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background image

1

®

SD-03-826

Bendix

®

E-12

& E-15

Dual Brake Valve

FIGURE 1 - E-12

AND E-15

DUAL BRAKE VALVES

The E-12

and E-15

valves are designed such that the

treadle does not sit in an upright position until the air sys-
tem is built up to full reservoir pressure. The supply pressure
moves the primary piston upward transmitting a mechanical
force to the spring retainer and plunger of the treadle
assembly, causing the treadle to move upright.

TREADLE

MOUNTING

PLATE

PRIMARY

DELIVERY

DEL-1

21

(

)

SECONDARY

DELIVERY

DEL-2

22

(

)

PRIMARY

SUPPLY

SUP-1

11

(

)

PRIMARY

SUPPLY

SUP-2

12

(

)

(

)

SECONDARY

DELIVERY

DEL-2

22

PRIMARY

DELIVERY

DEL-1

21

(

)

UPPER

BODY

ASSEMBLY

DESCRIPTION

The E-12

and E-15

dual brake valves are floor mounted,

treadle operated type brake valves with two separate supply
and delivery circuits for service and secondary braking. The
separation of circuits provides the driver with a graduated
control for applying and releasing the vehicle brakes.

The E-12

and E-15

brake valves are similar in design with

the exception of the rubber spring (9) and spring retainer (7)
located in the upper body. The rubber spring which is used
in the E-12

brake valve alters the performance of the valve

such that the primary circuit delivers full reservoir pressure
to the spring brakes with less treadle travel than that of the
E-15

brake valve. See Figure 2 for delivery pressure versus

treadle travel diagram. The greater treadle travel of the E-15

brake valve yields a more gradual delivery of air to the spring
brakes resulting in a less sensitive “feel” to the driver when a
brake application is made. This characteristic makes the
E-15

brake valve more adaptable to transit vehicle applica-

tions where smooth brake applications contribute to
passenger comfort.

EXHAUST

LOWER

BODY

ASSEMBLY

E-12

DUAL

BRAKE VALVE

TREADLE TRAVEL

PRIMARY DELIVERY

(PSI)

E-15

DUAL

BRAKE VALVE

TREADLE TRAVEL

PRIMARY DELIVERY

(PSI)

↑↑↑↑↑

↑↑↑↑↑

FIGURE 2 - TREADLE TRAVEL VERSUS DELIVERY
PRESSURE

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