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®
®
™
Bendix
E-12
& E-15
UPPER
BODY
ASSEMBLY
PRIMARY
DELIVERY
(
)
DEL-1
21
SECONDARY
DELIVERY
(
DEL-2
)
22
LOWER
BODY
ASSEMBLY
™
FIGURE 1 - E-12
AND E-15
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.
™
Dual Brake Valve
TREADLE
EXHAUST
™
DUAL BRAKE VALVES
MOUNTING
PLATE
PRIMARY
SUPPLY
SUP-1
(
)
11
PRIMARY
SUPPLY
SUP-2
(
)
12
The E-12
™
and E-15
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.
E-12
BRAKE VALVE
™
TREADLE TRAVEL
FIGURE 2 - TREADLE TRAVEL VERSUS DELIVERY
PRESSURE
™
valves are designed such that the
™
DUAL
BRAKE VALVE
TREADLE TRAVEL
PRIMARY
DELIVERY
(
DEL-1
)
21
SECONDARY
DELIVERY
(
DEL-2
)
22
E-15
™
DUAL
1
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Related Manuals for BENDIX E-12-E-15 BRAKE VALVE
Summary of Contents for BENDIX E-12-E-15 BRAKE VALVE
- Page 1 ® ® ™ ™ Bendix E-12 & E-15 Dual Brake Valve TREADLE MOUNTING UPPER PLATE BODY ASSEMBLY PRIMARY SUPPLY PRIMARY PRIMARY SUP-1 DELIVERY DELIVERY DEL-1 DEL-1 PRIMARY SECONDARY SUPPLY SECONDARY DELIVERY SUP-2 DELIVERY DEL-2 DEL-2 LOWER BODY EXHAUST ASSEMBLY ™...
- Page 2 ™ ™ The circuits in the E-12 /E-15 valves are identified as follows: The no. 1 or primary circuit is that portion of the valve between the primary piston (2) and the secondary piston (18); the no. 2 or secondary circuit portion consists of the area between the secondary piston and the exhaust cavity.
- Page 3 PLUNGER PLUNGER FORCE FORCE SUP-1 SUP-1 DEL-1 DEL-1 DEL-2 DEL-2 SUP-2 SUP-2 EXHAUST EXHAUST FIGURE 5 - APPLYING - NORMAL OPERATION FIGURE 6 - APPLYING - FAILURE IN THE PRIMARY CIRCUIT BALANCED: PRIMARY CIRCUIT PORTION APPLYING: NORMAL OPERATION- SECONDARY CIRCUIT PORTION When the primary delivery pressure acting upon the primary piston (2), equals the resultant mechanical force of the brake The relay piston moves down with the primary piston and...
-
Page 4: Preventive Maintenance
RELEASING: PRIMARY CIRCUIT PORTION PLUNGER FORCE When the force on the brake treadle is released, the me- chanical force is removed from the graduation spring (8) and the primary piston (2). Air pressure in the delivery circuit moves the primary piston exhaustive valve, allowing air pres- sure in the primary piston to exhaust through the exhaust port. -
Page 5: Personal Injury Or Death
Bendix outlets. Always check the 4. If the work is being performed on the vehicle’s air... - Page 6 7 (E-15) (E-12) 9 (E-12) LOWER BODY UPPER BODY FIGURE 10 - EXPLODED VIEW...
-
Page 7: Cleaning And Inspection
7. Carefully remove and discard the exhaust diaphragm lubricated. retainer (24) and exhaust diaphragm (25) from the lower Note: Some treadle/pedal assemblies, not furnished by body. Bendix, do not employ a roller in which case make cer- Note: Some E-12 ™ & E-15 ™... -
Page 8: Valve Installation
11. Install the plunger (21) in its return spring (22). Install the spring and plunger on the secondary piston (18). BW1622 © 2004 Bendix Commercial Vehicle Systems LLC. All rights reserved. 3/2004 Printed in U.S.A.