BENDIX BW1622 User Manual download pdf

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

( )

SECONDARY

DELIVERY

DEL-2

( )

PRIMARY

SUPPLY

SUP-1

( )

PRIMARY

SUPPLY

SUP-2

( )

SECONDARY

DELIVERY

DEL-2

PRIMARY

DELIVERY

DEL-1

( )

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

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - SD-03-826

1®SD-03-826Bendix® E-12™ & E-15™ Dual Brake ValveFIGURE 1 - E-12™ AND E-15™ DUAL BRAKE VALVESThe E-12™ and E-15™ valves are designed such that the

Page 2 - OPERATION

2FIGURE 4 - TYPICAL PIPING SCHEMATICFIGURE 3 - E-12™ DUAL BRAKE VALVE CROSSSECTIONAL VIEW263031321014252415LOWER BODY1819UPPER BODY5768915131017121314

Page 3

3BALANCED: PRIMARY CIRCUIT PORTIONWhen the primary delivery pressure acting upon the primarypiston (2), equals the resultant mechanical force of the b

Page 4 - PREVENTIVE MAINTENANCE

4FIGURE 8 - BALANCED POSITIONBALANCED: SECONDARY CIRCUIT PORTIONWhen the air pressure on the secondary side of the relaypiston approaches the pressure

Page 5 - PERSONAL INJURY OR DEATH:

5OPERATION & LEAKAGE CHECKSGENERALA change in vehicle braking characteristics or a low pres-sure warning may indicate a malfunction in one or the

Page 6

6FIGURE 10 - EXPLODED VIEW7(E-12)232122162425LOWER BODY1415131211101918207 (E-15)6189 (E-12)34514154213121110UPPERBODY17

Page 7 - CLEANING & INSPECTION

7DISASSEMBLYThe following disassembly and assembly procedure is pre-sented for reference purposes and presupposes that a majorrebuild of the brake val

Page 8 - VALVE INSTALLATION

8ASSEMBLY1. Using the lubricant provided (Bendix Pc. No. 291126),lightly coat all o-rings, o-ring bores and grooves. Lightlylubricate the primary pist

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BENDIX BW1622 User Manual

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