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SD-03-812

DESCRIPTION

The Bendix

E-2

™

and E-3

™

brake valves are single circuit brake valves

that provide the driver with single point control of the service braking

system. The valve can be either treadle operated or ﬁ tted with a lever

for a linkage connection to a conventional brake pedal. Movement of

the treadle or pedal controls the graduated application and release of

air pressure to the vehicle brake actuators, applying or releasing the

vehicle brakes.

The E-2

™

and E-3

™

brake valves utilize a rubber spring conﬁ ned in a

retainer, resulting in reduced plunger travel as compared to previous

design single circuit brake valves.

The E-3

™

brake valve differs from the E-2

™

valve in that it employs

a different piston (see insert Fig. 1), which requires greater plunger

travel. Because of the greater plunger travel, the E-3

™

valve provides

less sensitivity in the 0-40 psi application range as compared to the

E-2

™

valve. Other than the different pistons, the E-2

™

and E-3

™

valves

are identical. An identiﬁ cation washer, located under the retaining ring

in the valve’s exhaust port, provides a means of identifying the E-2

™

and E-3

™

brake valve.

The E-2

™

and E-3

™

valves have an insert type inlet/exhaust valve

assembly which can be removed without disconnecting air lines. An

exhaust check valve in the bottom of the insert prevents contaminants

from entering the valve through the exhaust port. An optional exhaust

extension is available should an exhaust carry-off line be required.

Porting consists of two (2) 1/2 inch P.T. supply ports, four (4) 3/8 inch

or 1/2 inch P.T. delivery ports, and two (2) 1/4 inch P.T. accessory ports

(in the supply portion of the valve).

OPERATION

Applying

Applying the treadle or pedal exerts a force on the plunger, rubber

graduating spring and piston. The downward movement of the piston

causes the piston stem (which is the exhaust seat) to contact the valve,

closing the exhaust. As the exhaust closes, the inlet valve moves away

from its seat. Air pressure is then allowed to ﬂ ow by the inlet valve, out

the delivery ports and to the brake actuators, applying the brakes.

Bendix

E-2

™

& E-3

™

Brake Valves

FIGURE 1 - E-3

™

BRAKE VALVE (SECTIONAL VIEW)

RETAINER

O-RING

PISTON

RETURN

SPRING

RETAINING

RING

PRELOAD

SPRING

EXHAUST CH.

VALVE SEAT

INLET/EXHAUST

VALVE

CAP SCREW

INSERT ASS’Y

SPRING SEAT

WASHER

RUBBER SPRING

RETAINER

VALVE SPRING

O-RING

DIAPHRAGM

WASHER

SCREW

MOUNTING

PLATE

TREADLE

AUXILIARY

PORTS (2)

DELIVERY

PORTS (4)

EXHAUST

SUPPLY

PORTS (2)

PISTON

E-2

™

- E-3

™

BRAKE VALVE

AUXILIARY

PORTS (2)

DELIVERY

PORTS (4)

EXHAUST

SUPPLY

PORTS (2)

1 2 3 4

Sommario

Pagina 1 - Brake Valves

1 SD-03-812DESCRIPTIONThe Bendix® E-2™ and E-3™ brake valves are single circuit brake valves that provide the driver with single point control of the

Pagina 2 - PREVENTIVE MAINTENANCE

2BalancedWhen the air pressure in the cavity beneath the piston and the air pressure being delivered to the brake actuators equals the mechanical forc

Pagina 3

3Insert DisassemblyNOTE: It is recommended that entire inlet/exhaust insert be replaced as an assembly.7. Remove o-ring (17) from check valve seat (

Pagina 4

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