BENDIX E-10 Service Data

® ®
Bendix E-6 & E-10
BOOT
3/8" P.T.
PRIMARY
DELIVERY
3/8" P.T.
SECONDARY
DELIVERY
FIGURE 1 - BENDIX ® E-6 ®
DESCRIPTION
The Bendix ® E-6 ® (Figure 1) and E-10
brake valves are fl oor-mounted, treadle-operated type
brake valves with two separate supply and delivery
circuits for service (primary) and secondary braking. Each
provides the driver with a graduated control for applying
and releasing the vehicle brakes.
The E-10 ™ dual brake valve (Figure 2) is similar to the E-6
dual brake valve except that a metal coil spring housed in
an upper body assembly replaces the rubber spring used
®
in the E-6 valve. The use of a metal coil spring (and the
upper body assembly) provides greater treadle travel and,
therefore, provides the driver with a less sensitive "feel"
when making a brake application. The E-10
valve is generally used on buses, where smooth brake
applications contribute to passenger comfort.
The circuits in the Bendix
identifi ed as follows: The primary circuit is that portion of the
valve between the spring seat which contacts the plunger
and the relay piston; the secondary circuit is that portion
between the relay piston and the exhaust cavity.
™
Dual Brake Valves
TREADLE
MOUNTING
PLATE
3/8" P.T.
SECONDARY
SUPPLY
EXHAUST
DUAL BRAKE VALVE
™ (Figure 2) dual
™
dual brake
®
E-6/E-10 dual brake valves are
MOUNTING
PLATE
3/8" P.T.
PRIMARY
DELIVERY
3/8" P.T.
PRIMARY
3/8" P.T.
SUPPLY
SECONDARY
DELIVERY
FIGURE 2 - BENDIX
The primary circuit of the valve is similar in operation to a
standard single circuit air brake valve, and – under normal
operating conditions – the secondary circuit is similar in
operation to a relay valve.
Both primary and secondary circuits of the brake valve use
a common exhaust protected by an exhaust diaphragm.
OPERATION
®
APPLYING: NORMAL OPERATION - PRIMARY
CIRCUIT PORTION
When the brake treadle is depressed, the plunger exerts
force on the spring seat, graduating spring, and primary
piston. The primary piston, which contains the exhaust
valve seat, closes the primary exhaust valve. As the
exhaust valve closes, the primary inlet valve is moved
off its seat, allowing primary air to fl ow out the primary
delivery port.
TREADLE
SECONDARY
EXHAUST
® ™
E-10 DUAL BRAKE VALVE
3/8" P.T.
PRIMARY
SUPPLY
3/8" P.T.
SUPPLY
1