BENDIX SD-03-817 User Manual
1
SD-03-817
Bendix
®
E-6
®
& E-10
™
Dual Brake Valves
DESCRIPTION
The Bendix
®
E-6
®
(Figure 1) and E-10
™
(Figure 2) dual
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.
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
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
therefore, provides the driver with a less sensitive “feel”
when making a brake application. The E-10
™
dual brake
valve is generally used on buses, where smooth brake
applications contribute to passenger comfort.
applications contribute to passenger comfort.
The circuits in the Bendix
®
E-6/E-10 dual brake valves are
identi
fi
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.
and the relay piston; the secondary circuit is that portion
between the relay piston and the exhaust cavity.
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.
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.
a common exhaust protected by an exhaust diaphragm.
OPERATION
APPLYING: NORMAL OPERATION - PRIMARY
CIRCUIT PORTION
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
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.
FIGURE 1 - BENDIX
®
E-6
®
DUAL BRAKE VALVE
FIGURE 2 - BENDIX
®
E-10
™
DUAL BRAKE VALVE
3/8” P.T.
PRIMARY
DELIVERY
3/8” P.T.
PRIMARY
SUPPLY
3/8” P.T.
SECONDARY
DELIVERY
EXHAUST
3/8” P.T.
SECONDARY
SUPPLY
TREADLE
MOUNTING
PLATE
3/8” P.T.
PRIMARY
SUPPLY
3/8” P.T.
SECONDARY
SUPPLY
3/8” P.T.
PRIMARY
DELIVERY
EXHAUST
3/8” P.T.
SECONDARY
DELIVERY
MOUNTING
PLATE
TREADLE
BOOT