BENDIX E-10 DUAL BRAKE VALVES Manual

®
Bendix ® E-6 ™ & E-10
BOOT
3/8" P.T.
PRIMARY
DELIVERY
3/8" P.T.
SECONDARY
DELIVERY
EXHAUST
™
FIGURE 1 - E-6 DUAL BRAKE VALVE
DESCRIPTION
™
The E-6 (Figure 1) and E-10
are floor mounted, treadle operated type brake valves with
two separate supply and delivery circuits for service (pri-
mary) and secondary braking, which 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, there-
fore, provides the driver with a less sensitive "feel" when
making a brake application. The E-10
generally used on buses, where smooth brake applications
contribute to passenger comfort.
™
The circuits in the E-6 /E-10
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.
PRIMARY
SUPPLY
3/8" P.T.
SECONDARY
SUPPLY
™
(Figure 2) dual brake valves
™ dual brake valve is
™
dual brake valves are identified
MOUNTING
PLATE
3/8" P.T.
PRIMARY
DELIVERY
3/8" P.T.
SECONDARY
DELIVERY
EXHAUST
™
FIGURE 2 - E-10 DUAL BRAKE VALVE
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 flow out the primary delivery port.
TREADLE
3/8" P.T.
PRIMARY
SUPPLY
3/8" P.T.
SECONDARY
SUPPLY
1