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SD-03-830
E-8P & E-10P DUAL BRAKE VALVES
DESCRIPTION
Refer to Figures 4, 5 and 6 for item numbers referenced in
parenthesis.
The E-8P (Figure 1) and E-10P (Figure 2) Dual Brake Valves
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-10P Dual Brake Valve (Figure 2) is similar to the E-8P
Dual Brake Valve except that a metal coil spring (5) housed
in an upper body assembly replaces the rubber spring (27)
used in the E-8P 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-10P Dual Brake
Valve is generally used on busses, where smooth brake
applications contribute to passenger comfort.
The circuits in the E-8P/E-10P Dual Brake Valves are
identified as follows: The No. 1 or primary circuit is that
portion of the valve between the spring seat which contacts
the plunger and the relay piston; the No. 2 or 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 op-
erating 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.
FIGURE 1 - E-8P
FIGURE 2 - E-10P
VALVE
MOUNTING
PLATE
TREADLE
SUPPLY
DELIVERY
(4)
AUXILLIARY
SUPPLY
VALVE
MOUNTING
PLATE
TREADLE
DELIVERY
(4)
SUPPLY
(4)
EXHAUST
EXHAUST
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