BENDIX MV-3 User Manual
®
Bendix® MV-3™ Dash Control Module
SD-03-3415
TRAILER
DELIVERY
MOUNTING
PLATE
MOUNTING
HOLES
FIGURE 1 - MV-3™ DASH CONTROL MODULE
SECONDARY
SUPPLY
AUXILIARY
PORT
(OPTIONAL)
(4)
DESCRIPTION
The Bendix® MV-3™ dash control module is a two-button,
push-pull control valve housed in a single body which includes
a dual circuit supply valve and a check valve. The MV-3
valve can duplicate the functions of any existing two or three
valve push-pull system and has the advantages of reduced
plumbing.
The MV-3™ valve body , plungers and spools are made out of
a non-metallic, non-corrosive material. All air connections
are at the back of the valve with the exception of the optional
auxiliary port as shown in Figure 1.
TRACTOR
DELIVERY
TRAILER
DELIVERY
™
EXHAUST
AUXILIARY
DELIVERY
PORT
DUAL CIRCUIT
SUPPLY
VALVE
EXHAUST
PORT
PRIMARY
SUPPLY
BOTTOM VIEW
TRACTOR SERVICE
RESERVOIR #1
TRACTOR
DELIVERY
SECONDARY
SUPPLY
SUPPLY
#1
The MV-3™ valve provides the following functions:
1 - Tractor Protection.
2 - Trailer Service Air Control.
3 - System Park.
4 - Trailer Park Only .
5 - Trailer Charge with T ractor Spring Brakes Applied (Tractor
Park Only).
6 - Supply Reservoir Selection.
7 - Primary & Secondary Reservoir Connections.
DELIVERY
SUPPLY
#2
TRAILER
SUPPLY
LINE
FIGURE 2 - MV-3™ DASH CONTROL MODULE AIR
CONNECTIONS
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
DELIVERY
TRACTOR
SPRING
BRAKES
1
OPERATION
NORMAL OPERATING POSITION (FIGURE 5)
During initial charge, with the system completely discharged,
both buttons are out (Figure 3). When system pressure
reaches 65 P.S.I., the red button (trailer supply) may be
pushed in (Figure 4) and should stay in, charging the trailer
system and releasing the trailer brakes. The yellow button
may now be pushed in which will supply air to the tractor
spring brakes, releasing them.
RED YEL
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR SERVICE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 3 - INITIAL CHARGING OR SYSTEM PARK
RESERVOIR #1
TRACTOR
SPRING
BRAKES
With both buttons pushed in, air is supplied to the trailer
and to the tractor spring brakes; all brakes are released.
RED YEL
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 5 - NORMAL OPERATING POSITION TRACTOR &
TRAILER
TRACTOR SERVICE
RESERVOIR #1
TRACTOR
SPRING
BRAKES
ACTUATION OF TRAILER PARKING OR
EMERGENCY BRAKES (FIGURE 6)
To actuate the trailer brakes only, the red button is pulled
out, exhausting the trailer supply line. The trailer brakes
are now applied either by emergency air or spring brakes,
depending on the type of trailer system.
RED YEL
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 4 - TRAILER CHARGED & TRACTOR PARKED
2
TRACTOR SERVICE
RESERVOIR #1
TRACTOR
SPRING
BRAKES
RED YEL
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 6 - TRAILER PARKED TRACTOR RELEASED
TRACTOR SERVICE
RESERVOIR #1
TRACTOR
SPRING
BRAKES
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