BENDIX AR-2 ANTILOCK RELAY VALVE Manuel - Page 2
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CONTROL PORT
EXHAUST
INLET/EXHAUST VALVE
PROPORTIONING
PISTON
SUPPLY PORT
FIGURE 2 - SECTIONAL VIEW AR-2
™
AR-2
VALVE
AIR CONNECTION
Supply (to reservoir)
Delivery (to brake chamber)
Service (to brake valve rear service delivery)
Control (to delivery of trailer supply valve)
™
The AR-2
valve is part of the R-12
™
which includes the R-12
, R-14
The internal components of the relay portion of all of these
valves are interchangeable with the R-12
the same basic components are used to service all of them.
™
The AR-2
valve incorporates various crack pressures to
accommodate specific applications, the standard is 4 psi.
OPERATION
GENERAL
™
Because the AR-2
valve is actually a relay valve, the
following description of operation refers to its function in the
vehicle's air brake system and does not address the separate
antilock components and their operation. For a description
of antilock operation refer to the appropriate Service Data
Sheet covering the electronic controller used with the AR-2
2
BLEND BACK
PISTON
™
ANTILOCK RELAY VALVE
EMBOSSED IDENT.
SUP
DEL
SER
CON
™
family of relay valves
™
™
™
, BP-R1
, and AR-1
valves.
™
valve and therefore
SPRING
EXHAUST
valve (ie; SD-13-4785 covering the EC-15
controller). Other useful information regarding antilock
system components used in conjunction with the AR-2
valve is contained in publications SD-13-4793 covering the
™
M-21
antilock modulator and SD-13-4754 covering the
™
WS-20
wheel speed sensor.
INITIAL CHARGING
During the initial build up of tractor system air pressure,
reservoir air flows into the supply port and through internal
body and cover passages to the blend back piston. When
sufficient air pressure is applied to the blend back piston, it
moves against the resistance of its spring until it comes to
rest against the service piston.
Activating the trailer supply valve (dash control with red
octagonal button), simultaneously charges the trailer and
™
the AR-2
valve control port. Air entering the AR-2
control causes the proportioning piston to move toward its
stop in the cover. The integral inlet and exhaust valve is
carried along with the piston until it seats and seals the
exhaust passage. Continued movement of the proportioning
piston opens the inlet seat. With the tractor and trailer air
system fully charged the vehicle may be operated.
™
SERVICE PORT
SERVICE PISTON
RELAY PISTON
SPRING (NOT IN ALL
MODELS)
INLET/EXHAUST VALVE
DELIVERY PORT
™
electronic
™
™
valve