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™
EC-16
CONTROLLER
™
ATR-1DC
ANTILOCK
TRACTION
RELAY
VALVE
FIGURE 2 - TYPICAL AT-1DC
The ATR-1DC
™
valve is part of the R-12
™
which includes the R-12
valves. The internal components of the relay portion of all of
these valves are similar and in many cases interchangeable
™
with the R-12
valve and therefore the same basic
components are used to service all of them. The ATR-1DC
valve is available with various crack pressures to
accommodate specific applications, however the standard
is 4 psi, achieved without any added spring.
™
™
EC-16
OR EC-17
CONTROLLER
SOLENOID
CONNECTOR
BLEND BACK
PISTON
RELAY PISTON
RELAY PISTON
SPRING
(IF USED)
RESERVOIR
SUPPLY PORT
FIGURE 3 - SECTIONAL AT-1DC
2
™
ANTILOCK TRACTION ASSY.
™
family of relay valves
™
™
™
, R-14
, BP-R1
, AR-1
& ATR-1
TRACTION CONTROL SOLENOID
EXHAUST PORT
INLET-EXHAUST
VALVE
™
ANTILOCK TRACTION ASSEMBLY
OPERATION
GENERAL
While the ATR-1DC
its true function is that of an air brake relay valve. Because
the ATR-1DC
™
control function, the following description of operation
describes its operation as a relay valve and its function in
the traction control system. The full operation of the
antilock system and separate antilock components and their
operation is not addressed in this publication. For a
description of antilock operation, refer to the appropriate
Service Data Sheet covering the electronic controller used
with the ATR-1DC
electronic controller, or SD-13-4788 for the EC-17
controller). Other useful information on antilock system
components may be downloaded from www.bendix.com. For
example: SD-13-4793 (M-21
™
modulators), SD-13-4870 (M-32
modulators), SD-13-4754 (WS-20
and SD-13-4860 (WS-24
SERVICE BRAKES - APPLYING
™
Reservoir air pressure is present at the supply port (SUP)
and at the relay inlet and exhaust valve. Reservoir air
pressure also flows from the supply port through internal
SECONDARY
SERVICE PORT
PRIMARY
SERVICE PORT
CHECK VALVES
DELIVERY
PORT
WHEEL SPEED
SENSOR
™
valve is an antilock-traction relay valve
is essentially a relay valve, with a traction
™
valve (e.g. SD-13-4785 for the EC-16
™
and M-22
™
and M-32QR
™
wheel speed sensors),
™
wheel speed sensors).
BRAKE VALVE
(SHOWING
DELIVERY AIR
LINES ONLY)
DOUBLE
CHAMBER
TONE RING
™
™
electronic
™
antilock
™
antilock
AIR BAG
BRAKE
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