Bendix Commercial Vehicle Systems SR-7 SPRING BRK MOD VLV 1/11 - Manual (Page 5)

5
NORMAL SERVICE APPLICATION (FIGURE 7)
During a service brake application, the valve remains in
the lap position. The Bendix
® SR-7 ® valve monitors the
presence of air pressure in both primary and secondary
delivery circuits.
FIGURE 7 - NORMAL SERVICE APPLICATION
PARKING (FIGURE 8)
Actuating the park brakes (by pulling the dash valve button
out) exhausts spring brake air pressure through the SR-7
®
valve exhaust port.
FIGURE 8 - PARKING
INLET VALVE SEATED
SECONDARY RESERVOIR
CONSTANT PRESSURE
CONTROL LINE PRESSURE
AIR EXHAUSTS FROM
SPRING BRAKES
CONTROL PORT
MAIN AND CONTROL PISTONS MOVE UP
BALANCE PORT
SECONDARY RESERVOIR
CONSTANT PRESSURE
CONTROL LINE PRESSURE
BALANCE PORT - PRIMARY
CIRCUIT PRESSURE
CONTROL PORT - SECONDARY
CIRCUIT PRESSURE
INLET / EXHAUST VALVE SEATED
DELIVERY TO SPRING BRAKES