BENDIX SR-7 SPRING BRK MODULATING VALVE Manual, Applications

2, 2 OPERATION The operation guidelines shown in this manual represent the relay valve based SR-7 ™ (refer to system schematic shown in figure 3). A quick release based valve functions similarly to the relay valve based version with the exception PARK CONTROL PORT SUPPLY PORT INLET / EXHAUST VAL…

5, 5 NORMAL SERVICE APPLICATION (FIGURE 7) During a service brake application, the valve remains in the lap position. The 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 p…

4, 4 CHARGING SPRING BRAKE ACTUATORS BELOW 107 PSI (FIGURE 5) With the air brake system charged and the parking brakes released (by pushing the dash valve button in), air enters the park control port. This opens the SR-7 ™ valve to supply air pressure to the spring brake chambers. As illustr…

1, BENDIX SR-7 SPRING BRK MODULATING VALVE 1 ® Bendix ® SR-7 ™ Spring Brake Modulating Valve SD-03-9043 DESCRIPTION The Bendix ® SR-7 ™ spring brake modulating valve is used in conjunction with a dual air brake system and spring brake actuator and performs the following functions: 1. Provides a rapid applicatio…

7, 7 ANTI COMPOUNDING (FIGURE 11) The SR-7 ™ valve provides anti-compounding of the service and spring brake forces. When the park brakes are actuated (by pulling the dash valve button out), a service brake application will cause the SR-7 ™ valve to deliver air pressure to the spring brake cham…

6, 6 à SERVICE APPLICATION WITH LOSS OF AIR IN PRIMARY CIRCUIT (FIGURE 9) With the parking brakes released (dash valve button in) and the absence of air in the primary circuit delivery, a service brake application from the secondary circuit causes the pressure in the spring brakes to be …