Normal Service Application - BENDIX SR-1 SPRING BRAKE VALVE Manual

DOUBLE
CHECK
VALVE
FIGURE 5 - SYSTEM FULLY CHARGED
DOUBLE
CHECK
VALVE
FIGURE 6 - NORMAL SERVICE APPLICATION
OPERATION - NORMAL SERVICE
RESERVOIRS 1 & 2 CHARGED
When a service application is made by actuating the dual
brake valve, air from the No. 2 delivery circuit is delivered
from the brake valve to the control port, and is stopped at
the closed inlet of valve A. No movement of the internal
components of the SR-1
No. 1 delivery circuit of the dual brake valve actuates the
service section of the spring brake actuators.
#2 SERVICE
RESERVOIR
#1 SERVICE
RESERVOIR
PARK
CONTROL
#2 SERVICE
RESERVOIR
#1 SERVICE
RESERVOIR
PARK CONTROL
™ valve takes place. Air from the
PISTON A
INLET &
EXHAUST A
INLET &
EXHAUST
B
SB-3
PISTON A
INLET &
EXHAUST A
INLET
&
EXHAUST
B
SB-3
OPERATION - SERVICE APPLICATION WITH
LOSS OF NO. 2 RESERVOIR PRESSURE
In the event air pressure is lost in the No. 2 reservoir, the No.
1 reservoir and the parking control valve will be protected via
the double and single check valves in the air system. A
service application of the foot brake valve in this situation
results in little or no air being delivered from the No. 2 delivery
circuit to the control port of the SR-1
™
of the SR-1 valve internal components takes place. Braking
is assured because the No. 1 service reservoir is protected
by a check valve and the No. 1 delivery circuit of the dual
PISTON B
CHECK VALVE
EXHAUST
PISTON B
CHECK VALVE
EXHAUST
™
valve. No movement
3