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BALANCE
The air pressure being delivered by the open inlet valve
also is effective on the bottom area of the relay piston.
When air pressure beneath the piston equals the service
air pressure above, the piston lifts slightly and the inlet
spring returns the inlet valve to its seat. The exhaust
remains closed as the service line pressure balances the
delivery pressure. As delivered air pressure is changed,
the valve reacts instantly to the change, holding the brake
application at that level.
EXHAUST OR RELEASE
When air pressure is released from the service ports, air
pressure in the cavity above the relay piston is exhausted
through the primary circuit of the brake valve. At the same
time, air pressure beneath the piston lifts the relay piston
and the exhaust seat moves away from the exhaust valve,
opening the exhaust passage. With the exhaust passage
open, the air pressure in the brake chambers is then
permitted to exhaust through the exhaust port, releasing
the brakes.
Figure 5 – Bendix
R-12DC
®
4
BRAKES
APPLIED
Valve Applied Position (Showing Biased Double-Check Operational Views)
®
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A
warranty may be voided if intrusive maintenance is
performed during the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for air brake system components. At a minimum, the valve
should be inspected every 6 months or 1500 operating
hours, whichever comes first, for proper operation. Should
the valve not meet the elements of the operational tests
noted in this document, further investigation and service
of the valve may be required.
BRAKE PEDAL
APPLIED
BRAKE PEDAL
APPLIED
NORMAL: BIASED
DOUBLE-CHECK VALVE-
PRIMARY
CONTROL LINE SUPPLIES
RELAY PISTON
CONTROL LINE
FAILURE
BRAKE PEDAL
APPLIED
SECONDARY
CONTROL LINE
SUPPLIES RELAY
PISTON