BENDIX R-12DC Сервісні дані - Сторінка 4

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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

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