BENDIX SR-1 SPRING BRAKE VALVE Handbuch - Seite 5

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DOUBLE

CHECK

VALVE

FIGURE 9 - PARK APPLICATION

OPERATION - PARKING

If both systems #1 and #2 are intact and the park control

valve is placed in the "park" or exhaust position, the SR-1

valve supply of air pressure and the air pressure in the spring

brake actuator cavities is exhausted. The single check valve

in the SR-1

™

valve assists this exhaust of air pressure by

allowing the air below piston B to flow back out the open

exhaust of the park control valve. When air pressure below

piston B has dropped sufficiently, piston B moves down,

opening the inlet of valve B and providing an additional

exhaust passage for air exhausting through the SR-1

from the spring brakes.

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 SR-1

valve should be inspected every 6 months or 1500 operating

hours, whichever comes first, for proper operation. Should

™

the SR-1

valve not meet the elements of the operational

tests noted in this document, further investigation and service

of the valve may be required.

SERVICE CHECKS

OPERATING CHECKS

Block all wheels and hold by means other than vehicle brakes.

Charge air brake system to governor cut-out pressure.

#2 SERVICE

RESERVOIR

#1 SERVICE

RESERVOIR

INLET &

EXHAUST A

PARK

CONTROL

™

valve

™

PISTON A

INLET &

EXHAUST

SB-3

1. Place parking control valve in the "park" position. Observe

that the spring brake actuators apply promptly. In the

delivery port of the valve install a test gauge known to be

accurate. Place the parking control valve in the "release"

position. Observe that the spring brake actuators release

fully.

2. With the parking control valve in the "release" position,

note the gauge pressure reading. (Check the vehicle

manual for the correct spring brake actuator hold-off

pressure.) If the pressure reading is incorrect, the valve

must be repaired or replaced.

3. Place the parking control valve in the "park" position, the

gauge reading should drop to zero promptly. A slow

release of pressure may indicate faulty operation of the

single check valve (within the modulating valve.)

4. Place the parking control valve in the "release" position.

Locate the number one service reservoir and drain it

completely.

Apply the foot brake valve several times and note that

the pressure reading on the gauge decreases each

time the foot brake valve is applied. After several

applications, pressure on the gauge will drop to the point

where release of the spring brake actuators will no

longer occur.

LEAKAGE CHECK

With the air system fully charged and the parking control

valve in the "release" position, coat the exhaust port and

around the valve corner with a soap solution. Slight leakage

is permitted.

If the SR-1

™

spring brake valve does not function as described

above, or leakage is excessive, it is recommended that it be

repaired or replaced with a genuine Bendix service

replacement valve.

PISTON B

CHECK VALVE