BENDIX QR-N Manual - Página 2

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RELEASE

When air pressure is reduced or removed from the QR-N

valve supply port, the air pressure on the delivery side

of the diaphragm is greater than that on the supply side.

The higher delivery side pressure holds the outer edge of

the diaphragm against the upper body sealing lip while

simultaneously moving the center portion away from the

exhaust port. Air from the delivery ports ﬂ ows out the

exhaust. When air pressure on the delivery side of the

diaphragm equals the pressure on the supply side, the

center portion of the diaphragm moves into contact with

the exhaust port.

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,

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the QR-N

valve should be inspected every 12 months

or 3600 operating hours, whichever comes ﬁ rst, for

proper operation. Should the QR-N

elements of the operational tests noted in this document,

further investigation and service of the valve may be

required.

GENERAL SAFETY GUIDELINES

WARNING! PLEASE READ AND FOLLOW

THESE INSTRUCTIONS TO AVOID PERSONAL

INJURY OR DEATH:

When working on or around a vehicle, the following

general precautions should be observed at all times.

1. Park the vehicle on a level surface, apply the parking

brakes, and always block the wheels. Always wear

safety glasses.

2. Stop the engine and remove ignition key when

working under or around the vehicle. When working

in the engine compartment, the engine should be

shut off and the ignition key should be removed.

Where circumstances require that the engine be

in operation, EXTREME CAUTION should be used

to prevent personal injury resulting from contact

with moving, rotating, leaking, heated or electrically

charged components.

3. Do not attempt to install, remove, disassemble

or assemble a component until you have read

and thoroughly understand the recommended

procedures. Use only the proper tools and observe

all precautions pertaining to use of those tools.

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valve not meet the

4. If the work is being performed on the vehicle's

air brake system, or any auxiliary pressurized air

systems, make certain to drain the air pressure from

all reservoirs before beginning ANY work on the

vehicle. If the vehicle is equipped with an AD-IS

air dryer system or a dryer reservoir module, be

sure to drain the purge reservoir.

5. Following the vehicle manufacturer's recommended

procedures, deactivate the electrical system in a

manner that safely removes all electrical power

from the vehicle.

6. Never exceed manufacturer's recommended

pressures.

7. Never connect or disconnect a hose or line

containing pressure; it may whip. Never remove a

component or plug unless you are certain all system

pressure has been depleted.

8. Use only genuine Bendix

components and kits. Replacement hardware,

tubing, hose, ﬁ ttings, etc. must be of equivalent

size, type and strength as original equipment and

be designed speciﬁ cally for such applications and

systems.

9. Components with stripped threads or damaged

parts should be replaced rather than repaired. Do

not attempt repairs requiring machining or welding

unless speciﬁ cally stated and approved by the

vehicle and component manufacturer.

10. Prior to returning the vehicle to service, make

certain all components and systems are restored

to their proper operating condition.

11. For vehicles with Antilock Traction Control (ATC),

the ATC function must be disabled (ATC indicator

lamp should be ON) prior to performing any vehicle

maintenance where one or more wheels on a drive

axle are lifted off the ground and moving.

OPERATING AND LEAKAGE TESTS

1. Apply 100 psi (689 kPa) air pressure to the supply port

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of the QR-N

valve and note that the device connected

to the QR-N

™

valve responds promptly.

2. With 100 psi (689 kPa) air pressure applied to the

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QR-N

valve SUPPLY port apply a soap solution to the

exhaust port and around the junction of the upper and

lower body halves.

A. No leakage is permitted between the body halves.

B. Leakage of greater than a 1" (25.4 mm) bubble in 3

seconds at the exhaust port is unacceptable.

3. Release the air pressure at the supply port and note

that the device connected to the QR-N

promptly and returns to a zero air pressure condition.

replacement parts,

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valve responds