BENDIX QR-L INLINE QUICK RELEASE VALVE User manual

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FIGURE 1 - QR-L™INLINE QUICK RELEASE VALVE
SD-03-906
Bendix®QR-L™Inline Quick Release Valve
DESCRIPTION
TheBendix®QR-L™quickreleasevalveissimilartostandard
quick release valves such as the QR-1™, QR-N™, and
QRN-2™.Itspurpose isto “speedup”the releaseofair from
air lines and devices it is attached to. Although primarily
intended to enhance air system performance by rapidly
exhausting supply or control air pressure from vehicle air
lines, it can be used in a variety of different applications. It
is uniquely suitable as an air system performance
enhancementduetoits0 psicrackanddifferentialpressure.
Supplyanddelivery pressureisthe samethroughoutthe air
pressure range. A typical air system application for the
QR-L™valveis illustratedin figure3.
TheQR-L™valveisnon-serviceable. Itincorporates asingle
supplyand deliveryport alongwith twoexhaust ports. Two
versions of the QR-L™valve are available as illustrated in
figure1. Male pipethreads atthe supply port,on thedirect
mount version, allow installation in another air device. A
1-1/8”machine threadonthe exteriorofthe supplyportand
a 3/8” PT female air connection on the second version
permits installation in a bracket or a hole in a frame or
cross member on the vehicle.
Anarrow, embossedin thecast body,indicates theflow of
airthrough thevalve, fromsupply to delivery.
Supply port: 1/2"-Male P.T. or 3/8"-Female P.T.
Delivery ports: 1/2" Female P.T.
Weight: .6 lb.
Material: Die cast zinc
Operating pressure: 150 psi maximum
Operatingtemperature: -40° to 200°F
FIGURE 2 - QR-L™INLINE QUICK RELEASE VALVE
O-RING
3 AIR CHANNELS
(0 PSI CRACK &
DIFFERENTIAL)
CAP
SUPPLY
PORT
BODY
CRIMPED TO
CAP BODY
DELIVERY
PORT
DIAPHRAGM
EXHAUST
DIAPHRAGM
EXHAUST EXHAUST
DELIVERY
PORT DELIVERY
PORT
NUT & STAR
WASHER
SUPPLY PORT
(FEMALE PIPE
THREAD)
SUPPLY PORT
(MALE PIPE
THREAD)
Direct Mount QR-L™Valve Frame or Bracket Mount QR-L™Valve
WRENCH
FLAT
WRENCH
FLAT

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OPERATION
0 psi Crack & Differential Pressure
Unlike standard quick release valves, the QR-L™valve
maintains the same pressure at the supply and delivery
ports (0 psi crack and differential) throughout the entire
pressurerangeduringbothapplyandreleasemodes. Three
radial channels in the cap, along with a specially shaped
diaphragm,provide theQR-L™valve withthis feature.
Apply
When air pressure enters the supply port, it causes the
center portion of the diaphragm to seal the exhaust in the
body. Supplyairpressure simultaneouslyforcesthe edges
ofthe diaphragmawayfrom itsseat onthecap, allowingair
toflow freely outthe deliveryport. Delivery pressureis the
same as supply pressure.
Balance
Whendelivery air pressure(pressure beneathdiaphragm)
is equal to supply air pressure above the diaphragm, the
outer edges of the diaphragm seat against the cap. The
exhaustremainssealedbecause airpressurebearsagainst
the center portion of the diaphragm from one side only.
Release
When air pressure is removed or reduced rapidly at the
QR-L™valve supply port, the air pressure on the delivery
sideofthediaphragm holdstheouteredgeof thediaphragm
against its seat on the cap while simultaneously moving
the center portion away from the exhaust port in the body.
Air from the delivery port flows out the exhaust ports. If air
pressure is reduced slowly at supply port, air may not flow
out the exhaust ports.
Whendeliveryairpressureis fullyexhausted,thediaphragm
will return to its natural state, with its outer edges seated
onthecapandthe centerportionseatedagainsttheexhaust
in the body.
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO AVOID
PERSONAL INJURYOR 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.
FIGURE3 TYPICALQR-L™INLINEQUICKRELEASE VALVE
AIRSYSTEMAPPLICATION
FIGURE5QR-L™INLINE QUICKRELEASEVALVE BALANCED
MODE
Diaphragm
Supply
Delivery
Exhaust
Exhaust
Diaphragm
Supply
Delivery
Exhaust
Exhaust
FIGURE6QR-L™INLINE QUICKRELEASEVALVERELEASE
MODE
Diaphragm
Supply
Delivery
FIGURE4QR-L™INLINEQUICKRELEASE VALVEAIRAPPLIED
TOSUPPLYPORT
Exhaust
Exhaust
Trailer
SupplyValve
Trailer
Control
Valve
Tractor
Protection
Valve
Service
Brake
Valve Control
Line QR-L™
Valve
Supply Line
QR-L™
Valve

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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
enginebe in operation, EXTREMECAUTIONshould
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. Useonly the propertoolsand observe
all precautions pertaining to use of those tools.
4. If the work is being performed on the vehicle’s air
brake system, or any auxiliary pressurized air
systems,makecertaintodrain 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
recommendedprocedures, 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®replacement parts,
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically 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 specifically 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.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performinganyintrusivemaintenanceprocedures.Awarranty
maybe voidedifintrusive maintenanceisperformed during
thewarranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuableguidein determiningthebestmaintenance interval
for air brake system components.At a minimum, the QR-L™
valveshouldbeinspectedevery12monthsor3600operating
hours,whichever comes first,for properoperation. Should
the QR-L™valve not meet the elements of the operational
testsnotedinthisdocument,furtherinvestigationandservice
ofthevalve mayberequired.
SERVICE CHECKS
1. Remove any accumulated contaminants. Visually
inspectthevalve’sexteriorforphysicaldamage. Replace
thevalve ifexcessive physicaldamage isnoted.
2. Inspect all air lines connected to the valve for signs of
wear or physical damage. Repair or replace as
necessary.
OPERATIONAL AND LEAKAGE TESTS
1. Block the vehicle’s wheels and fully charge the air
system.
2. ApplyandreleaseairpressurerapidlytotheQR-L™valve
severaltimes andcheck forprompt response.
3. With air pressure applied to the supply port, apply a
soapsolutiontotheQR-L™valveexhaustports. Leakage
of a 1” bubble in 5 seconds is permissible.
4. With the brakes still applied to the supply port, apply a
soapsolution aroundthe valvewherethe capand body
are joined. No leakage at this point is permitted.
If the valve does not function as described, or if leakage is
excessive, replace it at any authorized parts outlet.
REMOVAL
1. Identify and mark or label all air lines and their
connections to the QR-L™valve. Then disconnect the
air lines. Use the QR-L™valve wrench flat, closest to
theair lineor fittingbeing removed.
2. Remove the QR-L™valve from the vehicle. Retain the
mountinghardware, ifany.
INSTALLATION
1. InstalltheQR-L™valve onthevehicleusing themounting
hardware,ifany, savedduringremoval.
2. Reconnectallairlinesto thevalve usingthe identification
madeduring removal. Note:An arrowembossed inthe
body of the vale indicates the direction of air flow and
points toward the delivery port. Use the QR-L™valve
wrenchflat,closesttothe airlineorfittingbeinginstalled.
3. Test all air fittings for excessive leakage and tighten as
needed. Perform OPERATIONAL AND LEAKAGE
TESTSbefore placingthe vehiclebackinto service.
NOTE: The construction of the QR-L™valve prevents
disassembly/assembly. It is a non-serviceable device
and cannot be repaired. If the QR-L™valve does not
meet the operational and leakage tests, it must be
replaced. Replacements are available at any
authorized Bendix parts outlet.

4BW1808 © 2004 Bendix Commercial Vehicle Systems LLC All rights reserved. 3/2004 Printed in U.S.A.