BENDIX QRV QR-1 QUICK RELEASE VALVES Service manual

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SD-03-901
DESCRIPTION
The function of the quick release valve is to speed up the
exhaustofairfromtheairchambers.Itismountedcloseto
the chambers it serves. In its standard configuration the
valveisdesignedtodeliverwithin1psiofcontrolpressureto
thecontrolleddevice;however,forspecialapplicationsthe
valveis availablewithgreater differentialorzero hysteresis.
QR-1™valvesalsocome with optional noise reducingfoam
crosses or silencers.
Reference Figure 1, two styles of quick release valves are
available and are functionally the same; the QRV™valve,
which is of older design and utilizes a spring and spring
seat,and the QR-1™valve, which in itsstandardconfigura-
tion does not employ a spring or spring seat.
(Note: QR-1™valves with a pressure differential employ a
springandspringseat.)
Porting consists of one supply port, two delivery ports and
oneexhaustport.
OPERATION
When a brake application is made, air pressure enters the
supply port; the diaphragm moves down, sealing the
exhaust. Atthe same time,airpressure forces theedgesof
thediaphragmdown and air flows out the delivery ports.
Whenairpressurebeingdelivered(beneath thediaphragm)
equalsthepressurebeingdeliveredbythebrakevalve(above
the diaphragm), the outer edge of the diaphragm will seal
against the body seat. The exhaust port is still sealed by
the center portion of the diaphragm when the supply air is
released;the air pressure abovethediaphragm is released
backthrough thebrakevalve exhaust;airpressure beneath
the diaphragm forces the diaphragm to rise, opening the
exhaust,allowingdeliveryairtoexhaust.
FIGURE 1
Bendix®QRV™and QR-1™Quick Release Valves
QR-1™Quick Release Valve
QRV™Quick Release Valve
Supply Port
DeliveryPort
DeliveryPort
Exhaust Port
O-Ring Cover
Spring
Supply Port
Delivery
Port DeliveryPort
O-Ring
Cover
Body QR-1™Quick
ReleaseValve
Diaphragm
QRV™Quick
ReleaseValve
Exhaust Port
Diaphragm

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PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performinganyintrusivemaintenanceprocedures.Awarranty
maybe voided ifintrusivemaintenance is performedduring
thewarranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuableguide indetermining thebestmaintenance interval
for air brake system components.At a minimum, the QR-1™
valveshouldbeinspectedevery12monthsor3600operating
hours,whichevercomes first, for proper operation. Should
the QR-1™valve not meet the elements of the operational
testsnotedinthisdocument,furtherinvestigationandservice
ofthe valvemaybe required.
OPERATING AND LEAKAGE TESTS
Whileholding a foot brakevalveapplication:
1. Coatthe exhaust port withasoapsolution; leakage of a
1" bubble in 3 seconds is permitted.
2. Coatthebodyandcoverwithasoapsolution.Noleakage
ispermitted between body and cover.
If the valve does not function as described, or if leakage is
excessive,it is recommendedthatit be replacedwitha new
orremanufacturedunit,orrepairedwithgenuineBendixparts.
GENERAL SAFETY GUIDELINES
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.
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 inoperation, EXTREMECAUTION 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. Useonly the proper tools and 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,make certain todrain the airpressure 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, deactivatethe 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.
11. For vehicles with Antilock Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lampshould be ON)prior to performingany vehicle
maintenance where one or more wheels on a drive
axle are lifted off the ground and moving.
REMOVING AND INSTALLING
REMOVING
Block vehicle wheels and/or hold vehicle by means other
thanairbrakes.
Drainallairbrakesystemreservoirs.
Disconnectair lines fromvalve.
Removemounting bolts,then valve.

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INSTALLING
Mount the valve with exhaust port pointing down; securely
tightenmountingbolts.
Connecttheairlines to valve (brake valve application line to
top port; brake chamber line to side ports.)
DISASSEMBLY
QRV™VALVE
1. Usinga wrenchonsquareportionofexhaustport,remove
thecover.
2. Removethe spring, springseatand diaphragm. Remove
thecover o-ring.
QR-1™VALVE
1. Removethe fourscrews.
2. Removethe spring and spring seat (if soequipped).
3. Removethe diaphragm.
4. Removethe covero-ring.
CLEANING AND INSPECTION
Clean all metal parts in mineral spirits. Wipe all rubber parts
clean.
It is recommended that all rubber parts and any other part
showing signs of wear or deterioration be replaced with
genuineBendix parts.
ASSEMBLY
QRV™VALVE
1. Positionthespringseatoverthediaphragmandtheninstall
it into body.
2. Installthe spring and cover o-ring.
3. Installthecover;tighten securely.(Torqueto150-400inch
pounds.)
QR-1™VALVE
1. Ifthevalve is equipped within spring and springseat:
a. Position the spring in body.
b. Positionthe diaphragm over spring seat.
c. Install the o-ring in the cover groove;installthecover
and tighten the screws evenly and securely. (Torque
to30-60inch pounds.)
2. Ifthevalveis not equipped with spring and spring seat:
a. Installthe diaphragm.
b. Installtheo-ring in the cover groove; install thecover
andtighten thehscrewsevenly andsecurely.(Torque
to30-60inch pounds.)
3. Performtestsasoutlinedin“OperatingandLeakageTests”
section.

4BW1442 © 2006 Bendix Commercial Vehicle Systems LLC. All rights reserved. 7/2006 Printed in U.S.A.