BENDIX DV-2 AUTO RESERVOIR DRAIN VALVE User manual

DESCRIPTION

The DV-2™automatic reservoir drain valve ejects moisture

andcontaminantsfromthereservoirinwhichitisconnected.

Itoperatesautomaticallyandrequiresnomanualassistance

or control lines from other sources.

Theautomaticreservoirdrainvalvehasadiecast aluminum

bodyandcoverandisnormallymountedeitherinthebottom

ofthe reservoir usingthe top portof the drainvalve or inthe

endofanenddrainreservoirusing the side portofthevalve.

TheDV-2™valveisalsoavailablewithaheaterandthermostat

cast into the cover for vehicles operated in subfreezing

temperatures.The heated DV-2™valveissupplied ineither

a12or24voltmodelandinbottomorenddrainconfiguration.

A 1/4" male pipe adapter is supplied with all DV-2™drain

valves,enddrainandbottomdrain,bothstandardandheated.

This adapter should be installed directly into the reservoir.

Early versions included a filter screen in the adapter. The

filtershouldbediscarded.Laterversionsmayhaveastandard

pipe nipple instead of the adapter.

SD-03-2501

Bendix®DV-2™Automatic Reservoir Drain Valve

STANDARD DV-2™

VALVE DV-2™VALVE WITH

HEATER

DV-2™VALVE WITH HEATER AND THERMOSTAT

ADAPTER

BODY

TOP

RESERVOIR

PORT

SIDE

RESERVOIR

PORT

INLET &

EXHAUST

VALVE

THERMOSTAT

HOUSING

HEATER ELEMENT

COVER

EXHAUST

PORT

WIRE STEM

ELECTRICAL

LEADWIRE

VALVE

GUIDE

SEALING

RING

FIGURE 3 FIGURE 4

FIGURE 1 FIGURE 2

NOTE: If a vehicle equipped with a DV-2™automatic drain

valve(s)isoperated insubfreezingtemperatures,it

isrecommendedthataheatedreservoirdrain valve

is installed.

OPERATION

ReferringtoFigure 1, withnoairpressure inthesystem,the

inlet and exhaust valves are closed. Upon charging the

system, a slight pressure opens the inlet valve (Figure 2)

which permits air and contaminants to collect in the sump.

Theinletvalveremains open whenpressureisascendingin

the system until maximum (governor cutout) pressure is

reached. The spring action of the valve guide in the sump

cavityclosesthe inlet valve.Theinlet valve andtheexhaust

valvearenow closed (Figure3).

Whenreservoirpressuredropsslightly(approximately2psi),

air pressure in the sump cavity opens the exhaust valve

(Figure 4) and allows moisture and contaminants to be

ejected from the sump cavity until pressure in the sump

cavity drops sufficiently to close the exhaust valve.

The length of time the exhaust valve remains open and the

amountofmoistureandcontaminantsejecteddependsupon

the sump pressure and the reservoir pressure drop that

occurs each time air is used from the system.

Manual draining can be accomplished as follows:

Using a tool, move the wire in the exhaust port upward,

holding it in until draining is completed.

Thethermostaton the heatedmodelDV-2™automaticdrain

valvewill activate theheating element whenthevalve body

reaches a temperature of approximately 45°F and will

deactivate the heating element when the valve body is

warmed to approximately 85°F.

PREVENTIVE MAINTENANCE

Important: Review the Bendix Warranty Policy before

performinganyintrusivemaintenanceprocedures.Awarranty

maybevoided ifintrusivemaintenance is performedduring

thewarranty period.

No two vehicles operate under identical conditions, as a

result, maintenance intervals may vary. Experience is a

valuableguideindetermining the bestmaintenanceinterval

for air brake system components. At a minimum, the

automaticreservoirdrain valve shouldbeinspectedevery 6

monthsor 1500 operatinghours, whichever comesfirst, for

properoperation.Shouldtheautomaticreservoirdrainvalve

not meet the elements of the operational tests noted in this

document,furtherinvestigationandserviceofthevalve may

berequired.

Upon investigation, parts showing signs of wear or

deteriorationshouldbe replaced.

If there is a filter screen in the adapter fitting it should be

removedanddiscarded.

SERVICE CHECKS

OPERATING TEST

Withsystem charged, makeseveral footvalveapplications

and note each time an application is made, an exhaust of

air occurs at the exhaust port of the drain valve. If no air

comes out, push the wire stem. If no air comes out, there

maybeapluggedfilterintheadapterwhichshouldberemoved

anddiscarded.

LEAKAGE TEST

With system charged and pressure stabilized in system,

thereshouldbenoleaksatthedrainvalveexhaust.Aconstant

slight exhaust of air at the drain valve exhaust could be

caused by excessive leakage in the air brake system.

If the DV-2™automatic drain valve does not function as

described or if leakage is excessive, it is recommended

that it be replaced with a new or remanufactured unit or

repairedwith genuine Bendixparts.

INSTALLING AND REMOVING

REMOVING

Blockandholdvehiclebymeansotherthanairbrakes.Drain

air system.

Disconnect heater wire if valve is so equipped. Remove

automaticreservoirdrainvalve.

DISASSEMBLY

Remove4capscrewsandlockwashers. Remove cover and

sealingring.

NOTE: Theheater andthermostat of theDV-2™valve’s so

equipped are not serviceable. If the heater or

thermostat has failed, the entire cover must be

replaced.Donotremove thethermostatcoverplate.

It is moisture sealed and removal could result in

earlythermostat failure.

Removevalveguide.

Removeinletandexhaustvalve.

Removeadapter and filterassembly (iffilterpresent).

Removefilterretainer (if any).

Removefilter(if any).

INSTALLING

Blockandholdvehiclebymeansotherthanairbrakes. Drain

air system.

To avoid early fouling at the DV-2™valve, thoroughly finish

andcleanthe reservoirbeforeinstallingthe drainvalve.

Aerate any tank thoroughly if any solvents have been used

in the cleaning process.

IMPORTANT

Wheninstalling a DV-2™drainvalveequipped with aheater

andthermostat,first determineifthevehicleelectricalsystem

is 12 or 24 volt, and that the heater/thermostat unit is of the

samevoltage.The #14 gaugeleadwire on thevalveshould

be connected to the “on” position of the engine control or

ignition switch. Use an 8 amp fuse for one valve, a 15 amp

fuse for two valves, and a 20 amp fuse for three valves.All

electrical connections must be waterproof.

CLEANING AND INSPECTION

Cleaningsolventmay be usedonmetalparts. Rubberparts

should be wiped clean.

Inspectallpartsforwearordeterioration.Discardfilterscreen

ifpresent.

Replace all parts not considered serviceable during these

inspections.

Bendix Field Maintenance Kit 282134 contains all parts

necessaryfor servicingall models ofthe DV-2™valve.

ASSEMBLY

Beforeassembling thevalve, applya lightfilm ofgrease on

inletvalveseat.

DONOTAPPLYOILTOTHEINLETANDEXHAUSTVALVE.

Placesealing ring ingrooveof cover.

Placevalveguideover inletandexhaustvalve.

Placevalveguideandinletandexhaustassemblyintocover

(wire will project through exhaust port).

Placebodyoncoverandinstallcapscrewsandlockwashers.

Installadapter orpipe nipplein appropriateport.

Install drain valve in reservoir and reconnect heater wire if

drainvalveis so equipped.

NOTE: Coversonthe standardandheateddrainvalvescan

beinterchanged.

TESTING REBUILT AUTOMATIC RESERVOIR DRAIN

VALVE

Perform“OperatingandLeakageChecks”asoutlined in this

section.

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

enginebeinoperation,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. Useonlythepropertoolsand 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 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®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

notattempt 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

lampshouldbe ON) prior to performing any vehicle

maintenance where one or more wheels on a

drive axle are lifted off the ground and moving.

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