BENDIX SV-3 Manuel - Page 3

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AUTOMATIC (self actuating at a pre-set pressure)

There are two methods for accomplishing automatic operation

of an SV valve.

1. One method for affecting automatic operation is to

connect the SV valve control port to its supply port using

a pipe or tubing tee. This is referred to as "common

control and supply" since the pressure at the supply

and control port is the same.

With common control and supply, the valve opens

(delivers air) on ascending supply air pressure and closes

and exhausts on descending pressure. The pressure at

which delivery and exhaust occurs differs for various part

numbers. Opening and exhaust pressure is specified

for the various part numbers.

2. SV valves can be made to operate automatically even

when the supply port and control ports are separate (not

connected as described in #1 above).

The SV valve will open (deliver air) and close (and

exhaust) when control port pressure is increased or

decreased. Consult Bendix Engineering for specific

control port pressure for valve opening and closing when

this type of automatic operation is used. When using

the SV-1

synchro valve in this manner, the control signal

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ramp rate should be limited by orificing or other methods.

Please contact Bendix Engineering with specific

application requirements.

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 SV

valves should be inspected every 6 months or 1500 operating

hours, whichever comes first, for proper operation. Should

the SV valves not meet the elements of the operational tests

noted in this document, further investigation and service of

the valve may be required.

If the SV-1

, SV-3

, or SV-4

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described or leakage is excessive, it should be repaired or

replaced with a genuine Bendix unit, available at any

authorized parts outlet.

WARNING! PLEASE READ AND FOLLOW

THESE

INSTRUCTIONS

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.

valve fails to function as

™

AVOID

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.

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

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, 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

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.

vehicle

manufacturer's

replacement parts,

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