BENDIX TW-1 Manuel - Page 2

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OPERATION

Reference Figure 2, the LQ-2

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valve and the TW-1

control valve are connected to a service

application line: one connection is to the supply (top) port of

the limiting and quick release valve; the other is to the inlet

port of the two-way control valve. The delivery line from the

two-way control valve is connected to the cut-out valve (side)

port of the limiting and quick release valve.

DRY ROAD POSITION

With the handle of the TW-1

position, the valve is in the "on" position and air is permitted

to pass through the valve.

When a foot brake valve application is made, air flows through

the TW-1

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control valve and enters the side port of the limiting

and quick release valve. At the same time, air also enters

the top inlet port; thus pressure acts upon the top and side

areas of the piston, moving the piston down, seating the

exhaust valve, closing the exhaust port. At the same time

the inlet valve opens and air is delivered out the delivery

ports, to the chambers.

When the air pressure beneath the piston (and in the

delivery lines) equals the air pressure being delivered by

the foot valve, the piston raises slightly and closes the inlet

valve. When the foot valve application is released, the air

on the top and side areas of the piston is exhausted back

through the foot valve; air pressure beneath the piston raises

it, and the exhaust valve opens allowing the air in the delivery

lines to exhaust out the exhaust port.

SLIPPERY ROAD POSITION

With the handle of the TW-1

Road" position, the valve is in the "off" position; the inlet

valve is seated and the exhaust is open. In this position air

is not permitted to pass through the valve.

When a foot brake application is made, air enters only the

top inlet port. (Air does not enter the side inlet port because

the TW-1

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control valve is "off".) Air pressure is effective

only on the upper inner area of the piston; the piston moves

down and the exhaust valve seats and the inlet valve opens.

Air pressure in the delivery line acts on the lower area of the

piston, which is about twice the size of the upper inner area

of the piston. Thus, when the pressure acting upon the lower

area is about half of the brake valve delivered pressure, the

piston lifts and closes the inlet valve. In this position, the air

pressure in the brake chambers is approximately 50% of

brake valve application pressure.

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limiting and quick release

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control valve in the "Dry Road"

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control valve in the "Slippery

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.

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.

AVOID

vehicle

manufacturer's

replacement parts,

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