BENDIX TW-1-3-4-5-6 CONTROL VALVES Manuale utente

SD-03-3602

Bendix®TW-1™, TW-3™, TW-4™, TW-5™& TW-6™Control Valves

FIGURE 1 TW-1™CONTROL VALVE

1/8” P.T.

SUPPLY

SCREW

1/8” P.T.

DELIVERY

(2 PORTS)

.28” DIA.

2 HOLES-1.88”

APART

1/4" P.T.

DELIVERY

PORTS (2)

FIGURE 2 - TW-3™CONTROL VALVE

REVERSED LEVER

POSITION

LEVER

DIAL

PANEL

THICKNESS

.06 OR LESS

PLUNGER

SEAL

#10-24

THD.

(2 HOLES)

EXHAUST

LEVER

VALVE SPRING

SUPPLY

CAP NUT

37.5°

PLUNGER

37.5°

LEVER

1/4” NPT

SUPPLY

DESCRIPTION

The TW series valves are manually operated, non-graduating,

on-off valves. They are extensively used in air systems to

control nonmodulating air controlled devices. They may be

lever or button operated, direct or remote control.

The TW-1™valve (Figure 1) is normally panel mounted and

can be provided with a steel, zinc or nylon manually operated

lever. Some are equipped with a steel lever with connectors

for Bowden cable control. All TW-1™valves have 1/8" NPT

ports.

The TW-3™valve (Figure 2) is lever operated, either direct or

remote and differs from the TW-1™valve in having 1/4" NPT

ports and a larger body and capacity. Some versions have a

heavy inlet valve spring making them suitable for vacuum

control.

TW-4™(Figure 3) and TW-5™valves are similar to the TW-1™

valve except the plunger is designed for a push button

(TW-4™valve), giving momentary application whenever the

button is depressed. The TW-5™valve is similar, but has an

extended plunger.

SUPPLY

CAP NUT

INLET VALVE

SPRING

INLET VALVE

PLUNGER RETURN

SPRING

PLUNGER

SEAL

INLET VALVE

PLUNGER RETURN SPRING

PLUNGER

FIGURE 3 - TW-4™CONTROL VALVE FIGURE 4 - TW-6™CONTROL VALVE

The TW-6™valve (Figure 4) is a TW-1™valve with a grounding

switch included. In the exhaust position the switch is open.

When the valve is applied the switch is closed.

OPERATION

With air pressure at the supply port (Figure 1) and the plunger

in the upward position, the valve is in the exhaust position.

The delivery ports are open to atmosphere through the

exhaust passage in the center of the plunger.

When the plunger is depressed by the cam action of the

lever (Figure 1) or by a direct force on a push button (Figure

3) the plunger contacts the inlet valve, closing the exhaust

passage and pushes the inlet valve off the inlet seat in the

body, allowing supply air to flow through the delivery ports

to the controlled device.

SERVICE CHECKS

OPERATING AND LEAKAGE TESTS

Connect a 100 psi air pressure source to the supply port

and connect delivery to an air gauge (if there are two delivery

ports, plug one). With the valve in the released position,

check for leakage at the exhaust holes with a soap solution.

Place the valve in the applied position. Supply air pressure

should show on the gauge. Check for leakage at the exhaust

holes.

Leakage should not exceed 100 SCCM or a 1" bubble formed

in 5 seconds.

If the TW valve does not function as described or if excessive

leakage occurs, it is recommended that it be replaced with

a new unit or repaired with genuine Bendix parts.

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

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 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.

SCREW

PUSH

BUTTON

NUT

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.

REMOVAL

Disconnect all air lines and remove the valve.

INSTALLATION

Place the valve handle through appropriate hole in the panel,

place the dial (if used) over handle and install the mounting

screws. Connect the air lines. Apply air pressure and check/

repair air leaks.

PREVENTIVE MAINTENANCE

Important: Review the Bendix Warranty Policy before

performing any intrusive maintenance procedures. Awarranty

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 TW

valves should be inspected every 6 months or 1500 operating

hours, whichever comes first, for proper operation. Should

the TW valves not meet the elements of the operational tests

noted in this document, further investigation and service of

the valve may be required.

DISASSEMBLY

Remove the operating handle or lever by driving the pin out

of the body and remove the lever, plunger and plunger spring.

Remove the o-ring seal from the plunger.

Remove the supply cap nut, inlet valve and spring. Remove

the o-ring from the supply cap nut.

CLEANING AND INSPECTION OF PARTS

Wipe all rubber parts clean. Clean the plastic and metal

parts in mineral spirits and dry thoroughly. Inspect all rubber

parts for wear or deterioration and replace where necessary.

Examine the inlet seat in the body if nicked or corroded.

Inspect all springs for cracks, distortion or corrosion and

replace if necessary.

ASSEMBLY

Prior to assembly lubricate the body bore, plunger, plunger

dome, o-rings, lever cam, lever pin, and cap nut threads

with Bendix barium base grease part number 246671.

1) Place inlet valve in body.

2) Place inlet valve spring on inlet valve.

3) Place o-ring on cap nut and install cap nut.

4) Install plunger spring into top of body.

5) Install o-ring seal on plunger and install plunger.

TW-1™, TW-3™& TW-6™CONTROL VALVES

Depress the plunger, place lever cam in slot in body, line up

holes in body with hole in lever and insert the pin. Support

the body and drive the pin in fully.

TW-4™& TW-5™CONTROL VALVES

Depress the plunger with button until hole in plunger lines

up with holes in body. Insert the pin, support body and drive

the pin in fully.

LEAKAGE TEST

Test the valve per instructions in the Service Checks section

of this document.

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