Bendix Commercial Vehicle Systems TW-6 User Manual

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

REVERSED LEVER

POSITION

SCREW

#10-24

THD.

(2 HOLES)

1/8” P.T.

DELIVERY

(2 PORTS)

1/8” P.T. SUPPLY

FIGURE 1 TW-1™ CONTROL VALVE

EXHAUST

PLUNGER

SEAL

SUPPLY

CAP NUT

SD-03-3602

LEVER

DIAL

PANEL THICKNESS .06 OR LESS

PLUNGER

PLUNGER RETURN

SPRING

INLET VALVE

SPRING

37.5°

EXHAUST

PLUNGER

SEAL

SUPPLY

CAP NUT

FIGURE 2 - TW-3™ CONTROL VALVE

37.5°

LEVER

PLUNGER PLUNGER RETURN SPRING

INLET VALVE

VALVE SPRING

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.

.28” DIA.

2 HOLES-1.88”

APART

LEVER

1/4" P.T.

DELIVERY

PORTS (2)

1/4” NPT

SUPPLY

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.

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PUSH

SCREW

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

BUTTON

NUT

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 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 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.

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