BENDIX TR-2 Istruzioni per il montaggio

SD-03-4650

Bendix®TR-2™ & TR-3™Inversion Valves

DESCRIPTION

GENERAL

The Bendix® TR-2™& TR-3™valves are normally open,

pilot-operated, inverting, on-off, two-way valves. As control

pressure is reduced—to the point that the piston return

spring or springs overcomes the force on the control

piston—the valve will deliver full supply pressure at the

delivery port.

BENDIX®TR-2™INVERSION VALVE

Referring to Figure 1, the Bendix TR-2 valve was used

primarily in early Bendix® DD-3™safety actuator control

systems. It applied air pressure to the emergency

diaphragm of the DD-3 actuators from a protected reservoir

as control pressure is released from the lock mechanism.

The TR-2 valve is available in 1-1/4" bulk head-mount only.

BENDIX®TR-3™INVERSION VALVE

Referring to Figure 2, the Bendix TR-3 valve is similar in

function to the Bendix TR-2 valve, but with a die cast body.

Referring to Figure 3, some TR-3 valves have an internal

passage in the body connecting supply pressure to control.

The external control port is permanently plugged in such

valves.

OPERATION

BENDIX TR-2 & TR-3 INVERSION VALVES

When sufﬁcient air pressure is present in the control cavity

to overcome the setting of the piston return spring, the

piston is held away from the inlet valve which is, in turn,

held closed by the inlet valve return spring. The delivery

lines are vented to atmosphere through the hollow exhaust

stem of the piston. When air pressure in the control cavity

falls to a predetermined pressure—or is vented from the

control cavity—the piston spring forces the piston against

the inlet valve, closing the exhaust passage in the hollow

piston stem. Further travel of the piston opens the inlet

valve allowing the passage of air past the open inlet valve,

and out the delivery port.

FIGURE 1 - BENDIX®TR-2™INVERSION VALVE

CONTROL PORT (3)

CAP SCREW

DELIVERY PORT (2)

CAP NUT

SEAL RING

PISTON

MOUNTING NUT

& LOCKWASHER

INLET & EXHAUST

VALVE

PISTON GROMMET

(SMALL)

PISTON GROMMET

(LARGE)

EXHAUST

DIAPHRAGM

COVER PLATE

DIAPHRAGM WASHER

RETAINER RING

PISTON SPRINGS

BODY

INLET & EXHAUST

VALVE SPRING

SUPPLY PORT

EXHAUST

FIGURE 2 - BENDIX®TR-3™INVERSION VALVE FIGURE 3 - BENDIX®TR-3™INVERSION

VALVE INTERNAL BLEED CONTROL

The Bendix® TR-3™valve, with the internal control passage

functions the same as described in the previous paragraph.

The only exception is that the control pressure is always

the same as the supply pressure. Consequently, as supply

pressure builds up, when the pressure is great enough to

overcome the piston return spring, the delivery pressure

will be vented out the exhaust. On descending supply/

control pressure, as the piston return spring overcomes

the control pressure the valve will deliver the remaining

supply pressure at the delivery port.

MOUNTING LOCATION

Care should be given to assure proper mounting location

of the valve with the exhaust pointed downward (toward

the road surface). It should be mounted high on the frame

rail, and away from road spray and debris. Unprotected

or exposed exhaust ports can allow migration of road

contaminants into the valve, which may cause accelerated

wear or unintended operation.

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 inversion valves should be inspected every six(6)

months or 1500 operating hours, whichever comes ﬁrst,

for proper operation. Should the inversion valves not

meet the elements of the operational tests noted in this

document, further investigation and service of the valve

may be required.

The TR-3 valve is non-serviceable while the Bendix® TR-2™

valve can be serviced with a maintenance kit. For the latest

service parts and kits, refer to the Bendix Quick Reference

Catalog (BW1114) available for order or download at

www.bendix.com

OPERATING AND LEAKAGE TESTS

NOTE: The following checks should be made with two

calibrated gauges or two gauges known to be

accurate. Depending upon installation, it may be

easier or necessary to completely remove the

valve to test properly.

Install one test gauge in a common control and supply

line; install the other gauge in the delivery port. Gradually

apply pressure to the common supply and control line. On

ascending pressure, note at what pressure exhaust occurs

and compare with the vehicle manual. With air pressure

present in supply and control ports, apply a soap solution to

the delivery and exhaust ports. Leakage should not exceed

100 SCCM or a 1" bubble in 5 seconds. Excessive leakage

would indicate a faulty o-ring or inlet valve.

Slowly decrease pressure in the control cavity and note

at what pressure delivery is made. Compare this with the

vehicle manual notation.

EXHAUST

DIAPHRAGM

1/4” P.T.

DELIVERY

EXHAUST

NUT

O-RING

VALVE

SPRING

O-RING

INLET &

EXHAUST

VALVE

PISTON

DIAPHRAGM

RETAINER

CAP

1/8” P.T.

CONTROL

VALVE STOP

SHIM

PISTON SPRING

1/4” P.T. SUPPLY

INTERNAL

PASSAGE

NOTE: In the Bendix® TR-3™valve shown in Figure 3,

control pressure is reduced by decreasing supply

air pressure because of the internal passage

connecting supply and control.

If the Bendix® TR-3 inversion valve does not function as

described—or leakage is excessive—it is recommended

that it be replaced with a new valve or remanufactured unit.

The Bendix TR-2valve can be serviced with a maintenance

kit or replaced with a new or remanufactured valve.

REMOVAL AND INSTALLATION

REMOVAL

Block and hold vehicle by means other than the air brakes.

Drain service and emergency or parking reservoirs.

Disconnect air lines from valve. Remove the mounting

bolts, remove valve.

INSTALLATION

Remount valve securely using holes provided in body.

Check and clean air lines and reconnect.

GENERAL SAFETY GUIDELINES

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 a Bendix®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®brand 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.

11. For vehicles with Automatic 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.

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