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SD-03-3656

Bendix

TP-3DC

™

Tractor Protection Valve with Double Check

FIGURE 1 - TP-3DC

™

TRACTOR PROTECTION VALVE WITH DOUBLE CHECK

AUXILIARY SUPPLY

1/4" -18 NPT

DATE CODE

STAMPED HERE

TRACTOR SUPPLY

1/4"-18 NPT

TRACTOR CONTROL

(PRIMARY) 3/8"-18 NPT

LABEL WITH

TP-3DC

™

VALVE

O.E. PC. NO. HERE

TRAILER CONTROL

1/2"-14 NPT

QR-L

™

VALVE FACTORY

INSTALLED ON SOME

TP-3DC

™

VALVE MODELS

1/2"-14 NPT

TRACTOR

CONTROL

(SECONDARY)

3/8"-18 NPT

STOP LIGHT

SWITCH

1/4"-18 NPT

TRAILER SUPPLY

1/2"-14 NPT

DESCRIPTION

The tractor protection valve system protects tractor air

brakes during trailer breakaway and/or when severe air

leakage develops in the tractor or trailer. This function is

required by law.

In normal use the tractor protection valve is used to shut off

the trailer control line before disconnecting the tractor from

the trailer. It is usually mounted at the rear of the tractor

cab, and it is used in conjunction with a dash-mounted

control valve.

The TP-3DC

™

valve integrates tractor protection and double

check valve functions. It also has an integral single check

valve that prevents trapping of air in the trailer control line.

This prevents service and spring brake compounding, and

it avoids a trailer roll away situation if the trailer is parked

with the air applied.

A stoplight switch port allows direct stoplight installation,

and the auxiliary supply port, when connected to the

BP-R1

™

control port, eliminates a tee in the tractor

supply line. Also, a QR-L

™

valve can be factory installed

in the trailer control and/or supply port to meet timing

requirements.

Port Embossed I.D. Thread Size

Tractor Supply TRAC SUP 1/4"-18 NPT

Auxiliary Supply AUX SUP 1/4"-18 NPT

Tractor Control (Primary) TRACT CONT 3/8"-18 NPT

Tractor Control (Secondary) TRAC CONT 3/8"-18 NPT

Stop Light Switch STP LT SW 1/4"-18 NPT

Trailer Supply TRLR SUP 1/2"-14 NPT

Trailer Control TRLR CNTL 1/2"-14 NPT

Weight: 1.5 lbs.

Material: Die-cast aluminum

Operating pressure: 150 psi maximum

Operating temperature: -40° to 200° F

Figure 1 shows the TP-3DC

™

valve with its port designations,

O.E. piece number, and date code identiﬁ cations.

Figure 2 is a sectional view of the TP-3DC

™

valve, and

Figure 3 presents the TP-3DC

™

valve in a partial air brake

system schematic.

1 2 3 4 5 6 7 8

Shrnutí obsahu

Strany 1 - SD-03-3656

1 SD-03-3656Bendix® TP-3DC™ Tractor Protection Valve with Double CheckFIGURE 1 - TP-3DC™ TRACTOR PROTECTION VALVE WITH DOUBLE CHECKAUXILIARY SUPPLY 1/

Strany 2 - OPERATION

2FIGURE 3 - PARTIAL AIR BRAKE SYSTEM SCHEMATIC WITH TP-3DC™ TRACTOR PROTECTION VALVE WITH DOUBLE CHECKTRACT CONTTRLR SUPTRAC CONTSTP LT SWTRLR CNTLFI

Strany 3

3FIGURE 5 - SERVICE BRAKE APPLICATIONFIGURE 4 - INITIAL CHARGEDIAPHRAGMGUIDEVALVE SPRINGTRAILERCONTROLTRAILER SUPPLYAUXILIARY SUPPLYTRACTOR SUPPLYPLU

Strany 4 - INJURY OR DEATH:

4FIGURE 6 - SERVICE BRAKE RELEASEDIAPHRAGMGUIDEVALVE SPRINGTRAILERCONTROLTRAILER SUPPLYTRACTOR SUPPLYPLUNGERSTOP LIGHTSWITCHTRACTOR CONTROL (SECONDAR

Strany 5

5FIGURE 7 - TRACTOR PROTECTIONFIGURE 8 - ANTI-COMPOUNDINGDIAPHRAGMGUIDEVALVE SPRINGTRAILERCONTROLTRAILER SUPPLYTRACTOR SUPPLYPLUNGERSTOP LIGHTSWITCHT

Strany 6 - INSTALLATION

64. 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 pressur

Strany 7 - CLEANING AND INSPECTION

7FIGURE 9 - TP-3DC™ VALVE EXPLODED VIEWGUIDEVALVE SPRINGPLUNGERCOVER1/4” HEX/TORX SCREWBODY123456789DISASSEMBLYThe following disassembly and assembly

Strany 8

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