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More info: visit www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Tractor P rotection Valves
Tractor Pr otection Valves
The primary function of tractor protection valves (e.g.
the TP-3
®
tractor protection valve) is to protect
the tractor air brake system under trailer breakaway
conditions and/or conditions where severe air leakage
develops in the tractor or trailer. In addition, in
everyday use, the valve is used to shut off the trailer
service and supply lines before disconnecting the
tractor from the trailer. The valve is usually mounted
at the rear of the tractor cab and a dash mounted
control valve.
The TP-3DC
™
tractor protection valve integrates the
functions of the TP-3
®
valve and one double check
valve. A stop light switch port is provided and is
connected to the delivery of the internal double check
valve. It also has an internal single check valve that
prevents air pressure from being trapped in the trailer
service line, which prevents brake compounding and
minimizes roll away conditions.
The TP-5
™
tractor protection valve is designed to
incorporate several pneumatic control functions within
a common housing, thereby eliminating considerable
interconnection piping.
It includes a combination of two double check valves
and a tractor protection valve. With this valve, either
brake circuit on the vehicle can be used to apply the
trailer brakes. In addition, when used in conjunction
TP-5
™
Tractor
Protection Valve
TP-3DC
™
Tractor
Protection
Valve
with a control valve, it opens and closes the trailer
service and supply lines in the same manner as a
tractor protection valve. The valve also incorporates
porting for the installation of the service stop lamp
switch, and a quick release valve for the trailer service
line.
TP-3
®
Tractor
Protection
Valve
TP-5
™
Tractor
Protection
Valve
Service Hose to Trailer
Supply Hose to Trailer
Hose Couplings
Dummy Hose
Coupling
To the Tractor Spring Brakes
From Secondary Reservoir
From Primary Reservoir
From Rear Axle Service Reservoir
From Front Axle Service Reservoir
SL-5
™
Stop Light
Switch
MV-3
®
Dash
Control Valve
Front Axle Delivery
Rear Axle Delivery
Existing Brake Valve
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