BENDIX BP-R1 BOBTAIL PROP RELAY VALVE Manuale
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®
™
Bendix
BP-R1
CONTROL
EXHAUST
SUPPLY
DESCRIPTION
The BP-R1
™
bobtail proportioning relay valve is a combina-
tion of two individual valves in a single housing. The lower
portion, or body, of the BP-R1
service brake relay valve, which functions as a relay station
to speed up brake application and release. The upper por-
tion, or cover, houses a brake proportioning valve, which
reduces normal service brake application pressure when
the tractor is not towing a trailer.
Used in tractor air brake systems only, the BP-R1
is installed in place of a standard relay valve. It functions
as a standard service relay during operation of a tractor-
trailer combination. During bobtail tractor operation, the
™
BP-R1
valve improves controllability and reduces stopping
distances by reducing air pressure to the rear actuators/
chambers, whose axle load has been greatly reduced.
While the BP-R1
™
valve can incorporate various crack
pressures to accommodate specific applications, the
standard is 4 psi.
Bobtail Proportioning Relay Valve
SERVICE
DELIVERY
™
valve contains a "standard"
FIGURE 1 - BP-R1
Designed for frame or cross member mounting, the BP-R1
valve is furnished with a mounting bracket which is attached
to two of the four cover cap screws. Replacement valves
are furnished with a universal mounting bracket, which
allows the BP-R1
relays.
All air connections on the BP-R1
cast, embossed letters for ease of installation. The letter
™
valve
identifi cation and air line connections are shown below
for reference.
BP-R1
Valve Air Connection
™
Supply (to reservoir)
Delivery (to brake actuator)
Service (brake valve rear axle service delivery)
Control (to delivery of trailer supply valve)
SERVICE
CONTROL
™
BOBTAIL PROPORTIONING RELAY VALVE
™
valve to replace most standard
™
valve are identifi ed with
Embossed Identifi cation
EXHAUST
SUPPLY
™
SUP
DEL
SER
CON
1