1
Bendix
®
R-12
™
& R-14
™
Relay Valves
DESCRIPTION
The relay valve in an air brake system functions as a relay
station to speed up the application and release of the brakes.
The valve is normally mounted at the rear of the vehicle in
proximity to the chambers it serves. The valve operates as a
remote controlled brake valve that delivers or releases air to
the chambers in response to the control air delivered to it
from the foot brake valve or other source.
The R-12
™
and R-14
™
relay valves are designed for either
reservoir or frame mounting. A universal mounting bracket is
furnished that permits easy interchange with other Bendix
relay valves. Both valves are available in the two body styles
illustrated in Figure 1. The R-14
™
valve differs from the
R-12
™
valve in that it incorporates a quick release and anti-
compounding feature located above its horizontal service
port. The R-14
™
valve’s anti-compound feature allows it to
be conveniently used as either a service or spring brake
relay valve. An exhaust cover is installed that protects the
1/8" balance port when the R-14
™
valve anti-compound
feature is not in use.
FIGURE 1 - EXTERIOR VIEWS
EXTERIOR R-14H
EXTERIOR R-12H
SERVICE (1)
SUPPLY (2)
DELIVERY
SERVICE (1)
DELIVERY
SUPPLY (2)
EXTERIOR R-12V
EXTERIOR R-14V
SD-03-1064
DELIVERY
DELIVERY
SUPPLY
