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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 differs from the R-
12 in that it incorporates a quick release and
anti-compounding feature located above its horizontal
service port. The R-14s anti-compound feature allows it
FIGURE 1 - EXTERIOR VIEWS
EXTERIOR R-14HEXTERIOR R-12H
SERVICE (1)
DELIVERY
SUPPLY (2)
SERVICE (1)
DELIVERY
SUPPLY (2)
EXTERIOR R-12V
EXTERIOR R-14V
SD-03-1064*
* FORMERLY SD-03-31
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