BENDIX R-12DC DBL CHECK RELAY VALVE Manuel
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®
Bendix
R-12DC
PRIMARY
SERVICE
SUPPLY (2)
EXTERIOR R-12DC
(MODEL WITH 2 HORIZONTAL PORTS)
FIGURE 1 - EXTERIOR VIEWS
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
PRIMARY
SERVICE
PORT
CAP SCREW
SEALING
RING
RELAY
PISTON
O-RING
EXHAUST
SEAT
SPRING
O-RINGS
RETAINING
RING
FIGURE 2 - R-12DC
™
RELAY VALVE WITH BIASED DOUBLE CHECK SECTIONAL VIEW
™
Relay Valve with Biased Double Check
SECONDARY
SERVICE
DELIVERY
™
VALVE
COVER
EXHAUST
PORT
EXTERIOR
™
R-12DC
(MODEL WITH
4 VERTICAL
DELIVERY PORTS)
EXTERIOR
™
R-12DC
(MODEL WITH 2
HORIZONTAL AND 2
VERTICAL DELIVERY
PORTS)
or releases air to the chambers in response to the control
air delivered to it from the foot brake valve.
The R-12DC
™
relay valves are designed for either reservoir
or frame mounting. (See Figure 1). For ease of servicing,
the inlet/exhaust valve can be replaced without the need for
line removal.
SECONDARY
SERVICE PORT
RELAY
PISTON
VALVE
RETAINER
INLET
EXHAUST
VALVE
SPRING
VALVE
VALVE
GUIDE
DOUBLE CHECK
DIAPHRAGM
1