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BENDIX R-12DC Service Data

Relay valve with biased double-check
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Bendix
R-12DC
®
PRIMARY
SERVICE
SUPPLY (2)
EXTERIOR BENDIX
(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
or releases air to the chambers in response to the control
air delivered to it from the foot brake valve.
PRIMARY
SERVICE
PORT
CAP SCREW
SEALING
RING
RELAY
PISTON
O-RING
EXHAUST
SEAT
SPRING
O-RINGS
RETAINING
RING
Figure 2 – Bendix
R-12DC
®
Relay Valve with Biased Double-Check
®
SECONDARY
SERVICE
DELIVERY
R-12DC
VALVE
®
®
COVER
EXHAUST
PORT
Relay Valve with Biased Double-Check Sectional View
®
EXTERIOR
R-12DC
®
(MODEL WITH
4 VERTICAL
DELIVERY PORTS)
EXTERIOR
R-12DC
®
(MODEL WITH 2
HORIZONTAL AND 2
VERTICAL DELIVERY
PORTS)
Bendix
R-12DC
®
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
relay valves are designed for either
®
GUIDE
DOUBLE-CHECK
DIAPHRAGM
1

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Summary of Contents for BENDIX R-12DC

  • Page 1 SECONDARY RING SERVICE PORT RELAY PISTON O-RING EXHAUST SEAT RELAY DOUBLE-CHECK SPRING PISTON DIAPHRAGM VALVE O-RINGS RETAINER INLET EXHAUST RETAINING VALVE GUIDE EXHAUST SPRING RING PORT Figure 2 – Bendix R-12DC Relay Valve with Biased Double-Check Sectional View ® ®...

  • Page 2: General Safety Guidelines

    ▲The power MUST be temporarily disconnected from the radar sensor whenever any tests USING A DYNAMOMETER are conducted on a vehicle equipped with a Bendix ® Wingman system.
  • Page 3 In the event of a loss of the ANTILOCK primary service line, (see Figure 5) the double-check valve MODULATOR mechanism in the cover of the Bendix R-12DC valve will ® ®...

  • Page 4: Preventive Maintenance

    PREVENTIVE MAINTENANCE BALANCE Important: Review the Bendix Warranty Policy before The air pressure being delivered by the open inlet valve performing any intrusive maintenance procedures. A also is effective on the bottom area of the relay piston. When air pressure beneath the piston equals the service...
  • Page 5 AIR PRESSURE FROM BRAKE BRAKE BRAKE CHAMBERS IS CHAMBERS CHAMBERS EXHAUSTED RELEASED MAINTAIN HERE APPLICATION Figure 6 – Bendix R-12DC Valve Balance Position Figure 7 – Bendix R-12DC Valve Exhaust Position ® ® ® ® REMOVAL AND INSTALLATION DISASSEMBLY Note: Prior to disassembly, mark the location of the REMOVAL mounting bracket to the cover and the cover to the body.
  • Page 6 4 psi, a differential spring is used in the assembly to produce the required valve response. (Models designed to have a 4 psi crack pressure do not require a differential spring.) Figure 8 – Bendix R-12DC Exploded View ® ®...

  • Page 7: Cleaning And Inspection

    2. Inspect all lines and/or hoses for damage and replace 5. Inspect the check valve seat in the R-12DC valve cover as necessary. and make sure all internal air passages in this area are 3.
  • Page 8 Log-on and Learn from the Best On-line training that's available when you are 24/7/365. Visit www.brake-school.com. SD-03-1068 Rev. 007 © 2016 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • 04/16 • All Rights Reserved.