BENDIX R-12DC DBL CHECK RELAY VALVE Manual
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BENDIX R-12DC DBL CHECK RELAY VALVE Manual

Relay valve with biased double check
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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

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Summary of Contents for BENDIX R-12DC DBL CHECK RELAY VALVE

  • Page 1 ® ™ Bendix R-12DC Relay Valve with Biased Double Check PRIMARY SERVICE SECONDARY SERVICE EXTERIOR ™ R-12DC VALVE (MODEL WITH 4 VERTICAL DELIVERY PORTS) EXTERIOR ™ R-12DC VALVE SUPPLY (2) (MODEL WITH 2 DELIVERY HORIZONTAL AND 2 VERTICAL DELIVERY EXTERIOR R-12DC ™...

  • Page 2: Operation

    OPERATION APPLICATION R-12DC ™ Under normal conditions, the internal biased double check VALVE valve assures that the primary service signal controls the valve. Air pressure delivered to the primary service port RELAY PISTON enters the small cavity above the piston and moves the piston down.

  • Page 3: Preventive Maintenance

    PREVENTIVE MAINTENANCE 4. Disconnect air lines from valve* . Important: Review the Bendix Warranty Policy before 5. Remove valve from reservoir or if remotely mounted, performing any intrusive maintenance procedures. A warranty remove mounting bolts and then valve.
  • Page 4 Key No. DESCRIPTION VALVE COVER CAP SCREW VALVE SPRING CHECK VALVE GUIDE CHECK VALVE PRIMARY CONTROL O-RING PORT 1/4 NPT DOUBLE CHECK COVER O-RING O-RING RELAY PISTON VALVE BODY INLET & EXHAUST VALVE VALVE RETAINER SPRING O-RING O-RING EXHAUST COVER SECONDARY RETAINING RING CONTROL PORT...

  • Page 5: Cleaning And Inspection

    1. Install o-rings (14 & 15) in the exhaust cover assembly be replaced with new or remanufactured units or repaired (16). with genuine Bendix parts, available at any authorized Bendix parts outlet. 2. Install o-ring (8) on piston (9). GENERAL SAFETY GUIDELINES...
  • Page 7 Always wear safety glasses. ® 8. Use only genuine Bendix replacement parts, 2. Stop the engine and remove ignition key when components and kits. Replacement hardware, working under or around the vehicle. When tubing, hose, fittings, etc.
  • Page 8 BW1933 © 2007 Bendix Commercial Vehicle Systems LLC. All rights reserved. 3/2007 Printed in U.S.A.

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R-12dc

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