Bendix Commercial Vehicle Systems SR-5 TRAILER SPRING BRK VALVE 4/11 - Manual

1
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SD-03-4516
Bendix ® SR-5 ™ Trailer Spring Brake Valve
FIGURE 1 SR-5 ™ TRAILER SPRING BRAKE VALVE
*SHOWN WITH OPTIONAL ANTI-COMPOUNDING COVER
SR-5 ™ VALVE
IDENTIFICATION
HOLE
1/4” NPT TRAILER
SERVICE
1/4” NPT
TRAILER SUPPLY
EXHAUST
COVER*
1/4” NPT
SERVICE
RESERVOIR
(2)
3/8” NPT
DELIVERY (4)
1/2” OR 3/4” NPT
SPRING BRAKE
RESERVOIR
PRESSURE
PROTECTION
VALVE
DESCRIPTION
The SR-5 ™ valve is a reservoir-mounted trailer valve that can
control up to four spring brake actuators during parking or
emergency applications. It has the following capabilities:
• Automatically applies trailer spring brakes in the event of
a breakaway or trailer supply line failure.
• Protects trailer reservoir(s) air pressure in the event of a
breakaway or trailer supply line failure.
• Allows no automatic trailer spring brake application with
air pressure loss in trailer reservoir(s).
• Allows the trailer spring brakes to be applied and released
repeatedly with a failed trailer reservoir(s):
• Optional anti-compounding-prevents an overriding service
brake signal while the trailer supply line is at atmospheric
pressure.
• Does not allow service system charging if a failure occurs
in the parking brake circuit.
PORTS
1 - 1/2" or 3/4" NPT Spring Brake Reservoir Mounting
(SPR BK RES)
1 - 1/4"-18 NPT Trailer Supply (TRL SUP)
1 - 1/4"-18 NPT Trailer Service (TRL SER)
4 - 3/8"-18 NPT Delivery (DEL)
2 - 1/4"-18 Service Reservoir (SERV RES)
1 - Exhaust (EXH)
The SR-5 ™ valve appears very similar to the SR-2 ™ valve.
Both valves consist of a die-cast aluminum body and cover,
pressure protection valve, and reservoir-mounting nipple.
However, Figure 1 notes the distinguishing characteristic of
the SR-5
™ valve–a hole drilled into the flat surface between
the pressure protection valve and the body.