BENDIX SD-03-4516 User Manual download pdf (Page 3)

FIGURE 3 - CHARGING BELOW 70 PSI

TRAILER SUPPLY

SPRING

BRAKE

CHAMBER

TRAILER SERVICE RES.

CONTROL PISTON

DELIVERY

OPERATION

CHARGING BELOW 70 PSI (SEE FIGURE 3)

Air ﬂ ows through the trailer supply line, enters the Bendix

SR-5

™

valve trailer supply port, and moves the control

piston. The control piston contacts the control inlet/exhaust

valve, sealing off the piston’s exhaust passage.

As piston travel continues, the control inlet valve opens. Air

acting on the control piston also ﬂ ows through passage A,

unseating check valve B, and ﬂ owing past the open control

inlet valve. This air ﬂ ows into the spring brake cavities,

releasing the spring brakes.

CHARGING ABOVE 85 PSI (SEE FIGURE 4)

Air pressure acting on the control piston and ﬂ owing

through passage A also acts on pressure protection valve

C. At approximately 85 psi, valve C opens. This allows

the air to ﬂ ow past check valve D and charge the trailer

reservoir(s). The trailer braking system is now in the normal

run mode. Service braking occurs through the trailer

service relay valve.

EXHAUST

PASSAGE A

TRAILER SERVICE

CHECK

VALVE

SERVICE/

SPRING BRAKE

RESERVOIR

CONNECTION

SERVICE

RELAY

VALVE

CHECK

VALVE

FIGURE 4 - CHARGING ABOVE 85 PSI

CONTROL PISTON

PRESSURE

PROTECTION

VALVE C

SPRING

BRAKE

CHAMBER

TRAILER SERVICE RES.

EXHAUST

PASSAGE A

TRAILER SERVICE

CHECK

VALVE B

SERVICE/

SPRING BRAKE

RESERVOIR

CONNECTION

SERVICE

RELAY

VALVE

DELIVERY

CHECK

VALVE D

1 2 3 4 5 6 7 8 9

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BENDIX SD-03-4516 User Manual Page 3

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