BENDIX RE-6NC Manuale - Pagina 5

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RE-6

™

& RE-6NC

™

VALVES SERVICE

APPLICATION

During normal, service braking operation, the valve serves

as a relay valve, synchronizes tractor service (application)

RESERVOIR

70 PSI

RE-6NC

FIGURE 7 RE-6NC

™

RELAY VALVE CHARGING ABOVE 70

PSI

air pressure with trailer service (application) air pressure

as the service foot brake valve on the tractor is operated.

If the tractor is equipped with a trailer hand (TC) valve, the

trailer brakes can be applied independently of the tractor

CHAMBER

APPLICATION

10 PSI

FIGURE 8 RE-6

™

& RE-6NC

APPLICATION

brakes. Air is applied to the control port of the RE-6

™

RE-6NC

valves, acting on the primary piston and moving

the inlet / exhaust valve away from the seat on the

emergency piston. Service application allows air to ﬂ ow

from the reservoir, past the shoulder (on the emergency

piston) to the underside of the relay piston and on to the

service chambers to apply the brakes. Refer to Figure 8.

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RE-6

& RE-6NC

VALVES SERVICE HOLD

Air is still being applied to the control port of the RE-6

™

and RE-6NC

valves, but the relay piston has moved

EMERGENCY

SUPPLY

70 PSI

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Relay Valve

SERVICE

BRAKE

APPLICATION

10 PSI

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RELAY VALVES SERVICE

CHAMBER

HOLD 5 PSI

FIGURE 9 RE-6

HOLD

enough to allow the inlet / exhaust valve to re-seat on the

emergency piston and close the inlet / exhaust valve. Air

is trapped between the seal of the emergency piston and

inlet / exhaust valve and the service chambers, making the

service brake application. The entrapment of air constitutes

the holding position of the valve. At this time, no air is

ﬂ owing through the valve. Refer to Figure 9.

FIGURE 10 RE-6

EXHAUST

RE-6

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& RE-6NC

When air is removed from the control port of the RE-6

™

and

™

RE-6NC

valves, the relay piston moves upward. As the

air is let off the control port, the relay piston moves from

its seat on the inlet / exhaust valve, opening the exhaust

path to atmosphere. Air ﬂ ows from the service chambers,

past the relay piston, through the emergency piston and

inlet / exhaust valve to atmosphere past the diaphragm.

Refer to Figure 10.

™

& RE-6NC

RELAY VALVES SERVICE

0 PSI

™

& RE-6NC

™

RELAY VALVES SERVICE

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VALVES SERVICE EXHAUST

SERVICE

HOLD

5 PSI

NO AIR FLOW

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and