BENDIX RE-6NC Manuel - Page 3

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on to the relay portion of the valve. The emergency function

of the valve automatically applies full trailer reservoir air

pressure to the trailer chambers when the trailer supply

pressure falls below a predetermined minimum value.

The RE-6

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/RE-6NC

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relay emergency valve may be

ﬂ ange or reservoir mounted. Ports are clearly identiﬁ ed for

delivery, service, emergency (supply) and reservoir lines.

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RE-6NC

VALVE DESCRIPTION

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The RE-6NC

valve is a special non-charging relay

emergency valve. It is used on dollies to comply with

FMVSS 121. The RE-6NC

a protected reservoir to provide the release air for the trailer

spring brakes when the following requirements are met:

- The trailer supply line must be 70 psi minimum with any

leakage-type service system failure.

- The parking brake must not drag at trailer supply line

pressures above 70 psi.

The relay function of the RE-6NC

of the RE-6

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valve, serving the dolly or trailer system as

a remote controlled brake valve. The emergency function

of the valve automatically applies full trailer reservoir air

pressure to the trailer or dolly chambers when the trailer

supply pressure falls below a predetermined minimum

value. The major difference between the RE-6

™

RE-6NC

valve is that the RE-6NC

pressure (initial charge) to release the spring brakes before

the dolly or trailer reservoir(s) is ﬁ lled.

RE-6

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& RE-6NC

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VALVE SYSTEM

CONFIGURATION

In the RE-6

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valve dolly system, the supply air ﬂ ows to the RE-

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valve, passes through the valve, holding the chambers in

the apply position while simultaneously ﬁ lling the reservoir.

In the RE-6NC

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valve dolly system, reservoir air is not

supplied through the RE-6NC

valve system. The supply air ﬂ ows to the RE-6NC

acts upon the emergency piston, pushing the emergency

piston toward the inlet / exhaust valve seat. System

pressure in the chambers and reservoir are still at 0 psi in the

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RE-6NC

valve system, allowing for faster trailer pull-away.

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In the RE-6NC

valve system, air is also ﬂ owing to the

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PR-3

valve, which will allow the air to ﬂ ow on to the

reservoir at a pressure setting of about 70 psi. The major

difference between the RE-6

valve is that the RE-6NC

system to charge the reservoir to a predetermined psi

before drive away is allowed. Refer to Figure 3.

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valve eliminates the need for

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valve is identical to that

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and the

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valve allows supply

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valve, as it is in the RE-6

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valve and the RE-6NC

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valve does not require the

RESERVOIR

45 PSI

CHAMBERS

45 PSI

0 PSI

RE-6NC

FIGURE 4 RE-6

BELOW 45 PSI

CHARGING THE RE-6

BELOW 45 PSI

When the air brake system is charging below 45 psi,

emergency supply air enters the RE-6

valves emergency port. In the RE-6

the check valve and the emergency piston. In the RE-6NC

valve the air acts on the emergency piston, because there

is no check valve present. This allows for faster drive away

™

(reference FMVSS 121 regulation). In the RE-6

valve,

supply air is forced past the check valve, ﬂ owing through

the emergency piston shoulder and past the inlet / exhaust

valve. The air ﬂ ows to the upper portion of the valve,

underneath the relay piston and out to the service brake

chambers while simultaneously ﬁ lling the reservoir with the

same air that is passing through the emergency piston. In the

RE-6NC

™

valve, air is only acting upon the emergency

piston. The check valve is not present. In replacement

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of the check valve, the RE-6NC

control valve (the Bendix

reservoir to be ﬁ lled. The PR-3

from the RE-6NC

operation of the RE-6NC

valve piston, but will not ﬂ ow on to the reservoir until about

70 psi. Refer to Figure 4.

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RE-6

Relay Valves

0 PSI

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Relay Valves

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& RE-6NC

RELAY VALVES CHARGING

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& RE-6NC

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valve the air acts on

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valve uses a reservoir

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PR-3

valve), to allow the

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valve is totally separate

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valve, but is necessary for proper

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valve. Air acts on the PR-3

EMERGENCY

SUPPLY

45 PSI

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VALVES

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and RE-6NC

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valve, the

™