BENDIX DUAL RELAY VALVE Manuale

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Bendix

Dual Relay Valve

RESERVOIR

SUPPLY

PORT (11)

FIGURE 1 - DUAL RELAY VALVE

DESCRIPTION

The Dual Relay Valve is a special purpose, multifunction

relay valve. It is typically used on articulated vehicles with

three or more axles. Normally mounted at the rear of the

vehicle, in proximity to the valves and chambers served, its

function is similar to a pilot relay and speeds the application

and release of control air pressure to the service relay

valve(s) on the rear most axle or axles of the vehicle. The

Dual Relay Valve is a pilot relay valve that responds to the

control air delivered to it from both circuits of the foot brake

valve. The Dual Relay Valve is controlled independently

by the front (secondary) and mid (primary) delivery circuits

of the dual circuit foot brake valve.

The Dual Relay Valve is supplied air from the rear axle(s)

service reservoir that is isolated from the other service

reservoirs forming a third service brake circuit on the

vehicle. With the addition of a third brake circuit the vehicle

will maintain braking on at least two axles in the event of a

single service system malfunction. In systems where this

valve is used, the brake circuits are designated as Front

(steering) Axle, Mid-Axle and Rear Axle.

CAST PORT

IDENTIFICATION

PRIMARY

CONTROL

PORT (41)

DELIVERY

PORT (22)

MOUNTING

BRACKET STUDS

SECONDARY

CONTROL

PORT (42)

Although typically nipple mounted to the rear service

reservoir the valve can be bracket mounted. Only four (4)

ports are utilized in the die cast body of the Dual Relay

Valve. All air connections are identiﬁ ed with raised numerals

with the following designations:

Port ID

Size

3/8 NPTF

12, 43

Plugged

3/8 NPTF

OPERATION

Refer to ﬁ gures 1 and 2. Each service reservoir is isolated

and is protected from loss of air in other service reservoirs.

The front and mid-axle service reservoirs supply air directly

to the secondary and primary circuits of the foot brake

valve, as well as antilock and traction components for their

respective circuits. The rear axle service reservoir supplies

air to the Dual Relay Valve, as well as the rear axle service

antilock relay and traction components.

RESERVOIR

SUPPLY

PORT (11)

EXHAUST

PORT (1)

Designation

Primary Control Port

Secondary Control Port

Not used

Delivery

Rear Service Reservoir