BENDIX LQ-4 Manual

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Bendix

LQ-3

™

& LQ-4

1/4" NPT

™

LQ-3

FRONT AXLE RATIO VALVE

™

FIGURE 1 - LQ-3

AND LQ-4

FUNCTION AND DESCRIPTION

The LQ-3

™

and LQ-4

™

front axle ratio valve is used on the

front or steering axle of a vehicle to limit the brake applica-

tion pressure to the actuators during normal service braking.

Limiting application pressure reduces the braking effort at

the foundation brakes on the steering axle. The supply and

delivery ports in both the LQ-3

tified with embossed lettering. The ports in the LQ-3

are 1/4 inch N.P.T. and in the LQ-4

The exhaust port is not threaded in either valve. Two mount-

ing holes are provided for 5/16 inch mounting bolts. Note:

When mounted on the vehicle the exhaust port should be

pointed down.

GENERAL OPERATION

The supply port of the LQ-3

the delivery port of the service brake valve. The delivery port

of the LQ-3

™

valve is connected to the service port of the

front axle relay valve or the adaptive braking modulator. The

™

LQ-4

valve may be used to operate brake chambers up to

Type 24 without relay or QRV.

Pressure delivered to the LQ supply port is reduced by 50%

as it passes through the valve and out the delivery port. The

50% reduction occurs only when brake application pressure

™

* Front Axle Ratio Valve

(*THE LQ-4

™

VALVE'S OPERATION IS IDENTICAL TO THE LQ-3

INTERNAL CONFIGURATION IS SLIGHTLY DIFFERENT.)

™

FRONT AXLE RATIO VALVE

™

and LQ-4

valves are iden-

™

valve, 3/8 inch N.P.T.

™

or LQ-4

valve is connected to

3/8" NPT

PISTON SPRING

INLET EXHAUST

VALVE SPRING

LOWER PISTON

ASSEMBLY

3/8" NPT

™

LQ-4

™

valve

to the supply port of the LQ is between 0 psi and 40 psi.

Brake applications between 40 psi and 60 psi to the LQ

supply port are reduced by less than 50% and applications

above 60 psi are not reduced at all. An example would be:

65 psi delivered to the supply port results in 65 psi out the

LQ delivery port.

FRONT AXLE RATIO VALVE*

™

VALVE.

™

LQ-3

FRONT AXLE RATIO VALVE

EXTERIOR

HOLD OFF

SPRING

(WHEN REQUIRED)