BENDIX MC-12 MODULATOR CONTROLLER ASSY Guide de dépannage télécharger pdf (Page 25)

More info: visit www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)

Relay Valves

Relay valves are primarily used on vehicles to apply

and release rear axle(s) service or parking brakes.

When the driver applies the brakes, air travels through

the delivery (in this case signal) line to the relay valve

and moves an internal piston down. This closes the

exhaust and opens the delivery of air to the brakes.

The primary beneﬁ ts of using a relay valve is that the

high capacity of air needed for braking is delivered

directly and does not have to travel up to the brake

valve and then all the way to the brakes. The brake

force is adjustable and when released the relay valve

exhausts to atmosphere. Relay valves are generally

mounted close to the chambers they serve and are

available in both remote and reservoir mount designs.

The inlet/exhaust valve cartridge can be replaced

without line removal.

In order to design braking systems with good brake

timing, that is, where brake application occurs in the

correct sequence, some models of relay valves are

available in multiple “crack pressures”. The crack

pressure value for a particular valve is varied by the

use of different strength return springs within the valve

which the air pressure signal must overcome before air

begins to be delivered to the brake chambers.

The R-8

™

and R-14

relay valves both incorporate

an integral double check valve with a balance port

connection which provides both an anti-compounding

or quick exhaust feature depending upon vehicle

application. The anti-compound feature is used when

these valves are used to control spring actuated

parking features.

R-7

™

Modula ting Valve

The R-7

™

Modulating Valve is used in dual circuit

brake systems and performs four functions; during

normal operation, it limits hold-off pressure to the

R-7

™

Valve

Spring Brake

Actuator

R-7

™

Valve

Park

Control

Valve

spring brakes, provides quick

release of air pressure from the

spring cavity of the spring brake

actuator allowing a fast application

of the spring brake actuators,

modulates spring brake actuator

application should a failure occur

in the service brake system and

prevents compounding of service

and spring forces.

R-12DC

Relay Valve

(Straight

trucks)

R-12P

™

Relay Valve

(0 crack pressure

for long wheelbase

trailers and dollies)

R-8P

™

Relay Valve

(0 crack pressure

for long wheelbase

trailers and dollies)

R-14

Relay Valve

(Anti-

compounding)

Relay Valves

R-12

Relay

Valve

R-6

™

Relay Valve

R-8

™

Relay Valve

(Anti-compounding,

frame or reservoir mounted)

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BENDIX MC-12 MODULATOR CONTROLLER ASSY Guide de dépannage Page 25

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