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Bendix

R-7

™

Modulating Valve

SD-03-4504

MOUNTING

SURFACE

DELIVERY

PORT (2)

SINGLE

CHECK

VALVE

INLET

EXHAUST

VALVE

CONTROL

PISTON

CONTROL

PORT

EXHAUST

INLET

VALVE

SPRING

OUTER SPRING

INNER SPRING

DOUBLE CHECK

VALVE

(SUPPLY PORT &

BALANCE PORT)

BALANCE

PISTON

INLET

VALVE

SEAT

DESCRIPTION

The Bendix

R‑7

™

modulating valve is used in conjunction

with a dual air brake system and spring brake actuators.

Typically the R‑7 modulating valve performs four functions:

1. Limits hold‑off pressure to the spring brake actuators.

2. Provides a quick release of air pressure from the spring

cavity of the spring brake actuator allowing a fast

application of the spring brake actuators. The valve

delivers air to the park brake quick release valve (or

relay) and also releases air in the control line to the

quick release valve (or relay).

3. Modulates spring brake actuator application should a

failure occur in the primary service brake system.

4. Prevents compounding of service and spring forces.

The valve has one 1/4" control, one 3/8" supply, one 1/4"

balance, two 3/8" delivery NPTF ports, and an exhaust

port protected by an exhaust diaphragm. The valve

incorporates two 13/32" holes for mounting.

Note for model year 2001 and later International

Trucks only: There is an inverted R‑7 valve, which

appears inverted from the other pictures in this document.

A standard R‑7 valve and an inverted R‑7 valve are not

interchangeable. See Figure 2 for a picture of an inverted

R-7 valve.

MOUNTING

HOLE (2)

EXHAUST

CONTROL

PORT

DELIVERY (2)

SUPPLY PORT

BALANCE PORT

FIGURE 1 ‑ EXTERIOR & SECTIONAL VIEW. INSET FIGURE 2 - INVERTED VIEW

MOUNTING

HOLE (2)

BALANCE

EXHAUST

CONTROL

SUPPLY

INVERTED R-7

™

VALVE

Some early versions

featured an adjusting screw

1 2 3 4 5 6

Resumo do Conteúdo

Página 1 - SD-03-4504

1Bendix® R-7™ Modulating ValveSD-03-4504MOUNTING SURFACEDELIVERY PORT (2)SINGLE CHECK VALVEINLET EXHAUST VALVECONTROL PISTONCONTROL PORTEXHAUSTINLET V

Página 2 - GENERAL SAFETY GUIDELINES

2GENERAL SAFETY GUIDELINESWARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONSTO AVOID PERSONAL INJURY OR DEATH:When working on or around a vehicle, the

Página 3 - ACTUATORS (FIGURE 3)

3BendixOPERATION - CHARGING SPRING BRAKE ACTUATORS (FIGURE 3)Air pressure used to control the spring brake actuators enters the Bendix® R‑7™ modulatin

Página 4 - (FIGURE 4)

4OPERATION - NORMAL SERVICE APPLICATION (FIGURE 4)When a service application is made by actuating the dual brake valve, air from the primary circuit i

Página 5 - IMPORTANT

5OPERATION - PARKING (FIGURE 7)When the handle of the parking control valve is placed in the “park” (exhaust) position, the modulating valve’s supply

Página 6 - Visit www.brake-school.com

6LEAKAGE TESTPlace the park control valve in the “release” position; using a soap solution, coat the exhaust and vent hole (in the proximity of the ad

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BENDIX BW1445 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sistema de solda BENDIX BW1445. BENDIX BW1445 User's Manual Manual do Utilizador

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