BENDIX BW2271 Uživatelský manuál stáhnout pdf

Bendix

SR-7

Spring Brake Modulating Valve

SD-03-9043

DESCRIPTION

The Bendix

SR-7

spring brake modulating valve is used

in conjunction with a dual air brake system and spring brake

actuator and performs the following functions:

1. Provides a rapid application of the spring brake actuator

when parking.

2. Modulates the spring brake actuator application using

the dual brake valve should a primary failure occur in

the service brake system.

3. Prevents compounding of service and spring forces.

The valve has one park control, one service control, one

supply, one balance, four delivery NPTF ports, and an

exhaust port protected by an exhaust diaphragm. The

valve incorporates two mounting studs for mounting the

valve to the frame rail or cross member (where applicable).

MOUNTING

STUDS (2)

EXHAUST

CONTROL

PORT

DELIVERY

SUPPLY PORT

BALANCE

PORT

FIGURE 1 - EXTERIOR VIEW

EXHAUST

DELIVERY

4-1

PARK CONTROL

(FROM DASH VALVE)

PIPE PLUG

(INCLUDED IN QUICK

RELEASE VALVE

APPLICATIONS)

1 2 3 4 5 6 7 8

Shrnutí obsahu

Strany 1 - SD-03-9043

1Bendix® SR-7® Spring Brake Modulating ValveSD-03-9043DESCRIPTIONThe Bendix® SR-7® spring brake modulating valve is used in conjunction with a dual ai

Strany 2 - OPERATION

2OPERATIONThe operation guidelines shown in this manual represent the relay valve based Bendix® SR-7® (refer to system schematic shown in ﬁ gure 3).

Strany 3 - PP-DC PARKING CONTROL

3PP-DC®VALVESYSTEM FOR A 4X2 OR 6X4STRAIGHT TRUCK WITHPP-DC PARKING CONTROL®FIGURE 3 - SYSTEM SCHEMATIC WITH PP-DC® PARK CONTROLFIGURE 4 - SYSTEM SCHE

Strany 4 - 107 PSI (FIGURE 6)

4CHARGING SPRING BRAKE ACTUATORS BELOW 107 PSI (FIGURE 5)With the air brake system charged and the parking brakes released (by pushing the dash valve

Strany 5 - PARKING (FIGURE 8)

5NORMAL SERVICE APPLICATION (FIGURE 7)During a service brake application, the valve remains in the lap position. The Bendix® SR-7® valve monitors the

Strany 6 - PRIMARY CIRCUIT (FIGURE 9)

6SERVICE APPLICATION WITH LOSS OF AIR IN PRIMARY CIRCUIT (FIGURE 9)With the parking brakes released (dash valve button in) and the absence of air in t

Strany 7 - OPERATING TEST

7ANTI COMPOUNDING (FIGURE 11)The Bendix® SR-7® valve provides anti-compounding of the service and spring brake forces. When the park brakes are actua

Strany 8

8LEAKAGE TESTPlace the park control valve in the “release” position; using a soap solution, coat all ports including the exhaust port. A 1" bubb