BENDIX MC-12 MODULATOR CONTROLLER ASSY Guide de dépannage Page 28

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26
More info: visit www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Lever Operated Control Valves
Relay Valve
QR-1C
®
Quick
Release
Valve
QR-1C
®
Quick
Release Valve
Lever Operated Control Valves
The TW-2
and TH-3
valves are identical in
appearance (and similar to the TW-1
, TW-3
and
TW-4
) except they have two control valves housed in
a single body. These two valves differ by the internal
cammed control lever, which for the TW-2
control
valve has two lever positions, while the TH-3
valve
has three.
The TW-1
, TW-3
and TW-6
series control
valves are manually operated, non-modulating (on
- off) control valves used in a wide variety of control
functions. The TW-1
and TW-3
are dash-mounted,
lever-controlled valves.
The TW-4
is a manually operated momentary
non-modulating control valve commonly used in
conjunction with air starter systems.
A momentary push-type control valve, the TW-5
will deliver air pressure when the plunger is pushed
in and exhaust delivered air when the plunger load
is released. A typical application is for control of a
differential lock-out.
The TW-12
control valve is a manually operated,
non-graduating, on-off valve. It is extensively used
in hydraulic braking systems to control devices that
are responsible for the application and release of the
parking brakes, but is also used in air brake system
applications.
Stop Lamp Switches
The SL-4
and SL-5
stop lamp switches are pressure-
sensitive electro-pneumatic switches installed in the
service application system. They operate the vehicle
stop lamps by completing an electrical circuit and
lighting the stop lamps each time a brake application
is made.
TW-1
Valve
TW-2
,
TH-3
Valve
TW-3
Valve
SL-5
Switch
TW-11
Valve
TW-12
Valve
See page 14 for the DS-2
double check valve and
stop light switch.
Dual Function Quick Release Valve
The QR-1C
®
valve has a dual function. It works as
a quick release valve for rapid park brake actuation
and also provides anti-compounding, since its double
check valve prevents simultaneous service and
emergency spring brake applications.
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