Troubleshooting guide

30
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Additional Control Valves
Inversion valves are air-operated control valves
and, unlike most control valves, are normally open,
(e.g. without control pressure, the supply is common to
the delivery). The inversion valve is closed by using air
pressure from another source and is primarily used in
emergency or parking brake systems which operate with
air from an isolated reservoir. The valve is also used
in interlocking and sequencing applications, where the
operation of components must take place in specifi c
sequence.
The Bendix
®
TR-3
™
inversion valve is used extensively
in actuator systems and in interlocking applications. A
specialized version of the TR-3
™
valve is available with an
internal channel connecting supply pressure to control,
typically with the external control port plugged.
The Bendix
®
SV-1
™
and SV-4
™
synchro valves are air
signal-operated, non-graduating (on/off) control valves
offered in a variety of pressure settings. They are used
to delay, or sequence, the action of other pneumatic
devices. When used in non-automatic applications they
control a separate air system circuit.
The Bendix SV-1 valve can also be used as an automatic
controller (when its supply and control are connected).
The valve will open, close and exhaust automatically as
the control and supply pressures rise or fall. The Bendix
SV-4 valve can be used in converter dolly air systems.
The Bendix
®
PP-5
™
push-pull control valve is a
pressure-sensitive, (on/off) control valve. It is used in
conjunction with vehicle torque converter systems,
engine speed control systems and some parking brake
systems. In addition to automatic exhaust and manual
control, the PP-5 valve employs a pilot air release feature
(interlock) which will allow the valve to be exhausted by
applying a low pressure signal from another control valve
to the PP-5 control port.
The Bendix
®
RD-3
™
push type control valve is a
manually-operated (on/off) control valve. The valve is
spring loaded and will remain in the exhaust (button out)
position. Constant manual force is required to cause the
valve to deliver air. The RD-3 control valve is primarily
used as an emergency brake release control valve.
Bendix
®
TR-3
™
Inversion
Valve
Bendix
®
SV-4
™
Trailer
Release
Valve
Bendix
®
SV-1
™
Synchro
Valve
The Control System: Additional Valves
Bendix
®
PP-5
™
Push-Pull
Control
Valve
Bendix
®
RD-3
™
Control
Valve
The Bendix
®
BVA-85
™
brake valve actuator enables
pre-trip brake inspections safely and easily with only one
person. It uses air from the trailer supply of the Bendix
®
MV-3
®
valve to keep the foot pedal applied at an accurate
85 psi service brake application.
This valve is also used as a work brake for unique systems
(e.g. to apply the service brakes for door interlock systems
for transit and school bus applications, refuse interlock
systems, and other severe service vehicle interlock
systems including paving and construction).
Bendix
®
BVA-85
™
Brake
Valve
Actuator