Bendix Commercial Vehicle Systems SDS-9600 TRAILER DUMP VALVE - Manual

1
SD-03-4520
Bendix ® SDS-9600 ™ Trailer Suspension Dump Valve
DESCRIPTION
The SDS-9600 ™ trailer suspension dump valve is utilized
to assist spread axle trailers, with air suspension, negotiate
tight turns at low speeds by limiting torsion forces on the
rear trailer axle. These forces can damage tires, frames,
and suspension components.
When activated, the SDS-9600 ™ trailer suspension dump
valve exhausts (dumps) a portion of the air out of the rear
trailer axle suspension taking the weight off of that axle,
and transferring it to the forward trailer axle. The trailer
can then pivot on the forward trailer axle in a turn.
Maintaining a portion of the air in the rear axle reduces
damage to the air suspension, saves on suspension and
systems air, reduces time needed to re-infl ate the system
when required, and reduces tire chattering, all of which may
occur if all of the air is exhausted from the suspension. The
SDS-9600
™ trailer suspension dump valve then returns air
to the rear axle suspension upon driver input (deactivated)
or when vehicle speed is in excess of 10 mph.
The Bendix ® SDS-9600 ™ trailer suspension dump valve
is a pilot operated normally open three-way valve with
a high-capacity exhaust, inversion control, and delivery
pressure hold feature. The function of the valve is to apply
delivery pressure to the rear axle of a spread axle trailer
suspension, and then to exhaust the delivery pressure
through a high-capacity exhaust upon the input of a control
signal. Upon exhaust, an internal mechanism of the trailer
suspension dump valve stops the exhausting of air and
holds the delivery pressure at a minimal pressure.
Porting is as follows:
• (2) 3/8 inch NPT delivery ports
• (1) 1/4 inch NPT control port
• (1) 1/4 inch NPT supply port
• (1) 1/4 inch NPT reservoir
• (1) Exhaust port with Diaphragm
or optional 3/8 inch NPT port
FIGURE 1 - BENDIX ® SDS-9600 ™ TRAILER SUSPENSION DUMP VALVE PORT IDENTIFICATION
1/4" NPT
SUPPLY PORT
1/4" NPT
CONTROL
PORT
1/4" NPT
RESERVOIR
PORT
EXHAUST PORT
SHOWN WITH
DIAPHRAGM
3/8" NPT
DELIVERY PORT
3/8" NPT
DELIVERY PORT
EXHAUST PORT
SHOWN WITH
OPTIONAL SILENCER