BENDIX SS-1 SHUT OFF VALVE Manual
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Bendix
SS-1
Shut-Off Valve
®
™
CONTROL
PORT
VENT PORT
MOUNTING
HOLES
SUPPLY
PORT
FIGURE 1- SS-1
SHUT-OFF VALVE
™
DESCRIPTION
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The SS-1
shut-off valve (fi gure 1) is a pilot operated,
air controlled, on-off, non-graduating, non-exhausting
pneumatic control valve. The valve is primarily used to
delay, sequence, or control airfl ow from various devices in
the air brake system. It can be operated either in a pilot or
automatic mode using different air connection methods.
The SS-1
™
valve is a general purpose valve used in a
variety of applications on trucks, buses, tractors, trailers
and converter dollies. It is offered in a variety of pressure
settings to accommodate applications where automatic
operation is required. The most common application of
™
the SS-1
valve is in the tractor protection system of a
truck tractor.
Important Note: The SS-1
application specifi c due to its pressure settings. It is
therefore important to use the proper part number
when replacement is required. IN ADDITION: The
SS-1
shut-off valve and SV-1
™
identical in appearance and similar in operation but
have substantial internal differences and must not
be confused or used interchangeably. The SV-1
synchro valve incorporates an internal exhaust passage
through its piston, which allows delivery pressure to
be vented to atmosphere while the SS-1
Refer to Service Data Sheet, SD-03-4020, for more
information on the SV-1
Sheets can be obtained by calling 1-800-AIR-BRAKE
or by visiting www.bendix.com on the Internet.
CONTROL PORT
CAP NUT
DELIVERY
PORT
SUPPLY PORT
CAP NUT
™
shut-off valve is
synchro valves are
™
™
does not.
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synchro valve. Service Data
PISTON
PISTON O-RING
VENT PLUG WITH
1/8" P.T. VENT
MOUNTING
HOLE
INLET VALVE
CAP NUT O-RING
Two .28 inch mounting holes are provided in the die cast
zinc body for panel or frame mounting. Two steel hex cap
nuts at the ends of the cylindrical valve body retain the
internal components. All air connection ports contain pipe
threads. Lettering embossed in the valve body identifi es
two of the four ports in the valve. Refer to the chart below
and fi gure 1.
Air Connection
Supply
Delivery
Control
Vent
IMPORTANT: A vented, socket head vent plug is
installed in some SS-1
check valve should be installed in the threaded vent
port when the SS-1
in unprotected environments. See Figure 2.
™
Note: Either style may be installed in the SS-1
FIGURE 2 - EXHAUST CHECK VALVE STYLES
1/4" P.T.
CONTROL PORT
CAP NUT O-RING
PISTON RETURN
PISTON O-RING
INLET VALVE
1/4" P.T.
SUPPLY PORT
Body Ident.
Thread Size
SUP
1/4" P.T.
DEL
1/4" P.T.
NONE
1/4" P.T.
NONE
1/8" P.T.
™
valves, however, an exhaust
™
valve is mounted outside the cab
1/8" PIPE THREAD
SPRING
1/4" P.T.
DELIVERY
PORT
SPRING
™
valve
1