Operation & Maintenance Instruction
Page 4 of 24
August, 2003
4225-50, S.6
1.1.3
SERVICE PORTION
The Service Portion controls the flow of air from the auxiliary
reservoir to the brake cylinder during a service application
and the recharging of the auxiliary and emergency reservoirs,
and exhaust of brake cylinder during a release. The
accelerated release feature speeds up the recharge of brake
pipe during a release of a service application by the use of a
small amount of air from the emergency reservoir. The Service
Portion also includes a large capacity manual release valve.
This release valve offers the choice of exhausting only the
brake cylinder, exhausting the auxiliary reservoir and brake
cylinder, or exhausting both reservoirs and the brake cylinder.
Figure 2 shows the port identification on the service portion
bolting face. The ABDX-SS Service Portion has been tuned
to optimize the Quick Service function for short cars.
1.1.4
EMERGENCY PORTION
The Emergency Portion controls the flow of air from both
reservoirs to the brake cylinder during an emergency
application. An emergency application can be obtained at
any time regardless of the existing state of service application
or release, provided brake pipe pressure has not been reduced
below 45 psi prior to initiating an emergency. Emergency
brake cylinder air pressure is approximately 20% higher than
that obtained from a full service brake application. The
emergency brake cylinder pressure is developed in two
stages, thus reducing train slack action.
The Emergency Portion also contains the accelerated
application feature which accelerates the service buildup of
brake cylinder pressure throughout the train by locally venting
brake pipe at each car. The ABDX-SS Emergency Portion is
tuned to optimize this feature on short cars with less than 45
feet of brake pipe.
The emergency accelerated release feature speeds up the
recharge of brake pipe during a release of emergency
application by the use of air from the brake cylinder and
auxiliary reservoir.
2.0
OPERATION
Refer to Wabtec Publication 5062-19 for the operation of
ABDX-SS Control Valve.
3.0
MAINTENANCE SCHEDULE
IMPORTANT:
The ABDX-SS Control Valve should be
removed from the equipment arrangement, taken to the shop,
be completely disassembled, the parts cleaned, lubricated,
assembled, using
NEW
Wabtec Corporation
rubber parts
and other specified
NEW
Wabtec Corporation
parts. The valve
is then tested according to the following vehicle application
schedule, or more frequently if service conditions so indicate.
RECOMMENDED
FREQUENCY AT LEAST
TYPE OF APPLICATION
ONCE EVERY
FREIGHT
Not to exceed 12 YEARS
4.0
PARTS CATALOG INFORMATION
4.1
PARTS CATALOG
IMPORTANT:
When ordering replacement parts for the
ABDX-SS Control Valve, Part No. 664742, or any of its
component portions, refer to the current issue of Wabtec
Corporation Parts Catalog 3225-50, S.6.
NOTE:
The reference numbers used in this publication and
those used in the parts catalog may differ. Check the
descriptive parts name to be sure that the desired part is
ordered.
4.2
REPLACEMENT PARTS
IMPORTANT:
To obtain satisfactory operation and
reliability of the ABDX-SS Control Valve,
ONLY
Wabtec
Corporation replacement parts are to be used in the
maintenance of the ABDX-SS Control Valve. Commercially
available parts are unacceptable.
5.0
SAFETY PROCEDURES & WARNINGS
Regular car builder and/or owner-operating property and/or
shop safety procedures
MUST BE
followed when performing
any work on the ABDX-SS Control Valve and/or its component
parts.
The work area should be clean.
