User Manual

1
SD-03-2205
DESCRIPTION
The Bendix
®
SC-3
™
in-line single check valve is a device
placed in an air line to allow air ow in one direction only
and to prevent ow of air in the reverse direction.
The two types of SC-3
™
in-line single check valves are:
1. The wafer-style type (Figure 2).
2. The ball type (Figure 3).
An arrow indicating the direction of air ow is found on the
body of the valve.
OPERATION
Air ow in the normal direction moves the check valve
from its seat, and the ow is unobstructed. Flow in the
reverse direction is prevented by the seating of the ball or
wafer-type disc, which is caused by a drop in up-stream
air pressure and assisted by the spring.
PREVENTATIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A
warranty may be voided if intrusive maintenance is
performed during the warranty period.
No two vehicles operate under identical conditions; as
a result, maintenance intervals may vary. Experience is
a valuable guide in determining the best maintenance
interval for air brake system components. At a minimum,
the SC-3
™
valve should be inspected every 6 months or
1500 operating hours, whichever comes rst, for proper
operation. Should the SC-3
™
valve not meet the elements
of the operational tests noted in this document, further
investigation and service of the valve may be required.
Replace any check valves leaking or showing signs of
wear or deterioration.
Bendix
®
SC-3
™
In-Line Single Check Valves
FIGURE 1 - SC-3
™
SINGLE CHECK VALVES
outlet
inlet
spring
outlet
ball
FIGURE 3 - SC-3
™
ANGLE CHECK VALVE: BALL TYPE
(EXTERIOR AND CROSS-SECTIONAL VIEWS)
FIGURE 2 - SC-3
™
SINGLE CHECK VALVE: WAFER-TYPE
(EXTERIOR AND CROSS-SECTIONAL VIEWS)
(one sc-3
™
valve model
features
this 1/16”
pipe plug)
inlet
inlet
outlet
outlet
spring
wafer-type
check valve