Bendix-commercial-vehicle-systems SR-1 SPRING BRAKE VALVE User Manual

Browse online or download User Manual for Equipment Bendix-commercial-vehicle-systems SR-1 SPRING BRAKE VALVE. Bendix Commercial Vehicle Systems SR-1 SPRING BRAKE VALVE User Manual

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1
®
SD-03-4508
Bendix
®
SR-1
Spring Brake Valve
1/4 P.T.
RES. #1
1/4 P.T.
DELIVERY
1/4 P.T.
SUPPLY
FIGURE 1 - BENDIX
®
SR-1
VALVE EXTERIOR AND SECTIONAL VIEW
1/4 P.T.
CONTROL
DESCRIPTION:
The Bendix
®
SR-1
spring brake valve is used in dual
or “split” air brake systems equipped with spring brake
actuators. The function of the SR-1 valve is to supply a
speci c, limited hold-off pressure to the spring brakes, and
in the event of the loss of No. 1 service air pressure, to
modulate the spring brakes through the use of the service
brake valve.
The valve has four identi ed 1/4" N.P.T.F. ports and a
diaphragm protected exhaust port. Two 5/16" diameter
holes are provided in the integral mounting bracket of the
valve body. The SR-1 valve must be mounted with the
exhaust port down toward the road surface.
OPERATION - INITIAL AIR SYSTEM CHARGE
Air owing from the No. 1 reservoir only enters the reservoir
port of the SR-1 valve. This air remains under piston A as
system pressure builds. With No. 1 reservoir pressure
below approximately 55 P.S.I. the spring above piston A
forces it into contact with inlet and exhaust valve A causing
the exhaust to seal and the inlet to open. Refer to Figure 3.
With air system pressure above approximately 55 P.S.I. in
No. 1 & 2 service reservoirs, piston A has moved against
the force of the spring above it, allowing the inlet of valve A
to close and opening the hollow exhaust passage through
piston A. Refer to Figure 4.
PISTON SPRING
(14)
O-RING
(LARGE)
(18)
PISTON SPRINGS
(14)
COVER (13)
PISTON (15)
PISTON O-RINGS
(16)
VALVE (12)
VALVE SPRING (11)
VALVE STOP (10)
O-RING (9)
CAP NUT (8)
PISTON (17)
O-RING
(SMALL) (19)
BODY
CHECK
VALVE SPRING (2)
PIPE PLUG
(1)
CHECK
VALVE (4)
EXHAUST
COVER (5)
DIAPHRAGM
(6)
INLET &
EXHAUST
VALVE (7)
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Summary of Contents

Page 1 - Spring Brake Valve

1®SD-03-4508Bendix® SR-1™ Spring Brake Valve1/4 P.T.RES. #11/4 P.T. DELIVERY1/4 P.T. SUPPLYFIGURE 1 - BENDIX® SR-1™ VALVE EXTERIOR AND SECTIONAL VIEW

Page 2 - EXHAUST

2FIGURE 2 - SYSTEM SCHEMATICFIGURE 3 - RESERVOIRS CHARGING - BELOW 55 P.S.I.PARK CONTROL VALVEMODULATORSUPPLY#1 SERVICE RESERVOIR#2 SERVICE RESERVOIRD

Page 3 - ACTUATORS ABOVE 95 PSI

3FIGURE 5 - PARKING BRAKE SUPPLY DELIVERY LESS THAN 95 P.S.I.FIGURE 4 - RESERVOIRS CHARGING - ABOVE 55 P.S.I.OPERATION - CHARGING SPRING BRAKE ACTUATO

Page 4 - OF NO. 2 RESERVOIR PRESSURE

4FIGURE 7 - NORMAL SERVICE APPLICATIONFIGURE 6 - PARKING BRAKE SUPPLY DELIVERY EQUAL TO OR GREATER THAN 95 P.S.I.*Note: Other spring brake hold-off p

Page 5 - OF NO. 1 RESERVOIR PRESSURE

5OPERATION - SERVICE APPLICATION WITH LOSS OF NO. 1 RESERVOIR PRESSUREIf air pressure in the No. 1 service reservoir falls below approximately 55 P.S.

Page 6 - OPERATION - PARKING

6OPERATION - PARKINGIf both systems #1 and #2 are intact and the park control valve is placed in the “park” or exhaust position, the Bendix® SR-1™ val

Page 7

7LEAKAGE CHECKWith the air system fully charged and the parking control valve in the “release” position, coat the exhaust port and around the valve co

Page 8

8BW1589 © 2012 Bendix Commercial Vehicle Systems Company LLC, a member of the Knorr-Bremse Group • 5/2012 • All Rights Reserved

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