BENDIX BW1589 Manuel d'utilisateur télécharger pdf

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

speciﬁ 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 identiﬁ 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 ﬂ 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)

1 2 3 4 5 6 7 8

Résumé du contenu

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

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BENDIX BW1589 Manuel d'utilisateur