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Bendix

R-8

™

Relay Valve

SD-03-1061

FIGURE 1 - EXTERIOR

FIGURE 2 - SECTIONAL

DESCRIPTION

The relay valve in an air brake system functions as a relay

station to speed up the application and release of the brakes.

The valve is normally mounted in the proximity to the

chamber it serves. The valve operates as a remote controlled

brake valve that delivers or releases air to the chambers in

response to the control air delivered to it from the control

point.

The R-8

™

relay valve is designed for either frame or reservoir

mounting. Remote mounted valves generally have one or

two 3/4" supply ports. The reservoir mounted configuration

has an additional 3/4" port through the body mounting flange.

Three delivery ports with various size pipe threads are

provided for piping versatility. A single 1/4" service port is

located in the cover which can be rotated to 90° increments.

The R-8

™

valve incorporates a unique, quick release and

anti-compounding feature located above the service port in

the cover. With the anti-compounding feature not in use,

an exhaust cover is installed. When the anti-compounding

feature is used, removal of the exhaust cover exposes a

1/8" pipe thread balance port. All ports on the valve are

identified.

GENERAL OPERATION

The rapid reaction of the R-8

™

valve to changes in control

pressures is in part due to the relatively small volume of air

required between the valve cover and the relay piston. The

area of the relay piston and the presence of the quick release,

anti-compound feature also contribute greatly to the fast

application and release of the emergency and parking brakes.

APPLYING

Air pressure entering the service port moves the flexible

diaphragm, closing off the exhaust passage of the quick

release. Air also flows around the edge of the diaphragm

and into the cavity between the cover and the top of the

relay piston. Air pressure acting on the surface of the piston

forces it down. The exhaust valve seat moves down with the

piston and seats on the inner or exhaust portion of the inlet

and exhaust valve, sealing off the exhaust passage. At the

same time the outer or inlet port of the inlet and exhaust

valve moves off its seat, permitting supply air to flow from

the reservoir past the open inlet valve and out the delivery

port.

1/4 P.T.

SERVICE

1/2 P.T.

DELIVERY

3/4 P.T.

SUPPLY

EXHAUST

COVER

ASSY.

DIAPHRAGM

RELAY

PISTON

ASSY.

SCREW

EXHAUST COVER

QUICK

RELEASE

DIAPHRAGM

CAP

NUT

SEALING

RING

O-RING

SCREW

WASHER

O-RING

INLET &

EXHAUST

VALVE

SEALING

RING

PISTON

RETURN

SPRING

1 2 3 4

Résumé du contenu

Page 1 - Relay Valve

1®Bendix® R-8™ Relay ValveSD-03-1061FIGURE 1 - EXTERIORFIGURE 2 - SECTIONALDESCRIPTIONThe relay valve in an air brake system functions as a relaystati

Page 2 - SERVICE AND PARK APPLICATION)

2BALANCEDThe air pressure being delivered by the open inlet valve alsois effective on the bottom area of the relay piston. When thisdelivery air press

Page 3

3(NOTE: The standard R-8™ valve does not employ a pistonreturn spring. However, it is optionally used in somevalues.)3. Remove the sealing ring from t

Page 4 - PERSONAL INJURY OR DEATH:

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BENDIX BW1569 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Accessoires et composants de véhicules automobiles BENDIX BW1569. BENDIX BW1569 User's Manual Manuel d'utilisatio

Résumé du contenu

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